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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2015	May 04, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	FORR
Entity Registrant Name	FORRESTER RESEARCH, INC.
Entity Central Index Key	0001023313
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,028,000

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 50,168	$ 49,650
Marketable investments (Note 3)	60,832	54,885
Accounts receivable, net	50,000	67,429
Deferred commissions	12,969	13,754
Prepaid expenses and other current assets	27,495	22,277
Total current assets	201,464	207,995
Property and equipment, net	30,571	32,174
Goodwill	74,037	76,683
Intangible assets, net	2,995	3,382
Other assets	11,993	12,473
Total assets	321,060	332,707
Current Liabilities:
Accounts payable	857	912
Accrued expenses and other current liabilities	27,174	36,217
Deferred revenue	150,417	144,568
Total current liabilities	178,448	181,697
Non-current liabilities	9,391	9,408
Total liabilities	187,839	191,105
Commitments
Stockholders' Equity (Note 7):
Preferred stock, $0.01 par value Authorized - 500 shares, issued and outstanding - none
Common stock, $0.01 par value Authorized - 125,000 shares Issued - 20,901 and 20,856 as of March 31, 2015 and December 31, 2014, respectively Outstanding 18,047 and 18,153 as of March 31, 2015 and December 31, 2014, respectively	209	209
Additional paid-in capital	128,479	124,942
Retained earnings	114,025	117,318
Treasury stock - 2,854 and 2,703 as of March 31, 2015 and December 31, 2014, respectively, at cost	(104,977)	(99,254)
Accumulated other comprehensive loss	(4,515)	(1,613)
Total stockholders' equity	133,221	141,602
Total liabilities and stockholders' equity	$ 321,060	$ 332,707

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	20,901,000	20,856,000
Common stock, shares outstanding	18,047,000	18,153,000
Treasury stock, shares	2,854,000	2,703,000

Consolidated Statements of Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Research services	$ 51,858	$ 50,793
Advisory services and events	23,329	22,278
Total revenues	75,187	73,071
Operating expenses:
Cost of services and fulfillment	30,761	29,480
Selling and marketing	29,631	29,883
General and administrative	9,758	9,527
Depreciation	2,107	2,773
Amortization of intangible assets	221	539
Reorganization costs	3,424	849
Total operating expenses	75,902	73,051
Income (loss) from operations	(715)	20
Other income (expense), net	282	(64)
Gains (losses) on investments, net	(19)	37
Loss before income taxes	(452)	(7)
Income tax provision (benefit)	(228)	59
Net loss	$ (224)	$ (66)
Basic loss per common share	$ (0.01)
Diluted loss per common share	$ (0.01)
Basic weighted average common shares outstanding	18,058	19,613
Diluted weighted average common shares outstanding	18,058	19,613
Cash dividends declared per common share	$ 0.17	$ 0.16

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (224)	$ (66)
Other comprehensive income (loss), net of taxes:
Foreign currency translation	(3,000)	45
Net change in market value of investments	98	11
Other comprehensive income (loss)	(2,902)	56
Comprehensive loss	$ (3,126)	$ (10)

- Definition

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

+ References + Details

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (224)	$ (66)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	2,107	2,773
Amortization of intangible assets	221	539
Net (gains) losses from investments	19	(37)
Deferred income taxes	109	(132)
Stock-based compensation	2,186	1,947
Amortization of premium on investments	187	391
Foreign currency (gains) losses	(166)	245
Changes in assets and liabilities
Accounts receivable	16,802	28,310
Deferred commissions	785	(72)
Prepaid expenses and other current assets	(5,449)	(2,934)
Accounts payable	(13)	137
Accrued expenses and other liabilities	(7,984)	(4,871)
Deferred revenue	7,702	6,774
Net cash provided by operating activities	16,282	33,004
Cash flows from investing activities:
Purchases of property and equipment	(948)	(680)
Purchases of marketable investments	(14,552)	(20,046)
Proceeds from sales and maturities of marketable investments	8,578	23,934
Other investing activity	204	1,391
Net cash provided by (used in) investing activities	(6,718)	4,599
Cash flows from financing activities:
Dividends paid on common stock	(3,069)	(3,135)
Repurchases of common stock	(5,723)	(29,712)
Proceeds from issuance of common stock under employee equity incentive plans	1,349	1,556
Excess tax benefits from stock-based compensation	20	22
Net cash used in financing activities	(7,423)	(31,269)
Effect of exchange rate changes on cash and cash equivalents	(1,623)	35
Net increase in cash and cash equivalents	518	6,369
Cash and cash equivalents, beginning of period	49,650	74,132
Cash and cash equivalents, end of period	$ 50,168	$ 80,501

