Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2015	Nov. 06, 2015
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	SCOR
Entity Registrant Name	COMSCORE, INC.
Entity Central Index Key	0001158172
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		38,954,390

CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 141,829	$ 43,015
Accounts receivable, net of allowances of $2,458 and $2,079, respectively	77,830	98,185
Prepaid expenses and other current assets	23,001	11,015
Deferred tax assets	20,983	20,976
Assets held for sale	0	5,692
Total current assets	263,643	178,883
Property and equipment, net	45,482	42,365
Other non-current assets	952	1,017
Long-term deferred tax assets	12,678	12,369
Intangible assets, net	111,330	15,793
Goodwill	111,563	103,525
Total assets	545,648	353,952
Current liabilities:
Accounts payable	6,597	3,421
Accrued expenses	28,925	37,212
Deferred revenues	78,413	92,013
Deferred rent	1,378	1,738
Capital lease obligations	16,380	13,353
Liabilities held for sale	0	3,873
Total current liabilities	131,693	151,610
Deferred rent, long-term	9,041	9,738
Deferred revenue, long-term	516	2,063
Deferred tax liabilities, long-term	1,089	1,182
Capital lease obligations, long-term	14,673	13,072
Other long-term liabilities	977	1,022
Total liabilities	157,989	178,687
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value per share; 5,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value per share; 100,000,000 shares authorized; 41,042,178 shares issued and 38,953,054 outstanding as of September 30, 2015 and 35,919,340 shares issued and 34,174,466 shares outstanding at December 31, 2014, respectively	40	36
Additional paid-in capital	610,599	324,176
Accumulated other comprehensive (loss) income	(10,075)	(5,591)
Accumulated deficit	(104,227)	(93,076)
Treasury stock, at cost, 2,089,124 and 1,744,874 shares as of September 30, 2015 and December 31, 2014, respectively	(108,678)	(50,280)
Total stockholders’ equity	387,659	175,265
Total liabilities and stockholders’ equity	$ 545,648	$ 353,952

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2015	Dec. 31, 2014
Statement Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 0	$ 2,079
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock,shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	0	35,919,340
Common stock, shares outstanding (in shares)	0	34,174,466
Total number of shares repurchased	1,265,345	1,744,874

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $)

3 Months Ended

9 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2015

Sep. 30, 2014

Statement Consolidated Statements Of Operations And Comprehensive Income [Abstract]

Revenues

$ 92,405,000

$ 82,136,000

$ 271,148,000

$ 239,048,000

Cost of revenues (excludes amortization of intangible assets)

30,859,000

^[1]

24,491,000

^[1]

84,259,000

^[1]

71,164,000

^[1]

Selling and marketing

23,177,000

^[1]

26,125,000

^[1]

75,376,000

^[1]

78,791,000

^[1]

Research and development

15,030,000

^[1]

13,784,000

^[1]

49,937,000

^[1]

39,192,000

^[1]

General and administrative

17,046,000

^[1]

14,966,000

^[1]

57,041,000

^[1]

42,952,000

^[1]

Amortization of intangible assets

4,220,000

1,912,000

9,904,000

5,786,000

Impairment of Intangible Assets, Finite-lived

6,942,000

Loss on asset disposition

5,226,000

Settlement of litigation, net

(170,000)

(80,000)

(830,000)

2,780,000

Total expenses from operations

90,162,000

88,140,000

280,913,000

247,607,000

Income (loss) from operations

2,243,000

(6,004,000)

(9,765,000)

(8,559,000)

Interest and other expense, net

(396,000)

(382,000)

(1,181,000)

(889,000)

(Loss) gain from foreign currency

(926,000)

570,000

(529,000)

253,000

Income (loss) before income tax provision

921,000

(5,816,000)

(11,475,000)

(9,195,000)

Income tax benefit

40,000

2,555,000

324,000

1,952,000

Net income (loss)

961,000

(3,261,000)

(11,151,000)

(7,243,000)

Net income (loss) available to common stockholders per common share:

Basic (in dollars per share)

$ 0.02

$ (0.10)

$ (0.30)

$ (0.22)

Diluted (in dollars per share)

$ 0.02

$ (0.10)

$ (0.30)

$ (0.22)

Weighted-average number of shares used in per share calculation - common stock:

Basic (in shares)

39,174,438

33,502,533

37,586,329

33,550,933

Diluted (in shares)

39,822,723

33,502,533

37,586,329

33,550,933

Comprehensive loss:

Net loss

961,000

(3,261,000)

(11,151,000)

(7,243,000)

Other comprehensive income (loss):

Foreign currency cumulative translation adjustment

(1,227,000)

(4,309,000)

(4,484,000)

(4,379,000)

Total comprehensive loss

$ (266,000)

$ (7,570,000)

$ (15,635,000)

$ (11,622,000)

[1]	Amortization of stock-based compensation is included in the line items above as follows: Cost of revenues $1,110 $944 $4,434 $2,671 Selling and marketing $2,542 $3,128$8,176 $9,191 Research and development $1,307 $999$4,531 $2,580 General and administrative $3,686$5,088 $21,876 $12,000

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization of stock-based compensation	$ 1,110	$ 944	$ 4,434	$ 2,671
Selling and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization of stock-based compensation	2,542	3,128	8,176	9,191
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization of stock-based compensation	1,307	999	4,531	2,580
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization of stock-based compensation	$ 3,686	$ 5,088	$ 21,876	$ 12,000

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Stockholders' Deficit [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2013	$ 198,802	$ 36	$ 293,322	$ 1,726	$ (83,173)	$ (13,109)
Balance, shares at Dec. 31, 2013		35,216,071
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,243)				(7,243)
Foreign currency translation adjustment	(4,379)			(4,379)
Exercise of common stock options (in shares)		21,742
Exercise of common stock options	81		81
Issuance of restricted stock, shares		228,084
Issuance of restricted stock	0	0	0
Restricted stock cancelled, shares		(29,846)
Restricted stock units vested, shares		421,238
Common stock received for tax withholding, shares		(443,699)
Common stock received for tax withholding	(14,458)		(14,458)
Repurchase of common stock, shares	(1,253,672)	(1,253,672)
Repurchase of common stock	(36,886)					(36,886)
Excess tax benefits from stock based compensation, net	2,229
Stock based compensation	26,481		26,481
Balance at Sep. 30, 2014	164,627	36	307,655	(2,653)	(90,416)	(49,995)
Balance, shares at Sep. 30, 2014		34,159,918
Balance at Dec. 31, 2014	175,265	36	324,176	(5,591)	(93,076)	(50,280)
Balance, shares at Dec. 31, 2014		34,174,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(11,151)				(11,151)
Foreign currency translation adjustment	(4,484)			(4,484)
Exercise of common stock options (in shares)	276,064	276,064
Exercise of common stock options	11,621		11,621
Issuance of restricted stock, shares		189,708
Issuance of restricted stock		0	0
Issuance of common stock for acquisitions (shares)		4,438,353
Issuance of common stock for acquisitions	224,863	4	224,859
Reissuance of treasury stock (shares)		1,605,330
Reissuance of treasury stock	82,543		35,025			47,518
Restricted stock cancelled, shares		(10,263)
Restricted stock units vested, shares		754,491
Stock Issued During Period, Value, Restricted Stock Award, Vested	0	1
Common stock received for tax withholding, shares		(525,515)
Common stock received for tax withholding	(26,905)		(26,904)
Repurchase of common stock, shares	(1,949,580)	(1,949,580)
Repurchase of common stock	(105,916)					(105,916)
Amortization of stock-based compensation	41,823		41,823
Balance at Sep. 30, 2015	$ 387,659	$ 40	$ 610,599	$ (10,075)	$ (104,227)	$ (108,678)
Balance, shares at Sep. 30, 2015		38,953,054

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net loss
Net loss	$ (11,151)	$ (7,243)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	15,760	13,185
Amortization of intangible assets	9,904	5,786
Impairment of Intangible Assets, Finite-lived	0	6,942
Provision for bad debts	2,070	2,223
Stock-based compensation	39,017	26,442
Amortization of deferred rent	(1,435)	(974)
Deferred tax benefit	(167)	(6,113)
Loss on asset disposition	5,226	153
Changes in operating assets and liabilities:
Accounts receivable	16,841	6,084
Prepaid expenses and other assets	(11,812)	(14,736)
Accounts payable, accrued expenses, and other liabilities	(4,532)	16,487
Deferred revenues	(12,307)	(6,252)
Deferred rent	426	36
Net cash provided by operating activities	47,840	42,020
Investing activities
Acquisitions, net of cash acquired	(10,117)	(4,043)
Purchase of property and equipment	(3,218)	(6,562)
Cash paid for disposition of business	(2,535)	0
Net cash used in investing activities	(15,870)	(10,605)
Financing activities
Proceeds from the issuance of common stock	204,741	0
Proceeds from the exercise of common stock options	11,621	81
Repurchase of common stock (withholding taxes)	(26,905)	(14,458)
Repurchase of common stock (treasury shares)	(105,916)	(36,886)
Excess tax benefits from stock-based compensation	0	2,229
Principal payments on capital lease obligations	(11,894)	(8,706)
Equity issuance costs	(3,356)	0
Net cash provided by (used in) financing activities	68,291	(57,740)
Effect of exchange rate changes on cash	(1,447)	(1,860)
Net increase (decrease) in cash and cash equivalents	98,814	(28,185)
Cash and cash equivalents at beginning of period	43,015	67,795
Cash and cash equivalents at end of period	141,829	39,610
Supplemental cash flow disclosures
Interest paid	1,184	943
Net income taxes paid	1,567	955
Supplemental noncash investing and financing activities
Stock issued in connection with acquisition	106,025	0
Capital lease obligations incurred	16,521	10,895
Accrued capital expenditures	$ 2,380	$ 1,573

Organization

9 Months Ended

Sep. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization



1.	Organization

comScore, Inc. (the “Company”), a Delaware corporation incorporated in August 1999, provides digital media analytics that enables its customers to make well-informed, data-driven decisions to effectively manage their business, build successful digital strategies and tactics, and optimize their marketing and advertising investments. The Company is a technology-driven company that measures what people do as they navigate the digital world across multiple technology platforms including personal computers, smartphones, tablets, televisions and interact with digital media, including websites, apps, video programming and advertising. The Company aspires to measure all digital interactions across all major digital platforms on a global basis.

The Company's products and services provide its customers with deep and actionable insight into consumer behavior including objective, detailed information about consumer usage of digital content and advertising coupled with information on consumer demographic characteristics, attitudes, lifestyles and offline behavior. The Company combines its proprietary data with its clients’ own data and data from partners to provide valuable digital media analytics. The Company delivers on-demand and real-time products and services through a scalable Software-as-Service delivery model, which supports both Company branded products and also partner products integrating the Company's data and services.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References+ Details

Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies



2.	Summary of Significant Accounting Policies

Basis of Presentation and Consolidation

The accompanying interim consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and accounts have been eliminated upon consolidation. The Company consolidates investments where it has a controlling financial interest. The usual condition for controlling financial interest is ownership of a majority of the voting interest and, therefore, as a general rule, ownership, directly or indirectly, of more than 50% of the outstanding voting shares is a condition indicating consolidation. All of the Company's subsidiaries are wholly owned.

Unaudited Interim Financial Information

The consolidated interim financial statements included in this quarterly report on Form 10-Q have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in consolidated interim financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures contained in this quarterly report comply with the requirements of Section 13(a) of the Securities Exchange Act of 1934 (the “Exchange Act”), as amended, for a quarterly report on Form 10-Q and are adequate to make the information presented not misleading. The consolidated interim financial statements included herein, reflect all adjustments (consisting of normal recurring adjustments) which are, in the opinion of management, necessary for a fair presentation of the financial position, results of operations and cash flows for the interim periods presented. These consolidated interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, filed February 20, 2015 with the SEC. The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of the results to be anticipated for the entire year ending December 31, 2015 or thereafter. All references to September 30, 2015 and 2014 or to the three and nine months ended September 30, 2015 and 2014 in the notes to the consolidated interim financial statements are unaudited.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the reported amounts of revenue and expense during the reporting periods. Significant estimates and assumptions are inherent in the analysis and the measurement of deferred tax assets, the identification and quantification of income tax liabilities due to uncertain tax positions, the valuation and recoverability of intangible assets and goodwill, the collectability of accounts receivable and the allowance for doubtful accounts and evaluating the estimates used in accounting for nonmonetary transactions. The Company bases its estimates on historical experience and assumptions that it believes are reasonable. Actual results could differ from those estimates.

Fair Value Measurements

The Company evaluates the fair value of certain assets and liabilities using the fair value hierarchy. Fair value is an exit price representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the Company applies the three-tier value hierarchy which prioritizes the inputs used in measuring fair value as follows:

Level 1 — observable inputs such as quoted prices in active markets;

Level 2 — inputs other than the quoted prices in active markets that are observable either directly or indirectly;

Level 3 — unobservable inputs of which there is little or no market data, which require the Company to develop its own assumptions.

