10-Q

FORM 10-Q

(MARK ONE)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934.

FOR THE QUARTERLY PERIOD ENDED September 30, 2013

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934.

COMMISSION FILE NUMBER: 000-21433

FORRESTER RESEARCH, INC.

(Exact name of registrant as specified in its charter)

DELAWARE	04-2797789
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
60 Acorn Park Drive CAMBRIDGE, MASSACHUSETTS	02140
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (617) 613-6000

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	¨	Accelerated filer	x
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

As of November 7, 2013, 19,753,000 shares of the registrant’s common stock were outstanding.

FORRESTER RESEARCH, INC.

INDEX TO FORM 10-Q

	PAGE
PART I. FINANCIAL INFORMATION		3
ITEM 1. Financial Statements		3
Consolidated Balance Sheets as of September 30, 2013 and December 31, 2012 (Unaudited)		3
Consolidated Statements of Income for the Three and Nine Months Ended September  30, 2013 and 2012 (Unaudited)		4
Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September  30, 2013 and 2012 (Unaudited)		5
Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2013 and 2012 (Unaudited)		6
Notes to Consolidated Financial Statements		7
ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations		17
ITEM 3. Quantitative and Qualitative Disclosures About Market Risk		22
ITEM 4. Controls and Procedures		22
PART II. OTHER INFORMATION		23
ITEM 1A. Risk Factors		23
ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds		23
ITEM 6. Exhibits		23

2

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

FORRESTER RESEARCH, INC.

CONSOLIDATED BALANCE SHEETS

(In thousands, except per share data, unaudited)

	September 30, 2013			December 31, 2012
ASSETS
Current Assets:
Cash and cash equivalents	$	70,700		$	98,810
Marketable investments (Note 2)		86,961			134,876
Accounts receivable, net		37,009			74,623
Deferred commissions		8,408			9,410
Prepaid expenses and other current assets		18,645			18,978
Total current assets		221,723			336,697
Long-term marketable investments (Note 2)		9,092			8,970
Property and equipment, net		41,058			46,300
Goodwill		79,493			78,954
Intangible assets, net		6,296			7,920
Other assets		11,166			8,809
Total assets	$	368,828		$	487,650
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities:
Accounts payable	$	918		$	772
Accrued expenses and other current liabilities		25,184			30,078
Deferred revenue		125,787			150,495
Total current liabilities		151,889			181,345
Non-current liabilities		8,972			9,433
Total liabilities		160,861			190,778
Commitments
Stockholders’ Equity (Note 6):
Preferred stock, $.01 par value Authorized - 500 shares, issued and outstanding - none		—			—
Common stock, $.01 par value Authorized - 125,000 shares Issued - 20,389 and 31,451 as of September 30, 2013 and December 31, 2012, respectively Outstanding - 19,896 and 22,293 as of September 30, 2013 and December 31, 2012, respectively		204			315
Additional paid-in capital		105,396			389,362
Retained earnings		118,814			117,450
Treasury stock - 493 and 9,158 as of September 30, 2013 and December 31, 2012, respectively, at cost		(17,071	)		(210,843	)
Accumulated other comprehensive income		624			588
Total stockholders’ equity		207,967			296,872
Total liabilities and stockholders’ equity	$	368,828		$	487,650

The accompanying notes are an integral part of these consolidated financial statements.

3

FORRESTER RESEARCH, INC.

CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per share data, unaudited)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Revenues:
Research services	$	49,855		$	50,509		$	151,445		$	151,145
Advisory services and other		19,960			18,264			68,684			66,725
Total revenues		69,815			68,773			220,129			217,870
Operating expenses:
Cost of services and fulfillment		27,584			25,736			85,397			82,502
Selling and marketing		25,771			24,309			79,617			75,709
General and administrative		9,310			8,720			27,217			27,124
Depreciation		2,292			2,262			6,954			6,510
Amortization of intangible assets		557			579			1,670			1,779
Reorganization costs		—			37			1,905			1,431
Total operating expenses		65,514			61,643			202,760			195,055
Income from operations		4,301			7,130			17,369			22,815
Other income (expense), net		(71	)		357			560			896
Gains (losses) on investments, net		18			755			(84	)		898
Income before income taxes		4,248			8,242			17,845			24,609
Income tax provision (benefit)		1,813			(2,468	)		7,056			3,191
Net income	$	2,435		$	10,710		$	10,789		$	21,418
Basic income per common share	$	0.12		$	0.48		$	0.51		$	0.95
Diluted income per common share	$	0.12		$	0.47		$	0.50		$	0.93
Basic weighted average common shares outstanding		20,117			22,398			21,226			22,573
Diluted weighted average common shares outstanding		20,665			22,858			21,690			23,018
Cash dividends declared per common share	$	0.15		$	0.14		$	0.45		$	0.42

The accompanying notes are an integral part of these consolidated financial statements.