Interim Consolidated Financial Statements	3 Months Ended
Interim Consolidated Financial Statements	Mar. 31, 2015
Accounting Policies [Abstract]
Interim Consolidated Financial Statements	Note 1 — Interim Consolidated Financial Statements Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for reporting on Form 10-Q. Accordingly, certain information and footnote disclosures required for complete financial statements are not included herein. The year-end balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. It is recommended that these financial statements be read in conjunction with the consolidated financial statements and related notes that appear in the Forrester Research, Inc. (“Forrester”) Annual Report on Form 10-K for the year ended December 31, 2014. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the financial position, results of operations, comprehensive loss and cash flows as of the dates and for the periods presented have been included. The results of operations for the three months ended March 31, 2015 may not be indicative of the results for the year ending December 31, 2015, or any other period. Fair Value Measurements The carrying amounts reflected in the Consolidated Balance Sheets for cash and cash equivalents, accounts receivable, accounts payable, and accrued expenses approximate fair value due to their short-term maturities. See Note 3 – Marketable Investments for the fair value of the Company’s marketable investments.

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Note 2 — Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income (loss) are as follows (in thousands):


	Net Unrealized Gain (Loss) on Marketable Investments			Cumulative Translation Adjustment			Total Accumulated Other Comprehensive Income (Loss)
Balance at January 1, 2015	$	(74	)	$	(1,539	)	$	(1,613	)
Foreign currency translation		—			(3,000	)		(3,000	)
Unrealized loss on investments, net of tax of $62		98			—			98

Balance at March 31, 2015	$	24		$	(4,539	)	$	(4,515	)


	Net Unrealized Gain (Loss) on Marketable Investments		Cumulative Translation Adjustment		Total Accumulated Other Comprehensive Income (Loss)
Balance at January 1, 2014	$	16	$	2,438	$	2,454
Foreign currency translation		—		45		45
Unrealized gain on investments before reclassification, net of tax of $0		6		—		6
Reclassification adjustment for net loss realized in net loss, net of tax of $0		5		—		5

Balance at March 31, 2014	$	27	$	2,483	$	2,510

Reclassification adjustments for net gains (losses) are reported in gains (losses) on investments, net in the Consolidated Statements of Income (Loss).

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

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+ Details

Marketable Investments

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Marketable Investments

Note 3 — Marketable Investments

The following table summarizes the Company’s marketable investments (in thousands):


	As of March 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value

Corporate obligations	$	60,792	$	56	$	(16	)	$	60,832


	As of December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value

Corporate obligations	$	55,005	$	13	$	(133	)	$	54,885

Realized gains and losses on securities are included in earnings and are determined using the specific identification method. Realized gains or losses on the sale of the Company’s corporate obligations were not material in the three months ended March 31, 2015 or 2014.

The following table summarizes the maturity periods of the marketable securities in the Company’s portfolio as of March 31, 2015 (in thousands).


	FY 2015		FY 2016		FY 2017		Thereafter		Total
Corporate obligations	$	12,432	$	24,575	$	22,819	$	1,006	$	60,832

The following table shows the gross unrealized losses and market value of Forrester’s available-for-sale securities with unrealized losses that are not deemed to be other-than-temporary, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):


	As of March 31, 2015
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses

Corporate obligations	$	15,235	$	12	$	2,053	$	4


	As of December 31, 2014
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses

Corporate obligations	$	38,175	$	133	$	—	$	—

Fair Value

The Company measures certain financial assets at fair value on a recurring basis, including cash equivalents and available-for-sale securities. The fair values of these financial assets have been classified as Level 1, 2 or 3 within the fair value hierarchy as described in the accounting standards for fair value measurements.

Level 1 — Fair value based on quoted prices in active markets for identical assets or liabilities.

Level 2 — Fair value based on inputs other than Level 1 inputs that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 — Fair value based on unobservable inputs that are supported by little or no market activity and such inputs are significant to the fair value of the assets or liabilities.

The following table represents the Company’s fair value hierarchy for its financial assets (cash equivalents and investments) measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014 (in thousands):


	As of March 31, 2015
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	845	$	—	$	—	$	845
Corporate obligations		—		60,832		—		60,832

Total	$	845	$	60,832	$	—	$	61,677


	As of December 31, 2014
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	1,794	$	—	$	—	$	1,794
Corporate obligations		—		54,885		—		54,885

Total	$	1,794	$	54,885	$	—	$	56,679

(1)	Included in cash and cash equivalents.