The Company does not currently have any assets or liabilities that are measured at fair value on a recurring basis. However, cash equivalents, accounts receivable, prepaid expenses and other assets, accounts payable, accrued expenses, deferred revenue, deferred rent and capital lease obligations reported in the consolidated balance sheets equal or approximate their respective fair values because of their short term nature.

Cash and Cash Equivalents and Investments

Cash and cash equivalents consist of highly liquid investments with an original maturity of three months or less at the time of purchase. Cash and cash equivalents are maintained with several financial institutions. The combined account balances held on deposit at each institution typically exceed FDIC insurance coverage and, as a result, there is a concentration of credit risk related to amounts on deposit in excess of FDIC insurance coverage. The Company believes the risk is not significant.

Interest income on investments and excess cash balances was a nominal amount for the three and nine months ended September 30, 2015 and 2014.

Accounts Receivable

Accounts receivable are recorded at the invoiced amount and are non-interest bearing. The Company generally grants uncollateralized credit terms to its customers and maintains an allowance for doubtful accounts to reserve for potentially uncollectible receivables. Allowances are based on management’s judgment, which considers historical experience and specific knowledge of accounts where collectability may not be probable. The Company makes provisions based on historical bad debt experience, a specific review of all significant outstanding invoices and an assessment of general economic conditions. If the financial condition of a customer deteriorates, resulting in an impairment of its ability to make payments, additional allowances may be required. Included within accounts receivable are unbilled accounts receivable, which relate to situations in which the Company has recognized revenue for services performed prior to invoicing a customer, but for which we have the legal right to invoice the customer. Typically, unbilled accounts receivable are invoiced in the following period.

Impairment of Long-Lived Assets

The Company’s long-lived assets primarily consist of property and equipment and intangible assets. The Company evaluates its long-lived assets for impairment whenever events or changes in circumstances indicate the carrying value of such assets may not be recoverable. If an indication of impairment is present, the Company compares the estimated undiscounted future cash flows to be generated by the asset to its carrying amount. Recoverability measurement and estimation of undiscounted cash flows are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. If the undiscounted future cash flows are less than the carrying amount of the asset group, the Company records an impairment loss equal to the excess of the asset group’s carrying amount over its fair value. The fair value is determined based on valuation techniques such as a comparison to fair values of similar assets or using a discounted cash flow analysis. Although the Company believes that the carrying values of its long-lived assets are appropriately stated, changes in strategy or market conditions or significant technological developments could significantly impact these judgments and require adjustments to recorded asset balances. During the three and nine months ended September 30, 2015, there were no impairment charges recognized. During the three and nine months ended September 30, 2014, the Company recorded an impairment charge of $6.9 million related to certain intangible assets related to its mobile operator analytics division, which was disposed of in May 2015, refer to Footnote 4, Asset Dispositions and Footnote 5, Goodwill and Intangible assets.

Revenue Recognition

The Company recognizes revenues when the following fundamental criteria are met: (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or the services have been rendered, (iii) the fee is fixed or determinable, and (iv) collection of the resulting receivable is reasonably assured.

The Company generates revenues by providing access to the Company’s online database or delivering information obtained from the database, usually in the form of periodic reports. Revenues are typically recognized on a straight-line basis over the period in which access to data or reports is provided, which generally ranges from three to twenty-four months. Sales taxes remitted to government authorities are recorded on a net basis.

Revenues are also generated through survey services under contracts ranging in term from two months to one year. Survey services consist of survey and questionnaire design with subsequent data collection, analysis and reporting. At the outset of an arrangement, total arrangement consideration is allocated between the development of the survey questionnaire and subsequent data collection, analysis and reporting services based on relative selling price. Revenue allocated to the survey questionnaire is recognized when it is delivered and revenue allocated to the data collection, analysis and reporting services is recognized on a straight-line basis over the estimated data collection period once the survey or questionnaire design has been delivered. Any change in the estimated data collection period results in an adjustment to revenues recognized in future periods.

Certain of the Company’s arrangements contain multiple elements, consisting of the various services the Company offers. Multiple element arrangements typically consist of either subscriptions to multiple online products or a subscription to the Company’s online database combined with customized services. The Company accounts for these arrangements in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2009-13, Multiple Deliverable Revenue Arrangements, which requires the Company to allocate arrangement consideration at the inception of an arrangement to all deliverables, if they represent a separate unit of accounting, based on their relative selling prices. The guidance establishes a hierarchy to determine the selling price to be used for allocating arrangement consideration to deliverables: (i) vendor-specific objective evidence of fair value (“VSOE”), (ii) third-party evidence of selling price (“TPE”) if VSOE is not available, or (iii) an estimated selling price (“ESP”) if neither VSOE nor TPE are available. VSOE generally exists only when the Company sells the deliverable separately and is the price actually charged by the Company for that deliverable on a stand-alone basis. ESP reflects the Company’s estimate of what the selling price of a deliverable would be if it was sold regularly on a stand-alone basis.

The Company has concluded it generally does not have VSOE for its arrangements, and TPE is generally not available because the Company’s service offerings are highly differentiated and the Company is unable to obtain reliable information on the products and pricing practices of the Company’s competitors. As such, ESP is generally used to allocate the total arrangement consideration at the arrangement inception based on each element’s relative selling price.

The Company’s process for determining ESP involves management’s judgments based on multiple factors that may vary depending upon the unique facts and circumstances related to each product suite and deliverable. The Company determines ESP by considering several external and internal factors including, but not limited to, current pricing practices, pricing concentrations such as industry, channel, customer class or geography, internal costs and market penetration of a product or service. The total arrangement consideration is allocated to each of the elements based on the relative selling price. If the ESP is determined as a range of selling prices, the mid-point of the range is used in the relative-selling-price method. Once the total arrangement consideration has been allocated to each deliverable based on the relative allocation of the arrangement fee, the Company commences revenue recognition for each deliverable on a stand-alone basis as the data or service is delivered. ESP will be analyzed on an annual basis or more frequently if management deems it likely that changes in the estimated selling prices have occurred.

Generally, contracts are non-refundable and non-cancellable. In the event a portion of a contract is refundable, revenue recognition is delayed until the refund provisions lapse. A limited number of customers have the right to cancel their contracts by providing a written notice of cancellation. In the event that a customer cancels its contract, the customer is not entitled to a refund for prior services, and will be charged for costs incurred plus services performed up to the cancellation date.

Advance payments are recorded as deferred revenues until services are delivered or obligations are met and revenue can be recognized. Deferred revenues represent the excess of amounts invoiced over amounts recognized as revenues.

Multiple contracts with a single counterparty that are negotiated simultaneously and are considered contemporaneous are accounted for as one arrangement. If there are multiple contracts with one counterparty that are deemed independent of one another, they are accounted for as separate arrangements.

The Company accounts for nonmonetary transactions under Accounting Standards Codification ("ASC") 845, Nonmonetary Transactions. Nonmonetary transactions with commercial substance are recorded at the estimated fair value of assets surrendered including cash, if cash is less than 25% of the fair value of the overall exchange, unless the fair value of the assets received is more clearly evident, in which case the fair value of the assets received is used to estimate fair value for the exchange.

During the three and nine months ended September 30, 2015, the Company recognized $9.1 million and $23.7 million of revenue related to nonmonetary transactions, respectively. During the three and nine months ended September 30, 2015, the Company recognized $5.1 million and $14.3 million, respectively, in expense related to nonmonetary transactions, respectively.

During the three and nine months ended September 30, 2014, the Company recognized $4.6 million and $8.6 million of revenue related to nonmonetary transactions, respectively. During the three and nine months ended September 30, 2014, the Company recognized $2.9 million and $7.0 million, respectively, in expense related to nonmonetary transactions, respectively.

Due to timing differences in the delivery and receipt of the respective assets exchanged, expense recognized in each period is different from the amount of revenue recognized.

Refer to Footnote 12, Related Party Transactions, for discussion of a nonmonetary transaction with a related party.

Stock-Based Compensation

The Company estimates the fair value of stock-based awards on the date of grant. The fair value of stock options with only service conditions is determined using the Black-Scholes option-pricing model. The fair value of market-based stock options and restricted stock units is determined using a Monte Carlo simulation embedded in a lattice model. The fair value of restricted stock awards is based on the closing price of the Company’s common stock on the date of grant. The determination of the fair value of the Company’s stock option awards, restricted stock units, and restricted stock awards is based on a variety of factors including, but not limited to, the Company’s common stock price, expected stock price volatility over the expected life of awards, and actual and projected exercise behavior. Additionally, the Company has estimated forfeitures for stock-based awards at the dates of grant based on historical experience and adjusted for future expectation. The forfeiture estimate is revised as necessary if actual forfeitures differ from these estimates.

The Company issues restricted stock awards where restrictions lapse upon the passage of time (service vesting), achieving performance targets, or some combination of these restrictions. For those restricted stock awards with only service conditions, the Company recognizes compensation cost on a straight-line basis over the explicit service period. For awards with both performance and service conditions, the Company starts recognizing compensation cost over the remaining service period, when it is probable the performance condition will be met. For stock awards that contain market vesting conditions, the Company recognizes compensation cost of the original estimate of the derived service period, based on its initial valuation analysis regardless of market performance. Stock awards that contain performance or market vesting conditions are excluded from diluted earnings per share computations until the contingency is met as of the end of that reporting period.

Income Taxes

Income taxes are accounted for using the asset and liability method. Deferred income taxes are provided for temporary differences in recognizing certain income, expense and credit items for financial reporting purposes and tax reporting purposes. Such deferred income taxes primarily relate to the difference between the tax basis of assets and liabilities and their financial reporting amounts. Deferred tax assets and liabilities are measured by applying enacted statutory tax rates applicable to the future years in which deferred tax assets or liabilities are expected to be paid or realized.

The Company records a valuation allowance when it determines, based on available positive and negative evidence, that it is more-likely-than-not that some portion or all of its deferred tax assets will not be realized. The Company determines the realizability of its deferred tax assets primarily based on the reversal of existing taxable temporary differences and projections of future taxable income (exclusive of reversing temporary differences and carryforwards). In evaluating such projections, the Company considers its history of profitability, the competitive environment, the overall outlook for the online marketing industry and general economic conditions. In addition, the Company considers the time frame over which it would take to utilize the deferred tax assets prior to their expiration.

For certain tax positions, the Company uses a more-likely-than-not threshold based on the technical merits of the tax position taken. Tax positions that meet the more-likely-than-not recognition threshold are measured at the largest amount of tax benefits determined on a cumulative probability basis, which are more-likely-than-not to be realized upon ultimate settlement in the financial statements. The Company’s policy is to recognize interest and penalties related to income tax matters in income tax expense.

Earnings Per Share

Basic net income/loss per common share excludes dilution for potential common stock issuances and is computed by dividing net income/loss by the weighted-average number of common shares outstanding for the period. Diluted net income/loss per common share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. Diluted earnings per share assumes the exercise of stock options, restricted stock units and warrants using the treasury stock method. The Company reported net income for the three months ending September 30, 2015. The Company's restricted stock awards are participating securities when the Company has net income. As such, the Company has used a two-class method to allocate undistributed earnings between the common stock holders and participating securities to determine the basic and dilutive EPS. The weighted-average shares outstanding-common stock has been adjusted to reflect share repurchases made during the three and nine months ended September 30, 2015. See Footnote 10, Share Repurchases, for more information pertaining to the Company's share repurchases.

The following table provides a reconciliation of the numerators and denominators used in computing basic and diluted net income (loss) per common share:



	Three Months Ended September 30,					Nine Months Ended September 30,
	2015		2014			2015			2014
	(In thousands, except share and per share data)					(In thousands, except share and per share data)
Net income (loss)	$	961	$	(3,261	)	$	(11,151	)	$	(7,243	)
Net income (loss) per share - common stock:
Basic	$	0.02	$	(0.10	)	$	(0.30	)	$	(0.22	)
Diluted	$	0.02	$	(0.10	)	$	(0.30	)	$	(0.22	)
Weighted-average shares outstanding-common stock, basic	39,174,438		33,502,533			37,586,329			33,550,933
Effect of dilutive securities	648,285		—			—			—
Weighted-average shares outstanding-common stock, diluted	39,822,723		33,502,533			37,586,329			33,550,933

The following is a summary of common stock equivalents for the securities outstanding during the respective periods that have been excluded from the earnings per share calculations as their impact was anti-dilutive.



	Three Months Ended September 30,		Nine Months Ended September 30,
	2015	2014	2015	2014
Stock options, restricted stock units and restricted stock	—	689,327	779,517	749,311

Recent Pronouncements

In May 2014, FASB issued ASU 2014-09, Revenue (Topic 606): Revenue from Contracts with Customers, which will replace existing revenue recognition standards and significantly expand the disclosure requirements for revenue arrangements. In August 2015, the FASB deferred by one-year the effective date of the standard to January 1, 2018, with an option that would permit companies to adopt the standard as early as the original effective date of 2017. The Company is currently evaluating the methods of adoption allowed by the new standard and the impact the standard is expected to have on the Company's financial statements and related disclosures.

In April 2014, FASB issued ASU 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. This update requires that the disposal of a component of an entity shall be reported in discontinued operations if the disposal represents a strategic shift that will have a major effect on an entity's operations and financial results. This update is effective January 1, 2015 for interim and annual reporting periods. The Company will evaluate the impact of this standard on its consolidated financial statements in the event of a future disposition.