4

FORRESTER RESEARCH, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In thousands, unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Net income	$	2,435		$	10,710		$	10,789		$	21,418
Other comprehensive income, net of taxes:
Cumulative translation adjustments		1,560			7,197			221			6,865
Changes in market value of investments:
Unrealized gain (loss), net of taxes (benefits) of $143 and $188 for the three months ended September 30, 2013 and 2012, and $(98) and $354 for the nine months ended September 30, 2013 and 2012		238			291			(202	)		624
Less: reclassification adjustment for net (gains) losses realized in net income, net of taxes of $4 and $2 for the three months ended September 30, 2013 and 2012, and $(11) and $12 for the nine months ended September 30, 2013 and 2012		(7	)		(3	)		17			(17	)
Net change in market value of investments		231			288			(185	)		607
Other comprehensive income		1,791			7,485			36			7,472
Comprehensive income	$	4,226		$	18,195		$	10,825		$	28,890

The accompanying notes are an integral part of these consolidated financial statements.

5

FORRESTER RESEARCH, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands, unaudited)

	Nine Months Ended
	September 30,
	2013			2012
Cash flows from operating activities:
Net income	$	10,789		$	21,418
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		6,954			6,510
Amortization of intangible assets		1,670			1,779
Net (gains) losses from investments		84			(898	)
Deferred income taxes		(6,461	)		(9,851	)
Stock-based compensation		4,588			3,921
Amortization of premium on investments		1,809			2,144
Foreign currency losses		248			382
Changes in assets and liabilities, net of acquisitions
Accounts receivable		37,570			37,196
Deferred commissions		1,002			4,127
Prepaid expenses and other current assets		3,683			3,991
Accounts payable		116			(318	)
Accrued expenses and other liabilities		(4,698	)		(4,327	)
Deferred revenue		(25,002	)		(23,308	)
Net cash provided by operating activities		32,352			42,766
Cash flows from investing activities:
Purchases of property and equipment		(2,049	)		(4,388	)
Purchases of marketable investments		(39,636	)		(85,211	)
Proceeds from sales and maturities of marketable investments		85,398			73,055
Change in restricted cash		—			946
Other investing activity		134			66
Net cash provided by (used in) investing activities		43,847			(15,532	)
Cash flows from financing activities:
Dividends paid on common stock		(9,425	)		(9,481	)
Repurchases of common stock		(109,193	)		(26,187	)
Proceeds from issuance of common stock under employee equity incentive plans		14,506			8,538
Excess tax benefits from stock-based compensation		687			401
Payment of deferred acquisition consideration		(900	)		(864	)
Net cash used in financing activities		(104,325	)		(27,593	)
Effect of exchange rate changes on cash and cash equivalents		16			212
Net decrease in cash and cash equivalents		(28,110	)		(147	)
Cash and cash equivalents, beginning of period		98,810			81,047
Cash and cash equivalents, end of period	$	70,700		$	80,900

The accompanying notes are an integral part of these consolidated financial statements.

6

FORRESTER RESEARCH, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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, 2012. 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, and cash flows as of the dates and for the periods presented have been included. The results of operations for the three and nine months ended September 30, 2013 may not be indicative of the results for the year ending December 31, 2013, 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 2 – Marketable Investments for the fair value of the Company’s marketable investments.

Revision of Prior Period Financial Statements

During the quarter ended September 30, 2013, the Company identified certain prior period errors that affected the interim and annual periods in the years ended December 31, 2012 and 2011, as well as the interim periods in the six months ended June 30, 2013. The Company has reflected in the financial information included in this Note the correction of all identified prior period errors in the periods in which they originated. The prior period errors relate to:

• An adjustment of $0.8 million for the three and six months ended June 30, 2013 to increase the amount of research services revenue related to recognition of revenue for the event ticket included in the Company’s RoleView and Forrester Leadership Board subscription products. Based on the identification of this error, the Company reassessed its historical calculations and identified a required change in its methodology for the accounting for an insignificant amount of contract modifications during this period that resulted in an increase (decrease) to revenue for each of the periods is as follows: ($0.1) million and $0.1 million for the three months ended March 31, 2012 and September 30, 2012, respectively, and $0.1 million for the year ended December 31, 2011. This error has been reflected in deferred revenue in the revised consolidated balance sheet and statement of cash flows presented below.