Level 2 assets consist of the Company’s entire portfolio of corporate bonds. Level 2 assets have been initially valued at the transaction price and subsequently valued, at the end of each reporting period, typically utilizing third party pricing services or other market observable data. The pricing services utilize industry standard valuation methods, including both income and market based approaches and observable market inputs to determine value. These observable market inputs include reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Non-Marketable Investments	3 Months Ended
Non-Marketable Investments	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Non-Marketable Investments	Note 4 — Non-Marketable Investments At March 31, 2015 and December 31, 2014, the carrying value of the Company’s non-marketable investments, which were composed primarily of interests in technology-related private equity funds, was $3.7 million and $3.8 million, respectively, and is included in other assets in the Consolidated Balance Sheets. One of the Company’s investments, with a book value of $0.6 million and $0.7 million at March 31, 2015 and December 31, 2014, respectively, is being accounted for using the cost method and, accordingly, is valued at cost unless an other-than-temporary impairment in its value occurs. The other investments are being accounted for using the equity method as the investments are limited partnerships and the Company has an ownership interest in excess of 5% and, accordingly, the Company records its share of the investee’s operating results each period. Gains and losses from non-marketable investments were insignificant during the three months ended March 31, 2015 and 2014, and are included in gains (losses) on investments, net in the Consolidated Statements of Income (Loss). During the three months ended March 31, 2015 and 2014, gross distributions of $0.1 million and $1.4 million, respectively, were received from the funds.

Reorganization

3 Months Ended

Mar. 31, 2015

Restructuring and Related Activities [Abstract]

Reorganization

Note 5 — Reorganization

In the first quarter of 2015, the Company implemented a reduction in its workforce of approximately 4% of its employees across various geographies and functions, in order to reallocate investment in 2015 to planned sales expansion and to delivery areas seeing the greatest client demand. Overall the Company expects to increase its headcount by 7% at the end of 2015 compared to 2014 levels. The Company incurred $3.4 million of severance and related costs for this action during the three months ended March 31, 2015 and expects to incur an additional $0.3 million to $0.5 million during the three months ended June 30, 2015 primarily for a non-cash charge for the liquidation of a small non-U.S. subsidiary. The costs under this plan are expected to be substantially paid by the end of 2015.

During 2014 the Company incurred $1.8 million of severance and related costs for the termination of approximately 1% of its employees across various geographies and functions primarily to realign resources due to the Company’s new organizational structure put in place in late 2013. Approximately $0.8 million of the costs were recognized in the three months ended March 31, 2014 and approximately $1.0 million were recognized in the three months ended June 30, 2014.

The following table rolls forward the activity in the reorganization accrual for the three months ended March 31, 2015 (in thousands):


	Workforce Reduction
Accrual at December 31, 2014	$	118
Additions		3,424
Cash payments		(1,046	)

Accrual at March 31, 2015	$	2,496

Net Loss Per Common Share

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Net Loss Per Common Share

Note 6 — Net Loss Per Common Share

Basic net loss per common share is computed by dividing net loss by the basic weighted average number of common shares outstanding during the period. Diluted net loss per common share is computed by dividing net loss by the diluted weighted average number of common shares and common equivalent shares outstanding during the period. The weighted average number of common equivalent shares outstanding has been determined in accordance with the treasury-stock method. Common equivalent shares consist of common stock issuable on the exercise of outstanding options and vesting of restricted stock units when dilutive.

Basic and diluted weighted average common shares are as follows (in thousands):


	Three Months Ended March 31,
	2015		2014

Basic weighted average common shares outstanding		18,058		19,613
Weighted average common equivalent shares		—		—

Diluted weighted average common shares outstanding		18,058		19,613

Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive		2,052		2,080

Stockholders' Equity

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Stockholders' Equity

Note 7 — Stockholders’ Equity

Equity Plans

Stock option activity for the three months ended March 31, 2015 is presented below (in thousands, except per share data):


	Number of Shares			Weighted - Average Exercise Price Per Share		Weighted - Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value

Outstanding at December 31, 2014		1,954		$	33.81
Granted		44			38.64
Exercised		(20	)		28.58
Forfeited		(55	)		36.46

Outstanding at March 31, 2015		1,923		$	33.90		6.88	$	6,536

Exercisable at March 31, 2015		875		$	30.66		4.90	$	5,452

Vested and expected to vest at March 31, 2015		1,822		$	33.72		6.77	$	6,466

Restricted stock unit activity for the three months ended March 31, 2015 is presented below (in thousands, except per share data):


	Number of Shares			Weighted- Average Grant Date Fair Value
Unvested at December 31, 2014		433		$	35.64
Granted		5			36.43
Vested		—			—
Forfeited		(21	)		35.61