In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments (Topic 805): Business Combinations, which requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The standard is effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The guidance is to be applied prospectively to adjustments to provisional amounts that occur after the effective date of the guidance, with earlier application permitted for financial statements that have not been issued. The Company does not expect that the adoption of this ASU will have a significant impact its consolidated financial statements.

- Definition

The entire disclosure for all significant accounting policies of the reporting entity.

+ References+ Details

Business Combinations (Notes)

9 Months Ended

Sep. 30, 2015

Business Combinations [Abstract]

Business Combinations



3.	Business Combinations

The Company uses its best estimates and assumptions as a part of the purchase price allocation process to accurately value assets acquired and liabilities assumed at the business combination date, its estimates and assumptions are inherently uncertain and subject to refinement. As a result, during the preliminary purchase price allocation period, which may be up to one year from the business combination date, the Company records adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. The Company records adjustments to assets acquired or liabilities assumed subsequent to the purchase price allocation period in its operating results in the period in which the adjustments were determined.

Entry into an Agreement and Plan of Merger and Reorganization with Rentrak

On September 29, 2015, the Company, Rentrak Corporation, an Oregon corporation (“Rentrak”), and Rum Acquisition Corporation, an Oregon corporation and a wholly owned subsidiary of the Company (“Merger Sub”), entered into an Agreement and Plan of Merger and Reorganization, pursuant to which Merger Sub will merge with and into Rentrak (the “Merger”), with Rentrak surviving the Merger as a wholly owned subsidiary of the Company. The Merger has not closed as of the date of the financial statements and is subject to customary closing conditions that remain pending.

Acquisition of Kantar Group's European IAM Business

On April 1, 2015, the Company closed on material definitive agreements with WPP plc and its affiliates (collectively, "WPP"). Under the agreements, the Company acquired all of the outstanding common stock in WPP's internet audience measurement business in Norway, Sweden and Finland ("European IAM Business") and entered into an alliance in which the Company and WPP will collaborate on cross-media audience measurement business outside the United States (the "Strategic Alliance").

Pursuant to the agreements, the Company issued 1,605,330 shares of common stock, which were issued from treasury shares, representing 4.45% of the Company's post-transaction outstanding common stock with a fair value of $82.5 million in exchange for the European IAM Business and the Strategic Alliance.

The agreements also provided that immediately following the signing of such agreements, WPP would conduct a tender offer to purchase an amount of the Company's shares at a price per share equal to $46.13. In the event the combination of shares issued for the European IAM Business and the Strategic Alliance and the shares purchased in the tender offer failed to result in beneficial ownership by WPP of at least 15% of the Company's outstanding common stock, the Company agreed to directly issue and sell additional shares at the tender offer price of $46.13 to WPP to achieve the minimum of 15%. As WPP was unable to acquire sufficient shares through the tender offer, the Company sold and WPP purchased 4,438,353 newly issued shares of the Company's common stock in exchange for cash of $204.7 million. As of the date of issuance, the difference between the fair market value of the shares issued and the tender offer price was $23.6 million.

Total fair value consideration for the transactions was $310.8 million for which the Company issued 6,043,683 shares of outstanding common stock. The fair value of the European IAM Business was determined to be approximately $8.5 million and the fair value of the intangible asset associated with the Strategic Alliance was determined to be approximately $98.6 million, adjusted for the capitalization of asset acquisition costs of $1.0 million. The Strategic Alliance was recorded as a definitive-lived intangible asset classified as, acquired relationship / technology, that will be amortized over the ten year life of the agreement. Further, the Company received $201.3 million in cash, net of equity issuance costs incurred of $3.4 million.

The acquisition of the European IAM Business resulted in goodwill of approximately $5.3 million, net of a $0.1 million working capital adjustment made during the three months ended September 30, 2015. This amount represents the residual of the fair value of the business after allocation of net assets and identifiable intangible assets acquired. The amount is consistent with the Company's intention for the acquisition of the European IAM Business. During the nine months ended September 30, 2015, the Company incurred transaction costs related to its acquisition of the European IAM Business and Strategic Alliance of approximately $1.9 million.

In addition, as part of the acquisition of the European IAM Business, the Company acquired definitive-lived intangible assets totaling $3.0 million. The following table outlines the fair value of the intangible assets and the useful life for each type of intangible asset. The intangible assets are amortized using a straight-line method.



	Fair Value (in thousands)		Useful Lives (Years)
Name and trademarks	$	370	6.0
Panel	1,580		2.0
Intellectual property	840		2.0
Customer relationships	200		7.0
	$	2,990

In addition to the definitive-lived intangible assets above, the Company acquired less than $0.1 million of net tangible assets.

The Company is still in the process of evaluating the opening balance sheet of the European IAM Business and may adjust the preliminary purchase accounting after obtaining more information. The results of the European IAM Business have been included in the financial statements since the date of acquisition and were not material to the overall consolidated results of the Company.

As of April 1, 2015, WPP's aggregate holdings amount to 15% of the Company's common stock, see Footnote 12, Related Party Transactions.

Acquisition of Proximic

On April 23, 2015, the Company entered into an Agreement and Plan of Merger to acquire Proximic, Inc. ("Proximic") for $9.5 million cash in exchange for all of the outstanding capital stock of Proximic. The Company acquired Proximic to power enhancements to brand safety and content categorization capabilities across the Company's product offerings.

The acquisition of Proximic resulted in goodwill of approximately $4.5 million, none of which is deductible for tax purposes. This amount represents the residual amount of the total purchase price after determining the fair value for net assets and identifiable intangible assets acquired. The amount recorded as goodwill is consistent with the Company's intentions for the acquisition of Proximic. During the nine months ended September 30, 2015, the Company incurred transaction costs related to its acquisition of Proximic of approximately $0.4 million.

The preliminary purchase price of Proximic is allocated as follows (in thousands):



Net tangible assets acquired	$	714
Definite-lived intangible assets acquired	4,290
Goodwill	4,496
Total purchase price, net of cash acquired	$	9,500

The following table outlines the fair value of the intangible assets and the useful life for each type of intangible asset. The intangible assets are amortized using a straight-line method.



	Fair Value (in thousands)		Useful Lives (Years)
Name and trademarks	$	190	1.5
Customer relationship	1,700		5.0
Acquired methodologies/technology	2,400		3.0
	$	4,290

The Company is still in the process of evaluating the opening balance sheet and may adjust the preliminary purchase accounting after obtaining more information. The results of Proximic have been included in the financial statements since the date of acquisition and were not material to the overall consolidated results of the Company.

Acquisition of MdotLabs

On August 4, 2014 the Company entered into and closed on a definitive Stock Purchase Agreement (the "Stock Purchase Agreement") with M.Labs, Inc., a Delaware corporation ("MdotLabs"). On August 4, 2014 comScore completed its purchase of all of the outstanding capital stock of MdotLabs, and MdotLabs became a wholly-owned subsidiary of comScore. MdotLabs is a SaaS security platform designed to combat invalid activity in web and mobile advertising, such as non-human traffic. The aggregate amount of the consideration paid by the Company upon the closing of the transaction was $4.5 million, which was comprised entirely of cash.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Asset Dispositions (Notes)

9 Months Ended

Sep. 30, 2015

Discontinued Operations and Disposal Groups [Abstract]

Asset Disposals



4.	Asset Dispositions

Disposition of the mobile operator analytics business

On May 11, 2015, the Company sold certain assets related to its mobile operator analytics business ("CSWS") to a Buyer. CSWS, formerly known as Nexius, Inc. was acquired on July 1, 2010.

In connection with the disposition, the Buyer assumed certain customer liabilities. Further, the Company paid the Buyer for customer balances collected in 2015. The Company entered into a loan and security agreement which allows the Buyer to borrow up to $1.5 million, subject to various restrictions, and annual reductions in the borrowing amount of $0.5 million per year until April 30, 2018. The loan is secured by all of the assets of the Buyer, with interest due quarterly. As of September 30, 2015, the Buyer has not borrowed any funds under the agreement. The Company, without compensation, will provide ongoing technology and transitional services to the Buyer for up to one year from the closing date of the transaction. The costs associated with these services are not significant.

As a result of the disposition, the Company recorded a loss on the disposition of $5.2 million, determined as follows (in thousands):



Relief from certain customer obligations	$	3,551
Carrying value of net assets disposed	(6,242		)
	(2,691		)
Cash paid for disposition of business	(2,535		)
Loss on sale of assets	$	(5,226	)

The remaining $0.5 million of cash due to Buyer as of June 30, 2015 related to the disposition was paid during the three months ended September 30, 2015 and is included in the cash paid for disposition in the table above.

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

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+ Details

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets



5.	Goodwill and Intangible Assets

The change in the carrying value of goodwill for the nine months ended September 30, 2015 is as follows (in thousands):



Balance as of December 31, 2014	$	103,525
Acquisition of Proximic	4,496
Acquisition of European IAM Business	5,303
Translation adjustments	(1,761		)
Balance as of September 30, 2015	$	111,563

The carrying values of the Company’s amortizable acquired intangible assets are as follows (in thousands):



	September 30, 2015							December 31, 2014
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Acquired methodologies/technology	$	8,857	$	(6,044	)	$	2,813	$	6,612	$	(5,180	)	$	1,432
Acquired relationship/technology	98,622		(4,931		)	93,691		—		—			—
Customer relationships	19,843		(14,198		)	5,645		19,201		(12,970		)	6,231
Intellectual property	14,396		(6,886		)	7,510		13,562		(5,528		)	8,034
Panel	3,199		(2,003		)	1,196		1,617		(1,521		)	96
Trade names	2,120		(1,645		)	475		1,690		(1,690		)	—
	$	147,037	$	(35,707	)	$	111,330	$	42,682	$	(26,889	)	$	15,793

Amortization expense related to intangible assets was approximately $4.2 million and $9.9 million for the three and nine months ended September 30, 2015, respectively, and $1.9 million and $5.8 million for the three and nine months ended September 30, 2014, respectively.

The weighted average remaining amortization period by major asset class as of September 30, 2015, is as follows:



	(In years)
Acquired methodologies/technology	2.7
Acquired relationship/technology	9.5
Customer relationships	2.8
Intellectual property	5.8
Panel	1.5
Trade names	4.2

The estimated future amortization of acquired intangible assets as of September 30, 2015 is as follows:



	(In thousands)
2015	$	4,166
2016	16,275
2017	14,360
2018	11,665
2019	10,809
Thereafter	54,055
	$	111,330

During the three months ended September 30, 2014, the Company performed an impairment test of the long-lived assets of CSWS by comparing the sum of the undiscounted cash flows expected to result from the use and eventual disposition of CSWS to the carrying value of CSWS's long-lived assets. Based on this analysis, the Company determined as of September 30, 2014 that the CSWS intangible assets were impaired. The Company estimated the fair value of the intangible asset of CSWS to be$2.8 million as of September 30, 2014, which resulted in an impairment charge of $6.9 million during the three months ended September 30, 2014. The impairment charge had a negative impact on income from operations of $6.9 million and an impact on earnings per share of $0.21 per share during the three and nine months ended September 30, 2014.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References+ Details

Long-term Debt and Other Financing Arrangement

9 Months Ended

Sep. 30, 2015

Long-term Debt and Capital Lease Obligations [Abstract]

Long-term Debt and Other Financing Arrangement



6.	Long-term Debt and Other Financing Arrangement

Capital Leases

The Company has a lease financing arrangement with Banc of America Leasing & Capital, LLC in the amount of $10.0 million, of which the Company can utilize approximately $7.2 million as of September 30, 2015, for future capital leases. This arrangement allows the Company to lease new software, hardware and other computer equipment as it expands its technology infrastructure in support of its business growth. Under this arrangement, the Company may enter into new capital leases prior to May 15, 2016. Some of the amounts the Company has utilized to date under this arrangement have not lowered the amount available for future capital leases, because those amounts have been assigned by Banc of America Leasing & Capital, LLC under separate third-party arrangements. In addition, the Company enters into capital leases under non-committed arrangements, typically directly with equipment manufacturers.

Future minimum payments under capital leases with initial terms of one year or more are as follows:



	(In thousands)
2015	$	4,577
2016	15,864
2017	9,343
2018	2,854
2019	51
2020	21
Total minimum lease payments	32,710
Less amount representing interest	(1,657		)
Present value of net minimum lease payments	31,053
Less current portion	(16,380		)
Capital lease obligations, long-term	$	14,673

During the nine months ended September 30, 2015 and 2014, the Company incurred $16.5 million and $10.9 million, in capital lease obligations, respectively.

Revolving Credit Facility

On September 26, 2013, the Company entered into a Credit Agreement (the "Credit Agreement") with several banks (the "Lenders"). Bank of America, N.A. (“Bank of America”) is the administrative agent, and lead lender of this Revolving Credit Facility. The Credit Agreement provides for a five-year revolving credit facility of $100.0 million, which includes a $10.0 million sublimit for issuance of standby letters of credit, a $10.0 million sublimit for swing line loans and a $10.0 million sublimit for alternative currency lending. The maturity date of the Credit Agreement is September 26, 2018. The Credit Agreement also contains an expansion option permitting the Company to request an increase of the credit facility up to an aggregate additional $50.0 million, subject to certain conditions. Borrowings under the Revolving Credit Facility shall be used towards working capital and other general corporate purposes as well as for the issuance of letters of credit. On June 23, 2014, the Company executed the First Amendment to the Credit Agreement. This amendment reset the equity repurchase limit to $50.0 million and permits the Company to repurchase equity interests in the Company outside the $50.0 million limit during the remainder of the five-year revolver term, provided that certain financial thresholds are met.