Unvested at March 31, 2015		417		$	35.65

Stock-Based Compensation

Forrester recognizes the fair value of stock-based compensation in net income (loss) over the requisite service period of the individual grantee, which generally equals the vesting period. Stock-based compensation was recorded in the following expense categories (in thousands):


	Three Months Ended March 31,
	2015		2014
Cost of services and fulfillment	$	1,237	$	1,073
Selling and marketing		334		338
General and administrative		615		536

Total	$	2,186	$	1,947

Forrester utilizes the Black-Scholes valuation model for estimating the fair value of stock options. Options granted under the equity incentive plans and shares subject to purchase under the employee stock purchase plan were valued using the following assumptions:


	Three Months Ended March 31, 2015						Three Months Ended March 31, 2014
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		1.37	%		0.11	%		1.65	%		0.08	%
Expected dividend yield		1.8	%		1.8	%		1.8	%		1.8	%
Expected life		5.1 Years			0.5 Years			5.1 Years			0.5 Years
Expected volatility		25	%		22	%		30	%		25	%
Weighted average fair value	$	7.48		$	7.93		$	8.79		$	7.81

Dividends

In the three months ended March 31, 2015, the Company declared and paid a dividend of $0.17 per share or $3.1 million in the aggregate. In the three months ended March 31, 2014, the Company declared and paid a dividend of $0.16 per share or $3.1 million in the aggregate. In April 2015, the Company declared a dividend of $0.17 per share payable on June 24, 2015 to shareholders of record as of June 10, 2015.

Treasury Stock

Forrester’s Board of Directors has authorized an aggregate $435.0 million to purchase common stock under its stock repurchase program, including $25.0 million authorized in February 2015. The shares repurchased may be used, among other things, in connection with Forrester’s employee and director equity incentive and purchase plans. In the three months ended March 31, 2015 and 2014, the Company repurchased approximately 0.2 million shares and 0.8 million shares, respectively, of common stock at an aggregate cost of approximately $5.7 million and $29.7 million, respectively. From the inception of the program through March 31, 2015, Forrester repurchased approximately 14.5 million shares of common stock at an aggregate cost of approximately $407.9 million.

- 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.

+ References

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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Note 8 — Income Taxes Forrester provides for income taxes on an interim basis according to management’s estimate of the effective tax rate expected to be applicable for the full fiscal year. Certain items such as changes in tax rates and tax benefits related to disqualifying dispositions of incentive stock options are treated as discrete items and are recorded in the period in which they arise. Income tax expense (benefit) for the three months ended March 31, 2015 was $(0.2) million resulting from a loss before income taxes of $0.5 million for the period. Income tax expense (benefit) for the three months ended March 31, 2014 was insignificant as the loss before income taxes was only $(7,000) for the period.

Operating Segments

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Operating Segments

Note 9 — Operating Segments

The Research segment includes the costs of the Company’s research personnel who are responsible for writing the research and performing the webinars and inquiries for the Company’s RoleView product. In addition, the research personnel deliver advisory services (such as workshops, speeches and advisory days) and a portion of the Company’s project consulting services. Revenue in this segment includes only revenue from advisory services and project consulting services that are delivered by the research personnel in this segment. During 2013, the Company began to transition the delivery of project consulting to a dedicated project consulting organization. The transition was essentially complete at the end of 2014 such that the vast majority of project consulting will be delivered by the project consulting organization in 2015.

The Product segment includes the costs of the product management organization that is responsible for product pricing and packaging and the launch of new products. In addition, this segment includes the costs of the Company’s data, Forrester Leadership Boards and events organizations. Revenue in this segment includes all revenue for the Company (including RoleView) except for revenue from advisory services and project consulting services that are delivered by personnel in the Research and Project Consulting segments.

The Project Consulting segment includes the costs of the consultants that deliver the Company’s project consulting services. During 2013 the Company began to hire dedicated consultants to transition the delivery of project consulting services from research personnel (included in the Research segment) to the new Project Consulting segment. Revenue in this segment includes the project consulting revenue delivered by the consultants in this segment.

The Company evaluates reportable segment performance and allocates resources based on segment revenues and expenses. Segment expenses include the direct expenses of each segment organization and exclude selling and marketing expenses, general and administrative expenses, stock-based compensation expense, depreciation expense, adjustments to incentive bonus compensation from target amounts, amortization of intangible assets, reorganization costs, other income and gains (losses) on investments. The accounting policies used by the segments are the same as those used in the consolidated financial statements.


	Products		Research			Project Consulting		Consolidated
Three Months Ended March 31, 2015
Research services revenues	$	51,858	$	—		$	—	$	51,858
Advisory services and events revenues		2,467		10,327			10,535		23,329

Total segment revenues		54,325		10,327			10,535		75,187
Segment expenses		8,349		12,948			6,960		28,257

Contribution margin (loss)		45,976		(2,621	)		3,575		46,930
Selling, marketing, administrative and other expenses									(44,000	)
Amortization of intangible assets									(221	)
Reorganization costs									(3,424	)
Other income and gains (losses) on investments									263

Loss before income taxes								$	(452	)


	Products		Research		Project Consulting			Consolidated
Three Months Ended March 31, 2014
Research services revenues	$	50,793	$	—	$	—		$	50,793
Advisory services and events revenues		2,857		13,976		5,445			22,278

Total segment revenues		53,650		13,976		5,445			73,071
Segment expenses		8,351		13,975		5,677			28,003

Contribution margin (loss)		45,299		1		(232	)		45,068
Selling, marketing, administrative and other expenses									(43,660	)
Amortization of intangible assets									(539	)
Reorganization costs									(849	)
Other income and gains (losses) on investments									(27	)

Loss before income taxes								$	(7	)

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
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-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

+ Details

Recent Accounting Pronouncements	3 Months Ended
Recent Accounting Pronouncements	Mar. 31, 2015
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	Note 10 — Recent Accounting Pronouncements In May, 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers, which supersedes all existing revenue recognition requirements, including most industry-specific guidance. The new standard requires a company to recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration that the company expects to receive for those goods or services. The new standard will be effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. For Forrester, the standard will be effective in the first quarter of 2017. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. The Company has not yet selected a transition method. The Company is currently evaluating the potential changes from this ASU to its future financial reporting and disclosures. However, the FASB is contemplating changes to the new standard and its effective date, which could impact the Company’s evaluation.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
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-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

+ Details

Interim Consolidated Financial Statements (Policies)	3 Months Ended
Interim Consolidated Financial Statements (Policies)	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for reporting on Form 10-Q. Accordingly, certain information and footnote disclosures required for complete financial statements are not included herein. The year-end balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. It is recommended that these financial statements be read in conjunction with the consolidated financial statements and related notes that appear in the Forrester Research, Inc. (“Forrester”) Annual Report on Form 10-K for the year ended December 31, 2014. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the financial position, results of operations, comprehensive loss and cash flows as of the dates and for the periods presented have been included. The results of operations for the three months ended March 31, 2015 may not be indicative of the results for the year ending December 31, 2015, or any other period.
Fair Value Measurements	Fair Value Measurements The carrying amounts reflected in the Consolidated Balance Sheets for cash and cash equivalents, accounts receivable, accounts payable, and accrued expenses approximate fair value due to their short-term maturities. See Note 3 – Marketable Investments for the fair value of the Company’s marketable investments.
Revenue Recognition	In May, 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers, which supersedes all existing revenue recognition requirements, including most industry-specific guidance. The new standard requires a company to recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration that the company expects to receive for those goods or services. The new standard will be effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. For Forrester, the standard will be effective in the first quarter of 2017. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. The Company has not yet selected a transition method. The Company is currently evaluating the potential changes from this ASU to its future financial reporting and disclosures. However, the FASB is contemplating changes to the new standard and its effective date, which could impact the Company’s evaluation.

- Definition

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

+ References + Details

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Components of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income (loss) are as follows (in thousands):


	Net Unrealized Gain (Loss) on Marketable Investments			Cumulative Translation Adjustment			Total Accumulated Other Comprehensive Income (Loss)
Balance at January 1, 2015	$	(74	)	$	(1,539	)	$	(1,613	)
Foreign currency translation		—			(3,000	)		(3,000	)
Unrealized loss on investments, net of tax of $62		98			—			98

Balance at March 31, 2015	$	24		$	(4,539	)	$	(4,515	)


	Net Unrealized Gain (Loss) on Marketable Investments		Cumulative Translation Adjustment		Total Accumulated Other Comprehensive Income (Loss)
Balance at January 1, 2014	$	16	$	2,438	$	2,454
Foreign currency translation		—		45		45
Unrealized gain on investments before reclassification, net of tax of $0		6		—		6
Reclassification adjustment for net loss realized in net loss, net of tax of $0		5		—		5

Balance at March 31, 2014	$	27	$	2,483	$	2,510

Marketable Investments (Tables)

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Summary of Company's Marketable Investments

The following table summarizes the Company’s marketable investments (in thousands):


	As of March 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value

Corporate obligations	$	60,792	$	56	$	(16	)	$	60,832


	As of December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value

Corporate obligations	$	55,005	$	13	$	(133	)	$	54,885

Summary of Maturity Periods of Marketable Securities

The following table summarizes the maturity periods of the marketable securities in the Company’s portfolio as of March 31, 2015 (in thousands).