Base rate loans and swing line loans will bear interest at the Base Rate plus the Applicable Rate, as such terms are defined in the Credit Agreement and summarized below. The Base Rate is the highest rate of the following: (a) the Federal Funds rate plus 0.50%, (b) the publicly announced Bank of America prime rate, and (c) the Eurocurrency rate, as defined in the Credit Agreement plus 1.0%. The Applicable Rate for base rate loans and swing line loans is 0.50% to 1.50% depending on the Company’s funded debt-to-EBITDA ratio at the end of each fiscal quarter. Amounts supporting letters of credit bear interest at the applicable rate for revolving loans. Each Eurocurrency rate loan will bear interest at the Eurocurrency Rate plus the Applicable Rate ranging from 1.50% to 2.50% depending on the Company's funded debt-to-EBITDA ratio at the end of each fiscal quarter. Beginning on September 26, 2013 through the maturity date of the five-year revolver term, the Company is obligated to pay a fee, payable quarterly in arrears, based on the average unused portion of the available amounts under the Credit Agreement at a rate of 0.20% to 0.35% per annum depending on the Company’s funded debt-to-EBITDA ratio at the end of each fiscal quarter.

The Credit Agreement contains various usual and customary covenants, including, but not limited to: financial covenants requiring maximum funded debt-to-EBITDA ratio, cash flow-to-fixed charge ratios and a minimum liquidity during equity repurchase periods as well as covenants relating to the Company’s ability to dispose of assets, make certain acquisitions, be acquired, incur indebtedness, grant liens and make certain investments. As of September 30, 2015 the Company was in full compliance with all covenants contained in the Credit Agreement.

As of September 30, 2015, the Company did not have an outstanding balance under the terms of the Credit Agreement.

The Company maintains letters of credit in lieu of security deposits with respect to certain office leases as well as to satisfy performance guarantees under certain contracts. As of September 30, 2015, $3.5 million in letters of credit were outstanding, leaving $6.5 million available for additional letters of credit. These letters of credit may be reduced periodically provided the Company meets the conditional criteria of each related lease agreement.

Contingencies	9 Months Ended
Contingencies	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies From time to time, the Company is involved in various legal proceedings and claims arising from the normal course of business. Although the outcome of any legal proceeding cannot be predicted with certainty, management believes that the final outcome and resolution of current matters, if any, will not materially affect the Company’s consolidated financial position or results of operations. Litigation Related to Pending Merger with Rentrak Corporation Since the public announcement of the Company’s proposed merger with Rentrak Corporation (“Rentrak”) on September 29, 2015, four putative shareholder class action lawsuits have been filed against Rentrak, its directors, the Company and other defendants, as described further below, in connection with Rentrak and the Company entering into a merger agreement on September 29, 2015 (the “Merger Agreement”). The four actions were filed in Multnomah County Circuit Court in the State of Oregon: (1) Nathan v. Rentrak Corporation, et al., No. 15CV27429, filed on October 9, 2015; (2) Blum v. Rentrak Corporation, et al., No. 15CV27443, also filed on October 9, 2015; (3) Stein v. Rentrak Corporation, et al., No. 15CV27520, filed on October 12, 2015; and (4) Sikorski v. Rentrak Corporation, et al., No. 15CV27932, filed on October 14, 2015. Each of the foregoing lawsuits was filed on behalf of a putative class of Rentrak shareholders against Rentrak, the individual members of Rentrak’s board of directors, and/or comScore and/or its merger subsidiary entity (the Nathan action does not name comScore or the merger subsidiary entity as defendants). The lawsuits allege variously that the individual members of Rentrak’s board of directors breached their fiduciary duties owed to Rentrak’s shareholders by (a) approving the proposed merger for inadequate consideration; (b) approving the merger to obtain unique benefits not shared equally with other Rentrak shareholders; (c) failing to take steps to maximize the value paid to Rentrak shareholders; (d) failing to take steps to ensure a fair process leading up to the proposed merger; (e) agreeing to preclusive deal protection devices in the merger agreement; and (f) failing to ensure that no conflicts exist between individual directors’ own interests and their fiduciary obligations to Rentrak’s shareholders. The Blum, Stein and Sikorski lawsuits also state claims against comScore and/or the merger subsidiary entity for aiding and abetting these alleged breaches of fiduciary duties. The plaintiffs in each of the lawsuits generally seek, among other things, declaratory and injunctive relief concerning the alleged breaches of fiduciary duties, injunctive relief prohibiting completion of the mergers, rescission of the merger if it is completed, an accounting by defendants, rescissionary damages, attorney’s fees and costs, and other relief. On October 22, 2015, in the Nathan lawsuit, plaintiffs filed a motion to consolidate the lawsuits and appoint Nathan as the lead plaintiff and Nathan’s counsel as lead counsel, and that motion is supported by the plaintiff’s counsel in the Blum, Stein and Sikorski lawsuits. This motion is pending with the court. Based on examination of the claims, the Company believes that, as to the Company, they are without merit. The Company continues to investigate the claims and intends to vigorously protect and defend itself. It is not possible for the Company to estimate a potential range of loss at this time.

- Definition

The entire disclosure for commitments and contingencies.

+ References+ Details

Income Taxes

9 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes



8.	Income Taxes

The Company’s income tax provision for interim periods is calculated by applying its estimated annual effective tax rate on ordinary income before taxes to year-to-date ordinary book income before taxes. The income tax effects of any extraordinary, significant unusual or infrequent items not included in ordinary book income are determined separately and recognized in the period in which the items arise.

During the three and nine months ended September 30, 2015, the Company recorded income tax benefits of $40,000 and $0.3 million, respectively, resulting in effective tax rates of (4.3%) and 2.8%, respectively. During the three and nine months ended September 30, 2014, the Company recorded income tax benefits of $2.6 million and $2.0 million, respectively, resulting in effective tax rates of 43.9% and 21.2%, respectively. These effective tax rates differ from the Federal statutory rate of 35% due to the effects of state income taxes, foreign income taxes, nondeductible expenses such as certain stock compensation and meals and entertainment, unrecognized tax benefits and changes in statutory tax rates which took effect during the year. The effective tax rate for the three and nine months ended September 30, 2015 decreased compared to the effective tax rate for the three and nine months ended September 30, 2014 primarily as a result of tax benefits associated with the disposition of the mobile operator analytics business.

As of September 30, 2015 and December 31, 2014, the Company had unrecognized tax benefits of approximately $1.4 million, of which approximately $0.9 million is netted against certain deferred tax assets on the accompanying consolidated balance sheets. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in income tax expense.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References+ Details

Stockholders' Equity

9 Months Ended

Sep. 30, 2015

Stockholders' Equity Note [Abstract]

Stockholders' Equity



9.	Stockholders’ Equity

1999 Stock Option Plan and 2007 Equity Incentive Plan

Prior to the effective date of the registration statement for the Company’s initial public offering (“IPO”) on June 26, 2007, eligible employees and non-employees were awarded options to purchase shares of the Company’s common stock, restricted stock or restricted stock units pursuant to the Company’s 1999 Stock Plan (the “1999 Plan”). Upon the effective date of the registration statement of the Company’s IPO, the Company ceased using the 1999 Plan for the issuance of new equity awards. Upon the closing of the Company’s IPO on July 2, 2007, the Company established its 2007 Equity Incentive Plan, as amended (the “2007 Plan” and together with the 1999 Plan, the “Plans”). The 1999 Plan will continue to govern the terms and conditions of outstanding awards granted thereunder, but no further shares are authorized for new awards under the 1999 Plan. As of September 30, 2015 and December 31, 2014, the Plans provided for the issuance of a maximum of approximately 12.7 million shares and 11.4 million shares, respectively, of common stock. In addition, the 2007 Plan provides for annual increases in the number of shares available for issuance thereunder on the first day of each fiscal year beginning with the 2008 fiscal year, equal to the lesser of: (i) 4% of the outstanding shares of the Company’s common stock on the last day of the immediately preceding fiscal year; (ii) 1,800,000 shares; or (iii) such other amount as the Company’s Board of Directors may determine. The vesting period of options granted under the Plans is determined by the Board of Directors, although, for service-based options the vesting has historically been generally ratable over a four-year period. Options generally expire 10 years from the date of the grant. Effective January 1, 2015, the shares available for grant increased by 1,366,979 pursuant to the automatic share reserve increase provision under the 2007 Plan. Accordingly, as of September 30, 2015, a total of 2,535,262 shares were available for future grant under the 2007 Plan.

The Company estimates the fair value of stock option awards using the Black-Scholes option-pricing formula and a single option award approach. The fair value of market-based stock options and market-based restricted stock units is determined using a Monte Carlo simulation embedded in a lattice model. The fair value of restricted stock awards is based on the closing price of our common stock on the date of grant. The Company then amortizes the fair value of awards expected to vest on a ratable straight-line basis over the requisite service periods of the awards, which is generally the period from the grant date to the end of the vesting period.

During the twelve months ended December 31, 2014, the Company granted 1,969,453 market-based options and 283,356 market-based restricted stock units to its named executive officers and other key management personnel.

These market-based grants were designed to motivate management to drive enterprise value toward a significantly higher market capitalization over the next three years. In addition, the 30-day price average and bifurcated vesting provisions described below were intended to promote sustainability of the achievement.

The awards were granted effective as of November 7, 2014. The market-based options were issued with an exercise price of $42.92 per share, which is equal to the closing price of the Company’s common stock as reported by the NASDAQ Global Market on November 7, 2014. Each of the awards is subject to market-based vesting, as follows:

•

66% of the shares subject to each option award, and 48% of the restricted stock units will vest in the event that the closing price of the Company’s common stock as reported by the NASDAQ Global Market exceeds an average of $48 per share for a consecutive thirty calendar day period prior to November 7, 2017. Such target represents a 25% increase over the 30-day average closing price of the Company’s common stock as reported by the NASDAQ Global Market ending on the date of award.


•	10% of the shares subject to each option award, and 10% of the restricted stock units will vest in the event that the closing price of the Company’s common stock as reported by the NASDAQ Global Market exceeds an average of $50 per share for a consecutive thirty calendar day period prior to November 7, 2017.


•	14% of the shares subject to each option award, and 22% of the restricted stock units will vest in the event that the closing price of the Company’s common stock as reported by the NASDAQ Global Market exceeds an average of $55 per share for a consecutive thirty calendar day period prior to November 7, 2017.


•	10% of the shares subject to each option award, and 20% of the restricted stock units will vest in the event that the closing price of the Company’s common stock as reported by the NASDAQ Global Market exceeds an average of $60 per share for a consecutive thirty calendar day period prior to November 7, 2017.

As of September 30, 2015, the stock-based compensation expense related to the November 7, 2014 awards have been fully recognized in the consolidated statements of operations and comprehensive loss.

The following are the weighted-average assumptions used in valuing the stock options granted during the year ended December 31, 2014 and a discussion of the Company’s assumptions.



	Year Ended December 31,
	2014
Dividend yield	0.00	%
Expected volatility	34.11	%
Risk-free interest rate	0.96	%
Expected life of options (in years)	3.00

Dividend yield — The Company has never declared or paid dividends on its common stock and has no plans to pay dividends in the foreseeable future.

Expected volatility — Volatility is a measure of the amount by which a financial variable such as a share price has fluctuated (historical volatility) or is expected to fluctuate (expected volatility) during a period. The expected volatility is calculated based on the weekly closing price volatility of the Company’s common stock for the period from its initial public offering until the grant date.

Risk-free interest rate — The Company used rates on the grant date of zero-coupon government bonds with maturities over periods covering the term of the awards, converted to continuously compounded forward rates.

Expected life of the options — This is the period of time that the options granted are expected to remain outstanding.

A summary of the Plans is presented below:



	Number of Shares		Weighted- Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Options outstanding at December 31, 2014	1,980,308		$	42.71	9.81	7,359
Options granted	—		—		—	—
Options exercised	(276,064	)	42.10		—	3,013
Options forfeited	—		—		—	—
Options expired	(200	)	4.25		—	—
Options outstanding at September 30, 2015	1,704,044		$	42.82	9.09	5,677
Options exercisable at September 30, 2015	1,704,044		$	42.82	9.09	5,677

The intrinsic value of exercised stock options is calculated based on the difference between the exercise price and the quoted market price of our common stock as of the close of the exercise date. The aggregate intrinsic value of options exercised for the three months ended September 30, 2015 was less than $0.1 million. The aggregate intrinsic value of options exercised for the three and nine months ended September 30, 2014 was $0.6 million and $0.7 million, respectively. As of September 30, 2015, there was no unrecognized compensation expense related to outstanding options and exercisable options..

The Company’s non-vested stock awards are comprised of restricted stock and restricted stock units. The Company has a right of repurchase on such shares that lapse at a rate of twenty-five percent (25)% of the total shares awarded at each successive anniversary of the initial award date, provided that the employee continues to provide services to the Company. In the event that an employee terminates his or her employment with the Company, any shares that remain unvested and consequently subject to the right of repurchase shall be automatically reacquired by the Company at the original purchase price paid by the employee. During the three months ended September 30, 2015, 500 forfeited shares of restricted stock have been repurchased by the Company at no cost and were subsequently retired.

A summary of the status for non-vested stock awards as of September 30, 2015 is presented as follows:



Non-vested Stock Awards	Restricted Stock		Restricted Stock Units		Total Number of Shares Underlying Awards		Weighted Average Grant-Date Fair Value
Non-vested at December 31, 2014	476,993		1,410,581		1,887,574		$	26.88
Granted	189,708		297,306		487,014		49.17
Vested	(531,168	)	(754,491	)	(1,285,659	)	32.49
Forfeited	(10,263	)	(81,920	)	(92,183	)	35.03
Non-vested at September 30, 2015	125,270		871,476		996,746		$	29.79

The aggregate intrinsic value for all non-vested shares of restricted stock and restricted stock units outstanding as of September 30, 2015 was $44.7 million. The aggregate intrinsic value of restricted stock and restricted stock units vested during the three months ended September 30, 2015 was $7.7 million.

The Company granted non-vested stock awards at no cost to recipients during the three months ended September 30, 2015. As of September 30, 2015, total unrecognized compensation expense related to non-vested restricted stock and restricted stock units was $23.1 million, which the Company expects to recognize over a weighted-average period of approximately 1.04 years. Total unrecognized compensation expense may be increased or decreased in future periods for subsequent grants or forfeitures.

Of the 129,170 shares of the Company’s restricted stock and restricted stock units vesting during the three months ended September 30, 2015, the Company repurchased 48,226 shares at an aggregate purchase price of approximately $2.6 million pursuant to the stockholder’s right under the Plans to elect to use common stock to satisfy tax withholding obligations. The repurchased shares were subsequently retired.

Shares Reserved for Issuance

At September 30, 2015, the Company had reserved for future issuance the following shares of common stock:



Common stock available for future issuances under the Plans	2,535,262
Common stock reserved for outstanding options and restricted stock units	2,575,520
	5,110,782

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Share Repurchases

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Share Repurchases



10.	Share Repurchases

As part of the Company's share repurchase program, shares may be purchased in open market transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Exchange Act. The timing, manner, price and amount of any repurchases will be determined at our discretion, and the share repurchase program may be suspended, terminated or modified at any time for any reason. Shares repurchased are classified as Treasury Stock. Details of the share repurchases during the three and nine months ended September 30, 2015 and 2014 under the Company's share repurchase programs were as follows:



	Three Months Ended September 30,		Nine Months Ended September 30,
	2015 (1)	2014 (2)	2015 (1)(2)	2014 (2)(3)
(Amounts in millions, except share and per share data)
Total number of shares repurchased	823,779	16,100	1,949,580	1,253,672
Average price paid per share	$55.78	$36.86	$54.33	$29.42
Total value of shares repurchased (as measured at time of repurchase)	$45.9	$0.6	$105.9	$36.9

(1) May 2015 Share Repurchase Program

On May 5, 2015 the Company announced that its board of directors had approved the repurchase of up to $150.0 million of the Company's common stock which commenced on May 6, 2015. Such repurchases may be made from time to time subject to pre-determined price and volume guidelines established by our board of directors. Through September 30, 2015 this program resulted in the repurchase of $99.9 million of shares (as measured at the time of repurchase) $50.1 million of shares (as measured at the time of repurchase), remain available for repurchase. The program was suspended pending closing of the Rentrak merger.

(2) June 2014 Share Repurchase Program

On June 5, 2014 the Company announced that its board of directors had approved the repurchase of up to an additional $50.0 million of our common stock. Such repurchases may be made from time to time subject to pre-determined price and volume guidelines established by our board of directors and commenced on June 6, 2014. This repurchase program concluded on May 5, 2015 and resulted in the repurchase of $6.9 million of shares (as measured at the time of repurchase).

(3) June 2013 Share Repurchase Program

On June 3, 2013 the Company announced that its board of directors had approved the repurchase of up to $50 million of the Company's common stock. Such repurchases may be made from time to time subject to pre-determined price and volume guidelines established by the Company's board of directors and commenced on June 4, 2013. This repurchase program concluded on May 29, 2014 and resulted in the repurchase of $49.4 million of shares (as measured at the time of repurchase).

Geographic Information

9 Months Ended

Sep. 30, 2015

Segments, Geographical Areas [Abstract]

Geographic Information



11.	Geographic Information

The Company attributes revenues to customers based on the location of the customer. The composition of the Company’s sales to unaffiliated customers between those in the United States and those in other locations for the three and nine months ended September 30, 2015 and 2014 is set forth below:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(In thousands)				(In thousands)
United States	$	67,577	$	57,038	$	197,312	$	167,297
Europe	15,263		14,346		45,953		41,563
Canada	3,821		3,683		10,213		10,376
Other	5,744		7,069		17,670		19,812
Total revenues	$	92,405	$	82,136	$	271,148	$	239,048

The composition of the Company’s property and equipment between those in the United States and those in other countries as of the end of each period is set forth below:



	September 30, 2015		December 31, 2014
	(In thousands)
United States	$	39,522	$	38,240
Europe	5,242		3,375
Canada	134		195
Other	584		555
Total	$	45,482	$	42,365

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 30

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 42

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 31

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 40

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

+ Details

Related Party Transactions (Notes)

9 Months Ended

Sep. 30, 2015

Related Party Transactions



12.	Related Party Transactions

Transactions with WPP

As of September 30, 2015, WPP owned approximately six million shares of the Company's outstanding common stock, representing approximately 16% ownership in the Company.

The Company provides to WPP and its affiliates, in the normal course of business, subscription-based products and custom revenue projects and receives various services from WPP and its affiliates supporting the Company's data collection efforts.

The Company's results from transactions with WPP and its affiliates for the three and nine months ended September 30, 2015 are set forth below:



	Three Months Ended September 30,		Nine Months Ended September 30,
	2015		2015
	(In thousands)
Revenue	$	1,796	$	4,673	(1)
Expenses	$	1,184	$	2,325	(1)

(1) Represents transactions since April 2015.

The Company has the following balances related to transactions with WPP and its affiliates reflected in the consolidated balance sheet as of September 30, 2015:



	(In thousands)
Accounts receivable	$	1,475
Accounts payable	$	1,279
Deferred revenue	$	545

Data Exchange Agreement

In addition, in 2013, the Company entered into an agreement to exchange certain data assets with a corporation. During the three months ended December 31, 2014, the Company and the corporation modified the existing agreement, where the parties will provide additional data assets. A member of the Company’s Board of Directors also serves as a member of the Board of Directors of that corporation. The transaction was considered to have commercial substance under the guidance in ASC 845 and the Company estimated the fair value of the services delivered based on similar monetary transactions with third parties. No cash was exchanged in this transaction.

During the three and nine months ended September 30, 2015, the Company recognized $2.3 million and $6.6 million of revenue and expense of $2.0 million and $6.1 million, respectively, for this nonmonetary transaction.

During the three and nine months ended September 30, 2014, the Company recognized $1.5 million and $4.7 million of revenue and expense of $2.4 million and $5.6 million, respectively, for this nonmonetary transaction.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References+ Details

Subsequent Event

9 Months Ended

Sep. 30, 2015

Subsequent Events [Abstract]

Subsequent Event



13.	Subsequent Events

On November 5, 2015, the Company’s executed a definitive agreement to transfer certain assets and business operations of the Company’s Digital Analytix® Enterprise (“DaX”) solution to Adobe Systems Incorporated (“Adobe”) for $45 million in cash. The transaction is subject to customary closing conditions and is expected to close in the fourth quarter of 2015.