	FY 2015		FY 2016		FY 2017		Thereafter		Total
Corporate obligations	$	12,432	$	24,575	$	22,819	$	1,006	$	60,832

Summary of Gross Unrealized Losses and Market Value of Available-for-Sale Securities with Unrealized Losses


	As of March 31, 2015
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses

Corporate obligations	$	15,235	$	12	$	2,053	$	4


	As of December 31, 2014
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses

Corporate obligations	$	38,175	$	133	$	—	$	—

Summary of Company's Fair Value Hierarchy for its Financial Assets


	As of March 31, 2015
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	845	$	—	$	—	$	845
Corporate obligations		—		60,832		—		60,832

Total	$	845	$	60,832	$	—	$	61,677


	As of December 31, 2014
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	1,794	$	—	$	—	$	1,794
Corporate obligations		—		54,885		—		54,885

Total	$	1,794	$	54,885	$	—	$	56,679

(1)	Included in cash and cash equivalents.

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Reorganization (Tables)

3 Months Ended

Mar. 31, 2015

Restructuring and Related Activities [Abstract]

Summary of Rolls Forward of Activity in Reorganization Accrual

The following table rolls forward the activity in the reorganization accrual for the three months ended March 31, 2015 (in thousands):


	Workforce Reduction
Accrual at December 31, 2014	$	118
Additions		3,424
Cash payments		(1,046	)

Accrual at March 31, 2015	$	2,496

Net Loss Per Common Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Summary of Basic and Diluted Weighted Average Common Shares

Basic and diluted weighted average common shares are as follows (in thousands):


	Three Months Ended March 31,
	2015		2014

Basic weighted average common shares outstanding		18,058		19,613
Weighted average common equivalent shares		—		—

Diluted weighted average common shares outstanding		18,058		19,613

Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive		2,052		2,080

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Summary of Stock Option Activity

Stock option activity for the three months ended March 31, 2015 is presented below (in thousands, except per share data):


	Number of Shares			Weighted - Average Exercise Price Per Share		Weighted - Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding at December 31, 2014		1,954		$	33.81
Granted		44			38.64
Exercised		(20	)		28.58
Forfeited		(55	)		36.46

Outstanding at March 31, 2015		1,923		$	33.90		6.88	$	6,536

Exercisable at March 31, 2015		875		$	30.66		4.90	$	5,452

Vested and expected to vest at March 31, 2015		1,822		$	33.72		6.77	$	6,466

Details of Restricted Stock Unit Activity

Restricted stock unit activity for the three months ended March 31, 2015 is presented below (in thousands, except per share data):


	Number of Shares			Weighted- Average Grant Date Fair Value
Unvested at December 31, 2014		433		$	35.64
Granted		5			36.43
Vested		—			—
Forfeited		(21	)		35.61

Unvested at March 31, 2015		417		$	35.65

Summary of Stock-Based Compensation Recorded in Expense Categories

Stock-based compensation was recorded in the following expense categories (in thousands):


	Three Months Ended March 31,
	2015		2014
Cost of services and fulfillment	$	1,237	$	1,073
Selling and marketing		334		338
General and administrative		615		536

Total	$	2,186	$	1,947

Options Granted Under Equity Incentive Plans and Shares Subject to Employee Stock Purchase Plan Valuation Assumptions

Options granted under the equity incentive plans and shares subject to purchase under the employee stock purchase plan were valued using the following assumptions:


	Three Months Ended March 31, 2015						Three Months Ended March 31, 2014
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		1.37	%		0.11	%		1.65	%		0.08	%
Expected dividend yield		1.8	%		1.8	%		1.8	%		1.8	%
Expected life		5.1 Years			0.5 Years			5.1 Years			0.5 Years
Expected volatility		25	%		22	%		30	%		25	%
Weighted average fair value	$	7.48		$	7.93		$	8.79		$	7.81

Operating Segments (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Summary of Information about Reportable Segments


	Products		Research			Project Consulting		Consolidated
Three Months Ended March 31, 2015
Research services revenues	$	51,858	$	—		$	—	$	51,858
Advisory services and events revenues		2,467		10,327			10,535		23,329

Total segment revenues		54,325		10,327			10,535		75,187
Segment expenses		8,349		12,948			6,960		28,257

Contribution margin (loss)		45,976		(2,621	)		3,575		46,930
Selling, marketing, administrative and other expenses									(44,000	)
Amortization of intangible assets									(221	)
Reorganization costs									(3,424	)
Other income and gains (losses) on investments									263

Loss before income taxes								$	(452	)