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying interim consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany transactions and accounts have been eliminated upon consolidation. The Company consolidates investments where it has a controlling financial interest. The usual condition for controlling financial interest is ownership of a majority of the voting interest and, therefore, as a general rule, ownership, directly or indirectly, of more than 50% of the outstanding voting shares is a condition indicating consolidation. All of the Company's subsidiaries are wholly owned.
Unaudited Interim Financial Information	Unaudited Interim Financial Information The consolidated interim financial statements included in this quarterly report on Form 10-Q have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in consolidated interim financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures contained in this quarterly report comply with the requirements of Section 13(a) of the Securities Exchange Act of 1934 (the “Exchange Act”), as amended, for a quarterly report on Form 10-Q and are adequate to make the information presented not misleading. The consolidated interim financial statements included herein, reflect all adjustments (consisting of normal recurring adjustments) which are, in the opinion of management, necessary for a fair presentation of the financial position, results of operations and cash flows for the interim periods presented. These consolidated interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, filed February 20, 2015 with the SEC. The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of the results to be anticipated for the entire year ending December 31, 2015 or thereafter. All references to September 30, 2015 and 2014 or to the three and nine months ended September 30, 2015 and 2014 in the notes to the consolidated interim financial statements are unaudited.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the reported amounts of revenue and expense during the reporting periods. Significant estimates and assumptions are inherent in the analysis and the measurement of deferred tax assets, the identification and quantification of income tax liabilities due to uncertain tax positions, the valuation and recoverability of intangible assets and goodwill, the collectability of accounts receivable and the allowance for doubtful accounts and evaluating the estimates used in accounting for nonmonetary transactions. The Company bases its estimates on historical experience and assumptions that it believes are reasonable. Actual results could differ from those estimates.
Fair Value Measurements	Fair Value Measurements The Company evaluates the fair value of certain assets and liabilities using the fair value hierarchy. Fair value is an exit price representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the Company applies the three-tier value hierarchy which prioritizes the inputs used in measuring fair value as follows: Level 1 — observable inputs such as quoted prices in active markets; Level 2 — inputs other than the quoted prices in active markets that are observable either directly or indirectly; Level 3 — unobservable inputs of which there is little or no market data, which require the Company to develop its own assumptions. The Company does not currently have any assets or liabilities that are measured at fair value on a recurring basis. However, cash equivalents, accounts receivable, prepaid expenses and other assets, accounts payable, accrued expenses, deferred revenue, deferred rent and capital lease obligations reported in the consolidated balance sheets equal or approximate their respective fair values because of their short term nature.
Cash and Cash Equivalents and Investments	Cash and Cash Equivalents and Investments Cash and cash equivalents consist of highly liquid investments with an original maturity of three months or less at the time of purchase. Cash and cash equivalents are maintained with several financial institutions. The combined account balances held on deposit at each institution typically exceed FDIC insurance coverage and, as a result, there is a concentration of credit risk related to amounts on deposit in excess of FDIC insurance coverage. The Company believes the risk is not significant.
Accounts Receivable	Accounts Receivable Accounts receivable are recorded at the invoiced amount and are non-interest bearing. The Company generally grants uncollateralized credit terms to its customers and maintains an allowance for doubtful accounts to reserve for potentially uncollectible receivables. Allowances are based on management’s judgment, which considers historical experience and specific knowledge of accounts where collectability may not be probable. The Company makes provisions based on historical bad debt experience, a specific review of all significant outstanding invoices and an assessment of general economic conditions. If the financial condition of a customer deteriorates, resulting in an impairment of its ability to make payments, additional allowances may be required. Included within accounts receivable are unbilled accounts receivable, which relate to situations in which the Company has recognized revenue for services performed prior to invoicing a customer, but for which we have the legal right to invoice the customer. Typically, unbilled accounts receivable are invoiced in the following period.
Revenue Recognition	Revenue Recognition The Company recognizes revenues when the following fundamental criteria are met: (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or the services have been rendered, (iii) the fee is fixed or determinable, and (iv) collection of the resulting receivable is reasonably assured. The Company generates revenues by providing access to the Company’s online database or delivering information obtained from the database, usually in the form of periodic reports. Revenues are typically recognized on a straight-line basis over the period in which access to data or reports is provided, which generally ranges from three to twenty-four months. Sales taxes remitted to government authorities are recorded on a net basis. Revenues are also generated through survey services under contracts ranging in term from two months to one year. Survey services consist of survey and questionnaire design with subsequent data collection, analysis and reporting. At the outset of an arrangement, total arrangement consideration is allocated between the development of the survey questionnaire and subsequent data collection, analysis and reporting services based on relative selling price. Revenue allocated to the survey questionnaire is recognized when it is delivered and revenue allocated to the data collection, analysis and reporting services is recognized on a straight-line basis over the estimated data collection period once the survey or questionnaire design has been delivered. Any change in the estimated data collection period results in an adjustment to revenues recognized in future periods. Certain of the Company’s arrangements contain multiple elements, consisting of the various services the Company offers. Multiple element arrangements typically consist of either subscriptions to multiple online products or a subscription to the Company’s online database combined with customized services. The Company accounts for these arrangements in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2009-13, Multiple Deliverable Revenue Arrangements, which requires the Company to allocate arrangement consideration at the inception of an arrangement to all deliverables, if they represent a separate unit of accounting, based on their relative selling prices. The guidance establishes a hierarchy to determine the selling price to be used for allocating arrangement consideration to deliverables: (i) vendor-specific objective evidence of fair value (“VSOE”), (ii) third-party evidence of selling price (“TPE”) if VSOE is not available, or (iii) an estimated selling price (“ESP”) if neither VSOE nor TPE are available. VSOE generally exists only when the Company sells the deliverable separately and is the price actually charged by the Company for that deliverable on a stand-alone basis. ESP reflects the Company’s estimate of what the selling price of a deliverable would be if it was sold regularly on a stand-alone basis. The Company has concluded it generally does not have VSOE for its arrangements, and TPE is generally not available because the Company’s service offerings are highly differentiated and the Company is unable to obtain reliable information on the products and pricing practices of the Company’s competitors. As such, ESP is generally used to allocate the total arrangement consideration at the arrangement inception based on each element’s relative selling price. The Company’s process for determining ESP involves management’s judgments based on multiple factors that may vary depending upon the unique facts and circumstances related to each product suite and deliverable. The Company determines ESP by considering several external and internal factors including, but not limited to, current pricing practices, pricing concentrations such as industry, channel, customer class or geography, internal costs and market penetration of a product or service. The total arrangement consideration is allocated to each of the elements based on the relative selling price. If the ESP is determined as a range of selling prices, the mid-point of the range is used in the relative-selling-price method. Once the total arrangement consideration has been allocated to each deliverable based on the relative allocation of the arrangement fee, the Company commences revenue recognition for each deliverable on a stand-alone basis as the data or service is delivered. ESP will be analyzed on an annual basis or more frequently if management deems it likely that changes in the estimated selling prices have occurred. Generally, contracts are non-refundable and non-cancellable. In the event a portion of a contract is refundable, revenue recognition is delayed until the refund provisions lapse. A limited number of customers have the right to cancel their contracts by providing a written notice of cancellation. In the event that a customer cancels its contract, the customer is not entitled to a refund for prior services, and will be charged for costs incurred plus services performed up to the cancellation date. Advance payments are recorded as deferred revenues until services are delivered or obligations are met and revenue can be recognized. Deferred revenues represent the excess of amounts invoiced over amounts recognized as revenues. Multiple contracts with a single counterparty that are negotiated simultaneously and are considered contemporaneous are accounted for as one arrangement. If there are multiple contracts with one counterparty that are deemed independent of one another, they are accounted for as separate arrangements. The Company accounts for nonmonetary transactions under Accounting Standards Codification ("ASC") 845, Nonmonetary Transactions. Nonmonetary transactions with commercial substance are recorded at the estimated fair value of assets surrendered including cash, if cash is less than 25% of the fair value of the overall exchange, unless the fair value of the assets received is more clearly evident, in which case the fair value of the assets received is used to estimate fair value for the exchange.
Stock-Based Compensation	Stock-Based Compensation The Company estimates the fair value of stock-based awards on the date of grant. The fair value of stock options with only service conditions is determined using the Black-Scholes option-pricing model. The fair value of market-based stock options and restricted stock units is determined using a Monte Carlo simulation embedded in a lattice model. The fair value of restricted stock awards is based on the closing price of the Company’s common stock on the date of grant. The determination of the fair value of the Company’s stock option awards, restricted stock units, and restricted stock awards is based on a variety of factors including, but not limited to, the Company’s common stock price, expected stock price volatility over the expected life of awards, and actual and projected exercise behavior. Additionally, the Company has estimated forfeitures for stock-based awards at the dates of grant based on historical experience and adjusted for future expectation. The forfeiture estimate is revised as necessary if actual forfeitures differ from these estimates. The Company issues restricted stock awards where restrictions lapse upon the passage of time (service vesting), achieving performance targets, or some combination of these restrictions. For those restricted stock awards with only service conditions, the Company recognizes compensation cost on a straight-line basis over the explicit service period. For awards with both performance and service conditions, the Company starts recognizing compensation cost over the remaining service period, when it is probable the performance condition will be met. For stock awards that contain market vesting conditions, the Company recognizes compensation cost of the original estimate of the derived service period, based on its initial valuation analysis regardless of market performance. Stock awards that contain performance or market vesting conditions are excluded from diluted earnings per share computations until the contingency is met as of the end of that reporting period.
Income Taxes	Income Taxes Income taxes are accounted for using the asset and liability method. Deferred income taxes are provided for temporary differences in recognizing certain income, expense and credit items for financial reporting purposes and tax reporting purposes. Such deferred income taxes primarily relate to the difference between the tax basis of assets and liabilities and their financial reporting amounts. Deferred tax assets and liabilities are measured by applying enacted statutory tax rates applicable to the future years in which deferred tax assets or liabilities are expected to be paid or realized. The Company records a valuation allowance when it determines, based on available positive and negative evidence, that it is more-likely-than-not that some portion or all of its deferred tax assets will not be realized. The Company determines the realizability of its deferred tax assets primarily based on the reversal of existing taxable temporary differences and projections of future taxable income (exclusive of reversing temporary differences and carryforwards). In evaluating such projections, the Company considers its history of profitability, the competitive environment, the overall outlook for the online marketing industry and general economic conditions. In addition, the Company considers the time frame over which it would take to utilize the deferred tax assets prior to their expiration. For certain tax positions, the Company uses a more-likely-than-not threshold based on the technical merits of the tax position taken. Tax positions that meet the more-likely-than-not recognition threshold are measured at the largest amount of tax benefits determined on a cumulative probability basis, which are more-likely-than-not to be realized upon ultimate settlement in the financial statements. The Company’s policy is to recognize interest and penalties related to income tax matters in income tax expense.
Earnings Per Share	Earnings Per Share Basic net income/loss per common share excludes dilution for potential common stock issuances and is computed by dividing net income/loss by the weighted-average number of common shares outstanding for the period. Diluted net income/loss per common share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. Diluted earnings per share assumes the exercise of stock options, restricted stock units and warrants using the treasury stock method. The Company reported net income for the three months ending September 30, 2015. The Company's restricted stock awards are participating securities when the Company has net income. As such, the Company has used a two-class method to allocate undistributed earnings between the common stock holders and participating securities to determine the basic and dilutive EPS. The weighted-average shares outstanding-common stock has been adjusted to reflect share repurchases made during the three and nine months ended September 30, 2015. See Footnote 10, Share Repurchases, for more information pertaining to the Company's share repurchases.
Recent Pronouncements	Recent Pronouncements In May 2014, FASB issued ASU 2014-09, Revenue (Topic 606): Revenue from Contracts with Customers, which will replace existing revenue recognition standards and significantly expand the disclosure requirements for revenue arrangements. In August 2015, the FASB deferred by one-year the effective date of the standard to January 1, 2018, with an option that would permit companies to adopt the standard as early as the original effective date of 2017. The Company is currently evaluating the methods of adoption allowed by the new standard and the impact the standard is expected to have on the Company's financial statements and related disclosures. In April 2014, FASB issued ASU 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. This update requires that the disposal of a component of an entity shall be reported in discontinued operations if the disposal represents a strategic shift that will have a major effect on an entity's operations and financial results. This update is effective January 1, 2015 for interim and annual reporting periods. The Company will evaluate the impact of this standard on its consolidated financial statements in the event of a future disposition. In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments (Topic 805): Business Combinations, which requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The standard is effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The guidance is to be applied prospectively to adjustments to provisional amounts that occur after the effective date of the guidance, with earlier application permitted for financial statements that have not been issued. The Company does not expect that the adoption of this ASU will have a significant impact its consolidated financial statements.

Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Schedule of Computing Basic and Diluted Net (Loss) Income Per Common Share

The following table provides a reconciliation of the numerators and denominators used in computing basic and diluted net income (loss) per common share:



	Three Months Ended September 30,					Nine Months Ended September 30,
	2015		2014			2015			2014
	(In thousands, except share and per share data)					(In thousands, except share and per share data)
Net income (loss)	$	961	$	(3,261	)	$	(11,151	)	$	(7,243	)
Net income (loss) per share - common stock:
Basic	$	0.02	$	(0.10	)	$	(0.30	)	$	(0.22	)
Diluted	$	0.02	$	(0.10	)	$	(0.30	)	$	(0.22	)
Weighted-average shares outstanding-common stock, basic	39,174,438		33,502,533			37,586,329			33,550,933
Effect of dilutive securities	648,285		—			—			—
Weighted-average shares outstanding-common stock, diluted	39,822,723		33,502,533			37,586,329			33,550,933

Summary of Common Stock Equivalents for the Securities Outstanding



	Three Months Ended September 30,		Nine Months Ended September 30,
	2015	2014	2015	2014
Stock options, restricted stock units and restricted stock	—	689,327	779,517	749,311

Business Combinations (Tables)

9 Months Ended

Sep. 30, 2015

Business Combinations [Abstract]

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination

The intangible assets are amortized using a straight-line method.



	Fair Value (in thousands)		Useful Lives (Years)
Name and trademarks	$	370	6.0
Panel	1,580		2.0
Intellectual property	840		2.0
Customer relationships	200		7.0
	$	2,990

The following table outlines the fair value of the intangible assets and the useful life for each type of intangible asset. The intangible assets are amortized using a straight-line method.



	Fair Value (in thousands)		Useful Lives (Years)
Name and trademarks	$	190	1.5
Customer relationship	1,700		5.0
Acquired methodologies/technology	2,400		3.0
	$	4,290

Schedule of Business Acquisitions, by Acquisition

The preliminary purchase price of Proximic is allocated as follows (in thousands):



Net tangible assets acquired	$	714
Definite-lived intangible assets acquired	4,290
Goodwill	4,496
Total purchase price, net of cash acquired	$	9,500

Asset Dispositions (Tables)

9 Months Ended

Sep. 30, 2015

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures

As a result of the disposition, the Company recorded a loss on the disposition of $5.2 million, determined as follows (in thousands):



Relief from certain customer obligations	$	3,551
Carrying value of net assets disposed	(6,242		)
	(2,691		)
Cash paid for disposition of business	(2,535		)
Loss on sale of assets	$	(5,226	)

- Definition

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

+ References+ Details

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Value of Goodwill

The change in the carrying value of goodwill for the nine months ended September 30, 2015 is as follows (in thousands):



Balance as of December 31, 2014	$	103,525
Acquisition of Proximic	4,496
Acquisition of European IAM Business	5,303
Translation adjustments	(1,761		)
Balance as of September 30, 2015	$	111,563

Schedule of Acquired Intangible Assets

The carrying values of the Company’s amortizable acquired intangible assets are as follows (in thousands):



	September 30, 2015							December 31, 2014
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Acquired methodologies/technology	$	8,857	$	(6,044	)	$	2,813	$	6,612	$	(5,180	)	$	1,432
Acquired relationship/technology	98,622		(4,931		)	93,691		—		—			—
Customer relationships	19,843		(14,198		)	5,645		19,201		(12,970		)	6,231
Intellectual property	14,396		(6,886		)	7,510		13,562		(5,528		)	8,034
Panel	3,199		(2,003		)	1,196		1,617		(1,521		)	96
Trade names	2,120		(1,645		)	475		1,690		(1,690		)	—
	$	147,037	$	(35,707	)	$	111,330	$	42,682	$	(26,889	)	$	15,793

Weighted Average Remaining Amortization Period

The weighted average remaining amortization period by major asset class as of September 30, 2015, is as follows:



	(In years)
Acquired methodologies/technology	2.7
Acquired relationship/technology	9.5
Customer relationships	2.8
Intellectual property	5.8
Panel	1.5
Trade names	4.2

Estimated Future Amortization of Acquired Intangible Assets

The estimated future amortization of acquired intangible assets as of September 30, 2015 is as follows:



	(In thousands)
2015	$	4,166
2016	16,275
2017	14,360
2018	11,665
2019	10,809
Thereafter	54,055
	$	111,330

Long-term Debt and Other Financing Arrangement (Tables)

9 Months Ended

Sep. 30, 2015

Long-term Debt and Capital Lease Obligations [Abstract]

Schedule of Future Minimum Lease Payments for Capital Leases

In addition, the Company enters into capital leases under non-committed arrangements, typically directly with equipment manufacturers.

Future minimum payments under capital leases with initial terms of one year or more are as follows:



	(In thousands)
2015	$	4,577
2016	15,864
2017	9,343
2018	2,854
2019	51
2020	21
Total minimum lease payments	32,710
Less amount representing interest	(1,657		)
Present value of net minimum lease payments	31,053
Less current portion	(16,380		)
Capital lease obligations, long-term	$	14,673

Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2015

Stockholders' Equity Note [Abstract]

Stock Option Activity

A summary of the Plans is presented below:



	Number of Shares		Weighted- Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Options outstanding at December 31, 2014	1,980,308		$	42.71	9.81	7,359
Options granted	—		—		—	—
Options exercised	(276,064	)	42.10		—	3,013
Options forfeited	—		—		—	—
Options expired	(200	)	4.25		—	—
Options outstanding at September 30, 2015	1,704,044		$	42.82	9.09	5,677
Options exercisable at September 30, 2015	1,704,044		$	42.82	9.09	5,677

Nonvested Stock Awards

A summary of the status for non-vested stock awards as of September 30, 2015 is presented as follows:



Non-vested Stock Awards	Restricted Stock		Restricted Stock Units		Total Number of Shares Underlying Awards		Weighted Average Grant-Date Fair Value
Non-vested at December 31, 2014	476,993		1,410,581		1,887,574		$	26.88
Granted	189,708		297,306		487,014		49.17
Vested	(531,168	)	(754,491	)	(1,285,659	)	32.49
Forfeited	(10,263	)	(81,920	)	(92,183	)	35.03
Non-vested at September 30, 2015	125,270		871,476		996,746		$	29.79

Shares Reserved for Issuance

At September 30, 2015, the Company had reserved for future issuance the following shares of common stock:



Common stock available for future issuances under the Plans	2,535,262
Common stock reserved for outstanding options and restricted stock units	2,575,520
	5,110,782

Share Repurchases (Tables)

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Schedule of cash paid for share repurchases

ded, terminated or modified at any time for any reason. Shares repurchased are classified as Treasury Stock. Details of the share repurchases during the three and nine months ended September 30, 2015 and 2014 under the Company's share repurchase programs were as follows:



	Three Months Ended September 30,		Nine Months Ended September 30,
	2015 (1)	2014 (2)	2015 (1)(2)	2014 (2)(3)
(Amounts in millions, except share and per share data)
Total number of shares repurchased	823,779	16,100	1,949,580	1,253,672
Average price paid per share	$55.78	$36.86	$54.33	$29.42
Total value of shares repurchased (as measured at time of repurchase)	$45.9	$0.6	$105.9	$36.9

(1) May 2015 Share Repurchase Program

(2) June 2014 Share Repurchase Program

(3) June 2013 Share Repurchase Program

Geographic Information (Tables)

9 Months Ended

Sep. 30, 2015

Segments, Geographical Areas [Abstract]

Schedule of Revenues Based on Customer Location

The composition of the Company’s sales to unaffiliated customers between those in the United States and those in other locations for the three and nine months ended September 30, 2015 and 2014 is set forth below:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(In thousands)				(In thousands)
United States	$	67,577	$	57,038	$	197,312	$	167,297
Europe	15,263		14,346		45,953		41,563
Canada	3,821		3,683		10,213		10,376
Other	5,744		7,069		17,670		19,812
Total revenues	$	92,405	$	82,136	$	271,148	$	239,048

Schedule of Composition of the Company's Property and Equipment

The composition of the Company’s property and equipment between those in the United States and those in other countries as of the end of each period is set forth below:



	September 30, 2015		December 31, 2014
	(In thousands)
United States	$	39,522	$	38,240
Europe	5,242		3,375
Canada	134		195
Other	584		555
Total	$	45,482	$	42,365

Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2015

Schedule of Related Party Transactions

The Company has the following balances related to transactions with WPP and its affiliates reflected in the consolidated balance sheet as of September 30, 2015:



	(In thousands)
Accounts receivable	$	1,475
Accounts payable	$	1,279
Deferred revenue	$	545

The Company's results from transactions with WPP and its affiliates for the three and nine months ended September 30, 2015 are set forth below:



	Three Months Ended September 30,		Nine Months Ended September 30,
	2015		2015
	(In thousands)
Revenue	$	1,796	$	4,673	(1)
Expenses	$	1,184	$	2,325	(1)

Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Summary Of Significant Accounting Policies [Line Items]
Percentage of holdings for consolidation			50.00%
Impairment of Intangible Assets, Finite-lived	$ 0	$ 6,942,000	$ 0	$ 6,942,000
Percentage of the estimated fair value of assets surrendered including cash			25.00%
Revenue recognized in nonmonetary transactions	9,100,000	4,600,000	23,700,000	8,600,000
Nonmonetary Transaction, Gross Operating Revenue Recognized, Related Party	2,300,000	1,500,000	6,600,000	4,700,000
Expense related to nonmonetary transactions	5,100,000	2,900,000	14,300,000	7,000,000
Nonmonetary Transaction, Amount of Expense Recognized Related to Timing Difference	$ 2,000,000	$ 2,400,000	$ 6,100,000	$ 5,600,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue Recognition Period			3 months
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue Recognition Period			24 months
Service Arrangements [Member] \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue Recognition Period			2 months
Service Arrangements [Member] \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue Recognition Period			1 year

Summary of Significant Accounting Policies (Schedule of Useful Lives of Finite Lived Intangible Assets) (Detail)	9 Months Ended
	Sep. 30, 2015
Acquired Methodologies/Technology [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	3 years
Acquired Methodologies/Technology [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	7 years
Customer relationships \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	3 years
Customer relationships \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	7 years
Panel
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	7 years
Intellectual Property [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	7 years
Intellectual Property [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	13 years
Trade name \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	2 years
Trade name \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in Years)	10 years

Summary of Significant Accounting Policies (Schedule of Computing Basic and Diluted Net (Loss) Income Per Common Share) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Net loss	$ 961	$ (3,261)	$ (11,151)	$ (7,243)
Net income per share - common stock: Basic (in dollars per share)	$ 0.02	$ (0.10)	$ (0.30)	$ (0.22)
Net income per share - common stock: Diluted (in dollars per share)	$ 0.02	$ (0.10)	$ (0.30)	$ (0.22)
Weighted-average shares outstanding-common stock, basic and dilutive (in shares)	39,174,438	33,502,533	37,586,329	33,550,933

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References+ Details

Summary of Significant Accounting Policies (Summary of Common Stock Equivalents for the Securities Outstanding) (Detail) (Stock Options and Restricted Stock [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock Options and Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities	0	689,327	779,517	749,311

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References+ Details

Business Combinations - Narrative (Details) (USD $)	0 Months Ended	9 Months Ended			0 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended		0 Months Ended		9 Months Ended	0 Months Ended
Business Combinations - Narrative (Details) (USD $)	Aug. 04, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Apr. 01, 2015 Kantur Group's European IAM Business [Member]	Sep. 30, 2015 Kantur Group's European IAM Business [Member]	Apr. 01, 2015 Kantur Group's European IAM Business [Member]	Apr. 23, 2015 Proximic, Inc. [Member]	Sep. 30, 2015 Proximic, Inc. [Member]	Apr. 23, 2015 Proximic, Inc. [Member]	Apr. 01, 2015 WPP Kantur Group's European IAM Business [Member]	Apr. 01, 2015 WPP Kantur Group's European IAM Business [Member]	Sep. 30, 2015 Common Stock [Member]	Apr. 01, 2015 Common Stock [Member] Kantur Group's European IAM Business [Member]	Apr. 01, 2015 Contractual Rights [Member] WPP Kantur Group's European IAM Business [Member]	Apr. 01, 2015 Contractual Rights [Member] WPP Kantur Group's European IAM Business [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 4,500,000
Minimum Shares outstanding Percentage of Tender												15.00%
Reissuance of treasury stock (shares)													1,605,330	1,605,330
Shares issued, percentage of outstanding common stock														4.45%
Reissuance of treasury stock		82,543,000												82,500,000
Tender Offer Share Price							$ 46.13
Number of shares											4,438,353
Purchase price											204,700,000
Difference between fair market value of the shares issued and the tender offer prices											23,600,000
Value of stock issued					310,800,000
Shares issued					6,043,683
Net tangible assets acquired										714,000		8,500,000
Fair value of intangible assets acquired										4,290,000						98,600,000
Business Acquisition, Transaction Costs						1,900,000	3,400,000		400,000							1,000,000
Proceeds from the issuance of common stock		204,741,000	0		201,300,000
Goodwill		111,563,000		103,525,000
Intangible assets acquired					2,990,000			4,290,000
Net tangible assets acquired							100,000
Useful life of intangible assets acquired (in years)															10 years
Percentage common stock outstanding shares		4.00%									15.00%
Total purchase price, net of cash acquired								9,500,000
Goodwill from acquisitions						$ 5,303,000			$ 4,496,000

Business Combinations - Acquired Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	9 Months Ended	0 Months Ended				9 Months Ended	0 Months Ended
	Apr. 23, 2015 Proximic, Inc. [Member]	Sep. 30, 2015 Proximic, Inc. [Member]	Apr. 23, 2015 Proximic, Inc. [Member] Name and trademarks	Apr. 23, 2015 Proximic, Inc. [Member] Customer relationships	Apr. 23, 2015 Proximic, Inc. [Member] Acquired methodologies/technology	Apr. 01, 2015 Kantur Group's European IAM Business [Member]	Sep. 30, 2015 Kantur Group's European IAM Business [Member]	Apr. 01, 2015 Kantur Group's European IAM Business [Member] Name and trademarks	Apr. 01, 2015 Kantur Group's European IAM Business [Member] Panel	Apr. 01, 2015 Kantur Group's European IAM Business [Member] Intellectual property	Apr. 01, 2015 Kantur Group's European IAM Business [Member] Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill from acquisitions		$ 4,496					$ 5,303
Intangible assets acquired	$ 4,290		$ 190	$ 1,700	$ 2,400	$ 2,990		$ 370	$ 1,580	$ 840	$ 200
Useful life of intangible assets acquired (in years)			1 year 6 months	5 years	3 years			6 years	2 years	2 years	7 years

Business Combinations - Allocation Table (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Apr. 23, 2015 Proximic, Inc. [Member]	Sep. 30, 2015 Proximic, Inc. [Member]	Apr. 23, 2015 Proximic, Inc. [Member]
Business Acquisition [Line Items]
Net tangible assets acquired					$ 714
Definite-lived intangible assets acquired					4,290
Goodwill from acquisitions				4,496
Goodwill	111,563	103,525
Total purchase price, net of cash acquired			$ 9,500

Asset Dispositions (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended
Asset Dispositions (Details) (USD $)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2015 CSWS [Member]	May 11, 2015 CSWS [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount available for borrowings under the loan and security agreement							$ 1,500,000.0
Annual reductions to the amount available for borrowings under the loan and security agreemen							500,000.0
Relief from certain customer obligations	0		0		3,873,000	3,551,000
Carrying value of net assets disposed						(6,242,000)
Net obligation related to assets disposed						(2,691,000)
Cash due to buyer related to disposition of business						(500,000)
Cash paid for disposition of business			(2,535,000)	0		(2,535,000)
Loss on sale of assets	$ 0	$ 0	$ (5,226,000)	$ 0		$ (5,226,000)

Goodwill and Intangible Assets (Carrying Value of Goodwill) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2015
Goodwill [Roll Forward]
Balance as of December 31, 2014	$ 103,525
Translation adjustments	(1,761)
Balance as of September 30, 2015	111,563
Proximic, Inc. [Member]
Goodwill [Roll Forward]
Goodwill from acquisitions	4,496
Kantur Group's European IAM Business [Member]
Goodwill [Roll Forward]
Goodwill from acquisitions	$ 5,303

Goodwill and Intangible Assets (Schedule of Acquired Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Gross Carrying Amount	$ 147,037	$ 42,682
Accumulated Amortization	(35,707)	(26,889)
Net Carrying Amount	111,330	15,793
Acquired Methodologies/Technology [Member]
Goodwill [Line Items]
Gross Carrying Amount	8,857	6,612
Accumulated Amortization	(6,044)	(5,180)
Net Carrying Amount	2,813	1,432
Acquired Relationship / Technology [Member]
Goodwill [Line Items]
Gross Carrying Amount	98,622	0
Accumulated Amortization	(4,931)	0
Net Carrying Amount	93,691	0
Customer relationships
Goodwill [Line Items]
Gross Carrying Amount	19,843	19,201
Accumulated Amortization	(14,198)	(12,970)
Net Carrying Amount	5,645	6,231
Panel
Goodwill [Line Items]
Gross Carrying Amount	3,199	1,617
Accumulated Amortization	(2,003)	(1,521)
Net Carrying Amount	1,196	96
Intellectual Property [Member]
Goodwill [Line Items]
Gross Carrying Amount	14,396	13,562
Accumulated Amortization	(6,886)	(5,528)
Net Carrying Amount	7,510	8,034
Trade name
Goodwill [Line Items]
Gross Carrying Amount	2,120	1,690
Accumulated Amortization	(1,645)	(1,690)
Net Carrying Amount	$ 475	$ 0

Goodwill and Intangible Assets (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived Intangible Assets, Fair Value Disclosure		$ 2,800,000		$ 2,800,000
Amortization expense related to intangible assets	4,220,000	1,912,000	9,904,000	5,786,000
Impairment of Intangible Assets, Finite-lived	$ 0	$ 6,942,000	$ 0	$ 6,942,000
Decrease In Basic Earnings Per Share				$ 0.21

Goodwill and Intangible Assets (Weighted Average Remaining Amortization Period) (Detail)	9 Months Ended
	Sep. 30, 2015
Acquired Methodologies/Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average remaining amortization period	2 years 8 months
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average remaining amortization period	2 years 9 months
Intellectual property
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average remaining amortization period	5 years 9 months
Panel
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average remaining amortization period	1 year 6 months
Intellectual Property [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average remaining amortization period	9 years 6 months
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average remaining amortization period	4 years 2 months