	Products		Research		Project Consulting			Consolidated
Three Months Ended March 31, 2014
Research services revenues	$	50,793	$	—	$	—		$	50,793
Advisory services and events revenues		2,857		13,976		5,445			22,278

Total segment revenues		53,650		13,976		5,445			73,071
Segment expenses		8,351		13,975		5,677			28,003

Contribution margin (loss)		45,299		1		(232	)		45,068
Selling, marketing, administrative and other expenses									(43,660	)
Amortization of intangible assets									(539	)
Reorganization costs									(849	)
Other income and gains (losses) on investments									(27	)

Loss before income taxes								$	(7	)

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,613)	$ 2,454
Foreign currency translation	(3,000)	45
Unrealized gain on investments before reclassification, net of tax	98	6
Reclassification adjustment for net loss realized in net loss, net of tax		5
Ending Balance	(4,515)	2,510
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(74)	16
Unrealized gain on investments before reclassification, net of tax	98	6
Reclassification adjustment for net loss realized in net loss, net of tax		5
Ending Balance	24	27
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,539)	2,438
Foreign currency translation	(3,000)	45
Ending Balance	$ (4,539)	$ 2,483

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]
Tax on Unrealized gain (loss) on investments before reclassification	$ 62	$ 0
Tax on reclassification adjustment for net loss realized in net loss		$ 0

Marketable Investments - Summary of Company's Marketable Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Market Value	$ 60,832	$ 54,885
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	60,792	55,005
Gross Unrealized Gains	56	13
Gross Unrealized Losses	(16)	(133)
Market Value	$ 60,832	$ 54,885

Marketable Investments - Summary of Maturity Periods of the Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total	$ 60,832	$ 54,885
Corporate Obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
FY 2015	12,432
FY 2016	24,575
FY 2017	22,819
Thereafter	1,006
Total	$ 60,832	$ 54,885

Marketable Investments - Summary of Gross Unrealized Losses and Market Value of Available-for-Sale Securities with Unrealized Losses (Detail) - Corporate Obligations [Member] - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Less Than 12 Months, Market Value	$ 15,235	$ 38,175
Available for sale securities, Less Than 12 Months, Unrealized Losses	12	$ 133
Available for sale securities, 12 Months or Greater, Market Value	2,053
Available for sale securities, 12 Months or Greater, Unrealized Losses	$ 4

Marketable Investments - Summary of Company's Fair Value Hierarchy for its Financial Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	$ 61,677	$ 56,679
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	845	1,794
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	60,832	54,885
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	845	1,794
Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	845	1,794
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	60,832	54,885
Level 2 [Member] \| Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	$ 60,832	$ 54,885

Non-Marketable Investments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying value of the Company's non-marketable investments	$ 3.7		$ 3.8
Book value of investment	0.6		$ 0.7
Gross distributions received from funds	$ 0.1	$ 1.4
Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Ownership interest of Company	5.00%

Reorganization - Additional Information (Detail) - USD ($)	3 Months Ended				12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Percentage of workforce reduction		4.00%			1.00%
Severance costs		$ 3,400,000	$ 1,000,000	$ 800,000	$ 1,800,000
Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected increase in the workforce		7.00%
Forecast [Member] \| Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 300,000
Forecast [Member] \| Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 500,000

Reorganization - Summary of Rolls Forward of Activity in Reorganization Accrual (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Additions	$ 3,424	$ 849
Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Accrual Beginning Balance	118
Additions	3,424
Cash payments	(1,046)
Accrual Ending Balance	$ 2,496

Net Loss Per Common Share - Summary of Basic and Diluted Weighted Average Common Shares (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	18,058	19,613
Weighted average common equivalent shares	0	0
Diluted weighted average common shares outstanding	18,058	19,613
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive	2,052	2,080

Stockholders' Equity - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2015 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Shares, Outstanding at December 31, 2014 \| shares	1,954
Number of Shares, Granted \| shares	44
Number of Shares, Exercised \| shares	(20)
Number of Shares, Forfeited \| shares	(55)
Number of Shares, Outstanding at March 31, 2015 \| shares	1,923
Number of Shares, Exercisable at March 31, 2015 \| shares	875
Number of Shares, Vested and expected to vest at March 31, 2015 \| shares	1,822
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance \| $ / shares	$ 33.81
Weighted - Average Exercise Price Per Share, Granted \| $ / shares	38.64
Weighted - Average Exercise Price Per Share, Exercised \| $ / shares	28.58
Weighted - Average Exercise Price Per Share, Forfeited \| $ / shares	36.46
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance \| $ / shares	33.90
Weighted - Average Exercise Price Per Share, Exercisable at March 31, 2015 \| $ / shares	30.66
Weighted Average Exercise Price Per Share, Vested and expected to vest at March 31, 2015 \| $ / shares	$ 33.72
Weighted - Average Remaining Contractual Term, Outstanding at March 31, 2015	6 years 10 months 17 days
Weighted - Average Remaining Contractual Term, Exercisable at March 31, 2015	4 years 10 months 24 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at March 31, 2015	6 years 9 months 7 days
Aggregate Intrinsic Value, Outstanding at March 31, 2015 \| $	$ 6,536
Aggregate Intrinsic Value, Exercisable at March 31, 2015 \| $	5,452
Aggregate Intrinsic Value, Vested and expected to vest at March 31, 2015 \| $	$ 6,466

Stockholders' Equity - Details of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) [Member] shares in Thousands	3 Months Ended
	Mar. 31, 2015 $ / shares shares
Schedule Of Summary Of Restricted Stock Unit Activity [Line Items]
Number of Shares, Unvested at December 31, 2014 \| shares	433
Number of Shares, Granted \| shares	5
Number of Shares, Vested \| shares	0
Number of Shares, Forfeited \| shares	(21)
Number of Shares, Unvested at March 31, 2015 \| shares	417
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance \| $ / shares	$ 35.64
Weighted-Average Grant Date Fair Value, Granted \| $ / shares	36.43
Weighted-Average Grant Date Fair Value, Vested or settled \| $ / shares	0
Weighted-Average Grant Date Fair Value, Forfeited \| $ / shares	35.61
Weighted-Average Grant Date Fair Value , Unvested, Ending Balance \| $ / shares	$ 35.65

Stockholders' Equity - Summary of Stock-Based Compensation Recorded in Expense Categories (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total allocated share-based compensation expense	$ 2,186	$ 1,947
Cost of Services and Fulfillment [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total allocated share-based compensation expense	1,237	1,073
Selling and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total allocated share-based compensation expense	334	338
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total allocated share-based compensation expense	$ 615	$ 536

Stockholders' Equity - Options Granted Under Equity Incentive Plans and Shares Subject to Employee Stock Purchase Plan Valuation Assumptions (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	1.37%	1.65%
Expected dividend yield	1.80%	1.80%
Expected life	5 years 1 month 6 days	5 years 1 month 6 days
Expected volatility	25.00%	30.00%
Weighted average fair value	$ 7.48	$ 8.79
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	0.11%	0.08%
Expected dividend yield	1.80%	1.80%
Expected life	6 months	6 months
Expected volatility	22.00%	25.00%
Weighted average fair value	$ 7.93	$ 7.81

Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend paid per share		$ 0.17	$ 0.16
Aggregate dividend declared for the year		$ 3,100,000	$ 3,100,000
Cash dividends declared per common share		$ 0.17	$ 0.16
Authorized to purchase of common stock under the stock repurchase program		$ 435,000,000		$ 25,000,000
Repurchase of common Stock		0.2	0.8
Cumulative aggregate cost of repurchase of common stock		$ 5,700,000	$ 29,700,000
Cumulative repurchase of common stock		14.5
Aggregate cost of repurchase of common stock		$ 407,900,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividends declared per common share	$ 0.17
Dividend payable date	Jun. 24, 2015
Dividend payable record date	Jun. 10, 2015

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (228)	$ 59
Loss before taxes	$ (452)	$ (7)

Operating Segment and Enterprise Wide Reporting - Summary of Information about Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Research services revenues	$ 51,858	$ 50,793
Advisory services and events revenues	23,329	22,278
Total segment revenues	75,187	73,071
Segment expenses	28,257	28,003
Contribution margin (loss)	46,930	45,068
Selling, marketing, administrative and other expenses	(44,000)	(43,660)
Amortization of intangible assets	(221)	(539)
Reorganization costs	(3,424)	(849)
Other income and gains (losses) on investments	263	(27)
Loss before income taxes	(452)	(7)
Products Segment [Member]
Segment Reporting Information [Line Items]
Research services revenues	51,858	50,793
Advisory services and events revenues	2,467	2,857
Total segment revenues	54,325	53,650
Segment expenses	8,349	8,351
Contribution margin (loss)	45,976	45,299
Research Segment [Member]
Segment Reporting Information [Line Items]
Advisory services and events revenues	10,327	13,976
Total segment revenues	10,327	13,976
Segment expenses	12,948	13,975
Contribution margin (loss)	(2,621)	1
Project Consulting [Member]
Segment Reporting Information [Line Items]
Advisory services and events revenues	10,535	5,445
Total segment revenues	10,535	5,445
Segment expenses	6,960	5,677
Contribution margin (loss)	$ 3,575	$ (232)