Goodwill and Intangible Assets (Estimated Future Amortization of Acquired Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$ 4,166
2016	16,275
2017	14,360
2018	11,665
2019	10,809
Thereafter	54,055
Net Carrying Amount	$ 111,330	$ 15,793

Long-term Debt and Other Financing Arrangement (Narrative) (Detail) (USD $)			9 Months Ended							0 Months Ended
	Sep. 30, 2015	Jun. 23, 2014	Sep. 30, 2015 Computer Equipment [Member]	Sep. 30, 2014 Computer Equipment [Member]	Sep. 30, 2015 Letter of Credit [Member]	Sep. 26, 2013 Line of Credit [Member] Bank of America Revolving Credit Facility [Member]	Sep. 26, 2013 Line of Credit [Member] Bank of America Standby Letters of Credit [Member]	Sep. 26, 2013 Line of Credit [Member] Bank of America Swing Line [Member]	Sep. 26, 2013 Line of Credit [Member] Bank of America Alternative Currency Lending [Member]	Sep. 26, 2013 Fed Funds Rate [Member] Line of Credit [Member] Bank of America Revolving Credit Facility [Member]	Sep. 26, 2013 Eurocurrency Rate [Member] Line of Credit [Member] Bank of America Revolving Credit Facility [Member]	Sep. 26, 2013 Applicable Rate [Member] Line of Credit [Member] Bank of America Revolving Credit Facility [Member] Minimum [Member]	Sep. 26, 2013 Applicable Rate [Member] Line of Credit [Member] Bank of America Revolving Credit Facility [Member] Maximum [Member]	Sep. 26, 2013 Applicable Rate [Member] Line of Credit [Member] Bank of America Base Rate and Swing Lines [Member] Minimum [Member]	Sep. 26, 2013 Applicable Rate [Member] Line of Credit [Member] Bank of America Base Rate and Swing Lines [Member] Maximum [Member]	Sep. 26, 2013 Applicable Rate [Member] Line of Credit [Member] Bank of America Eurocurrency Rate Loan [Member] Minimum [Member]	Sep. 26, 2013 Applicable Rate [Member] Line of Credit [Member] Bank of America Eurocurrency Rate Loan [Member] Maximum [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Capital lease financing amount	$ 10,000,000
Utilization of capital lease	7,200,000
Asset acquired through issuance of capital leases			16,500,000	10,900,000
Revolving credit facility, maximum borrowing capacity						100,000,000.0	10,000,000.0	10,000,000	10,000,000.0
Higher borrowing capacity option						50,000,000
Line of Credit Facility, Equity Repurchase Limit		50,000,000
Interest rate										0.50%	1.00%			0.50%	1.50%	1.50%	2.50%
Commitment fee percentage												0.20%	0.35%
Letters of credit outstanding	3,500,000
Line of Credit Facility, Remaining Borrowing Capacity					$ 6,500,000

Long-term Debt and Other Financing Arrangement (Schedule of Future Minimum Payments for Capital Leases) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015	Dec. 31, 2014
Long-term Debt and Capital Lease Obligations [Abstract]
2015	$ 4,577
2016	15,864
2017	9,343
2018	2,854
2019	51
Capital Leases, Future Minimum Payments Due Thereafter	21
Total minimum lease payments	32,710
Less amount representing interest	(1,657)
Present value of net minimum lease payments	31,053
Less current portion	(16,380)	(13,353)
Capital lease obligations, long-term	$ 14,673	$ 13,072

Income Taxes (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Narrative) (Detail) (USD $)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
Income tax provision (benefit)	$ (40,000)	$ (2,555,000)	$ (324,000)	$ (1,952,000)
Effective tax rate	(4.30%)	43.90%	2.80%	21.20%
Federal statutory rate			35.00%
Unrecognized tax benefits which impact effective tax rate	1,400,000		1,400,000		1,400,000
Unrecognized Tax Benefits, Net Against Deferred Tax Assets	$ 900,000		$ 900,000		$ 900,000

Stockholders' Equity (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			12 Months Ended	0 Months Ended	12 Months Ended
Stockholders' Equity (Narrative) (Detail) (USD $)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2015 1999 Stock Option Plan And 2007 Equity Incentive Plan [Member]	Dec. 31, 2014 1999 Stock Option Plan And 2007 Equity Incentive Plan [Member]	Sep. 30, 2015 2007 Equity Incentive Plan [Member]	Sep. 30, 2015 Restricted Stock [Member]	Sep. 30, 2015 Restricted Stock [Member]	Sep. 30, 2015 Restricted Stock And Restricted Stock Units [Member]	Dec. 31, 2014 Restricted Stock And Restricted Stock Units [Member]	Dec. 31, 2014 Executive Officer [Member]	Nov. 07, 2014 Management [Member]	Dec. 31, 2014 Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic Value, Options exercised	$ 100,000	$ 0.6	$ 3,013,000	$ 0.7
Number of shares authorized (in shares)	1,800,000		1,800,000			12,700,000.0	11,400,000
Percentage common stock outstanding shares			4.00%
Vesting period of options granted, in years			4 years
Options expiration period from date of grant, in years			10 years
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)						1,366,979
Shares available for grant (in shares)								2,535,262
Number of shares eligible to vest for three years (in shares)			487,014							189,708
Right of repurchase of shares awarded, lapse rate			(25.00%)
Aggregate intrinsic value for non-vested shares					44,700,000
Total unrecognized compensation expense	0		0									23,100,000
Weighted-average period expected to recognize compensation expense (in years)											1 year 0 months 15 days
Restricted stock units vested (in shares)			1,285,659						129,170	531,168
Total number of shares repurchased	823,779	16,100	1,949,580	1,253,672
Stock Repurchased and Retired During Period, Shares									500
Aggregate Intrinsic Value, Options outstanding	5,677,000		5,677,000		7,359,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	5,677,000		5,677,000
Weighted Average Remaining Contractual Term, Options outstanding (in years)			9 years 0 months 32 days		9 years 9 months 22 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			9 years 0 months 32 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross													1,969,453		283,356
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share)			$ 35.03											$ 42.92
Shares Paid for Tax Withholding for Share Based Compensation									48,226
Adjustments Related to Tax Withholding for Share-based Compensation									$ 2,600,000

Stockholders' Equity (Stock Option Activity) (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning balance			1,980,308
Options granted (in shares)			0
Options exercised (in shares)			(276,064)
Options forfeited (in shares)			0
Options expired (in shares)			(200)
Options outstanding, ending balance	1,704,044		1,704,044		1,980,308
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Options outstanding beginning balance (in dollars per share)			$ 42.71
Weighted-Average Exercise Price, Options granted (in dollars per share)			$ 0.00
Weighted-Average Exercise Price, Options exercised (in dollars per share)			$ 42.10
Weighted-Average Exercise Price, Options forfeited (in dollars per share)			$ 0.00
Weighted-Average Exercise Price, Options expired (in dollars per share)			$ 4.25
Weighted-Average Exercise Price, Options outstanding ending balance (in dollars per share)	$ 42.82		$ 42.82		$ 42.71
Weighted Average Remaining Contractual Term, Options outstanding (in years)			9 years 0 months 32 days		9 years 9 months 22 days
Aggregate Intrinsic Value, Options exercised	$ 100,000	$ 0.6	$ 3,013,000	$ 0.7
Aggregate Intrinsic Value, Options outstanding	5,677,000		5,677,000		7,359,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,704,044		1,704,044
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 42.82		$ 42.82
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			9 years 0 months 32 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 5,677,000		$ 5,677,000

Stockholders' Equity (Nonvested Stock Awards) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended	9 Months Ended			0 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015 Restricted Stock [Member]	Sep. 30, 2015 Restricted Stock Unit [Member]	Sep. 30, 2015 Restricted Stock And Restricted Stock Units [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche One [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche One [Member] Employee Stock Option [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche One [Member] Restricted Stock Units (RSUs) [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Two [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Two [Member] Employee Stock Option [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Two [Member] Restricted Stock Units (RSUs) [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Three [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Three [Member] Employee Stock Option [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Three [Member] Restricted Stock Units (RSUs) [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Four [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Four [Member] Employee Stock Option [Member]	Nov. 07, 2014 Share-based Compensation Award, Tranche Four [Member] Restricted Stock Units (RSUs) [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding					$ 7.7
Percentage of Shares that Vest Based on Exceeding Market Average Share Price							66.00%	48.00%		10.00%	10.00%		14.00%	22.00%		10.00%	20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested Stock Awards, Beginning balance (in shares)	1,887,574		476,993	1,410,581
Nonvested Stock Awards, Shares Granted (in shares)	487,014		189,708	297,306
Nonvested Stock Awards, Shares Vested (in shares)	(1,285,659)		(531,168)	(754,491)
Nonvested Stock Awards, Shares Forfeited (in shares)	(92,183)		(10,263)	(81,920)
Nonvested Stock Awards Shares, Ending balance (in shares)	996,746	1,887,574	125,270	871,476
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant-Date Fair Value, Beginning balance (in dollars per share)	$ 26.88
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)	$ 49.17
Weighted Average Grant-Date Fair Value, Vested (in dollars per share)	$ 32.49
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share)	$ 35.03
Weighted Average Grant-Date Fair Value, Ending balance (in dollars per share)	$ 29.79	$ 26.88
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		34.11%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		0.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		3 years
Share Price Average, Minimum over Period							$ 48			$ 50			$ 55			$ 60
Period for Share Price Average Required for Shares to Vest						30 days			30 days			30 days			30 days
Share Price Increase Target Percentage						25.00%

Share Repurchases (Details) (USD $)	3 Months Ended		9 Months Ended			11 Months Ended		12 Months Ended
Share Repurchases (Details) (USD $)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	May 05, 2015 May 2015 Share Repurchase Program [Member]	May 05, 2015 June 2014 Share Repurchase Program [Member]	Jun. 05, 2014 June 2014 Share Repurchase Program [Member]	May 29, 2014 June 2013 Share Repurchase Program [Member]	Jun. 03, 2013 June 2013 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total number of shares repurchased	823,779	16,100	1,949,580	1,253,672
Average price paid per share (in dollars per share)	$ 55.78	$ 36.86	$ 54.33	$ 29.42
Total value of shares repurchased (as measured at time of repurchase)	$ 45,900,000	$ 600,000	$ 105,916,000	$ 36,886,000
Stock Repurchase Program, Authorized Amount					150,000,000.0		50,000,000.0		50,000,000
Stock Repurchased During Period, Value			$ 105,916,000	$ 36,886,000		$ 6,900,000		$ 49,400,000

Geographic Information (Composition of Company's Property and Equipment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule Of Geographical Information [Line Items]
Total Revenues	$ 92,405	$ 82,136	$ 271,148	$ 239,048
Total	45,482		45,482		42,365
UNITED STATES
Schedule Of Geographical Information [Line Items]
Total Revenues	67,577	57,038	197,312	167,297
Total	39,522		39,522		38,240
Europe [Member]
Schedule Of Geographical Information [Line Items]
Total Revenues	15,263	14,346	45,953	41,563
Total	5,242		5,242		3,375
CANADA
Schedule Of Geographical Information [Line Items]
Total Revenues	3,821	3,683	10,213	10,376
Total	134		134		195
Other [Member]
Schedule Of Geographical Information [Line Items]
Total Revenues	5,744	7,069	17,670	19,812
Total	$ 584		$ 584		$ 555

Related Party Transactions (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended
Related Party Transactions (Details) (USD $)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2015 WPP Corporate Joint Venture [Member]	Sep. 30, 2015 WPP Corporate Joint Venture [Member]	Apr. 01, 2015 WPP Kantur Group's European IAM Business [Member]	Sep. 30, 2015 WPP Kantur Group's European IAM Business [Member] Corporate Joint Venture [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties	$ 1,475,000		$ 1,475,000
Common stock, shares outstanding (in shares)	0		0		34,174,466				6,043,683
Percentage common stock outstanding shares			4.00%					15.00%	16.00%
Revenue						1,796,000	4,673,000
Expenses						1,184,000	2,325,000
Revenue recognized in nonmonetary transactions	9,100,000	4,600,000	23,700,000	8,600,000
Nonmonetary Transaction, Gross Operating Revenue Recognized, Related Party	2,300,000	1,500,000	6,600,000	4,700,000
Expense related to nonmonetary transactions	(5,100,000)	(2,900,000)	(14,300,000)	(7,000,000)
Nonmonetary Transaction, Amount of Expense Recognized Related to Timing Difference	2,000,000	2,400,000	6,100,000	5,600,000
Accounts Payable, Related Parties	1,279,000		1,279,000
Deferred Revenue	$ 545,000		$ 545,000

Stockholders' Equity (Shares Reserved for Issuance) (Detail)	Sep. 30, 2015
Schedule Of Stock Options [Line Items]
Common stock reserved for future issuance	5,110,782
Stock Under Plans [Member]
Schedule Of Stock Options [Line Items]
Common stock reserved for future issuance	2,535,262
Stock Options And Restricted Stock Units [Member]
Schedule Of Stock Options [Line Items]
Common stock reserved for future issuance	2,575,520

Subsequent Event Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	Nov. 05, 2015
Subsequent Events [Abstract]
Business Combination, Contingent Consideration, Asset	$ 45