• Adjustments to the Company’s share of operating results in one of the technology-related investment funds in which the Company holds an interest, which adjustments are principally a result of information received by the Company from the fund after the applicable reporting periods. The Company records a portion of the fund’s operating results, based on the Company’s ownership interest in the fund, as investment gains (losses). The adjustments to the gains (losses) on investments for each period is as follows: ($0.1) million and $0.1 million for the three months ended March 31, 2013 and June 30, 2013, respectively; $0.6 million and ($0.1) million for the three months ended September 30, 2012 and December 31, 2012, respectively; and $0.5 million and ($1.4) million for the years ended December 31, 2012 and 2011, respectively. This error has been reflected in other assets in the revised consolidated balance sheet and in net (gains) losses from investments in the revised statement of cash flows presented below.

• Adjustments to revenue for historical insignificant variances in deferred revenue for reconciling items between the Company’s general ledger and sub-ledger system. The increase (decrease) to revenue for each of the periods is as follows: ($0.1) million for the three months ended March 31, 2013; ($0.2) million, $0.2 million and $0.1 million for the three months ended June 30, 2012, September 30, 2012 and December 31, 2012, respectively; and $0.1 million and ($0.4) million for the years ended December 31, 2012 and 2011, respectively. This error has been reflected in deferred revenue in the revised consolidated balance sheet and statement of cash flows presented below.

• Adjustments within the year ended December 31, 2012 for the improper capitalization of software development costs during the three months ended June 30, 2012 and September 30, 2012. These errors were corrected in the three months ended December 31, 2012 in the previously filed financial statements. The increase (decrease) in general and administrative expense for each of the periods is as follows: $0.2 million, $0.3 million and ($0.5) million for the three months ended June 30, 2012, September 30, 2012 and December 31, 2012, respectively. This error has been reflected in purchases of property and equipment in the revised consolidated statement of cash flows presented below.

In evaluating whether the Company’s previously issued consolidated financial statements were materially misstated, the Company considered the guidance in ASC Topic 250, Accounting Changes and Error Corrections, ASC Topic 250-10-S99-1, Assessing Materiality, and ASC Topic 250-10-S99-2, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements. The Company concluded that these errors were not material individually or in the aggregate to any of the prior reporting periods, and therefore, amendments of previously filed reports are not required. As such, the revisions for prior period corrections are reflected in the financial information for the applicable prior periods and will be reflected in future filings containing such prior period financial information.

The effects of these prior period errors on the consolidated financial statements are as follows (in thousands, except per share amounts):

Revised Consolidated Statements of Income

	Three Months Ended March 31, 2013									Three Months Ended June 30, 2013								Six Months Ended June 30, 2013
	As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Revenues:
Research services	$	50,378		$	(100	)	$	50,278		$	50,512		$	800		$	51,312	$	100,890		$	700		$	101,590
Advisory services and other		21,121			(38	)		21,083			27,652			(11	)		27,641		48,773			(49	)		48,724
Total revenues		71,499			(138	)		71,361			78,164			789			78,953		149,663			651			150,314
Income from operations		3,418			(138	)		3,280			8,999			789			9,788		12,417			651			13,068
Gains (losses) on investments, net		(51	)		(149	)		(200	)		(51	)		149			98		(102	)		—			(102	)
Income before income taxes		3,743			(287	)		3,456			9,203			938			10,141		12,946			651			13,597
Income tax provision		1,402			(115	)		1,287			3,581			375			3,956		4,983			260			5,243
Net income	$	2,341		$	(172	)	$	2,169		$	5,622		$	563		$	6,185	$	7,963		$	391		$	8,354
Basic income per common share	$	0.10		$	—		$	0.10		$	0.26		$	0.03		$	0.29	$	0.37		$	0.01		$	0.38
Diluted income per common share	$	0.10		$	—		$	0.10		$	0.26		$	0.02		$	0.28	$	0.36		$	0.02		$	0.38

7

	Nine Months Ended September 30, 2012							Three Months Ended December 31, 2012									Full Year Ended December 31, 2012
	As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments		As Revised
Revenues:
Research services	$	151,132	$	13		$	151,145	$	51,866		$	80		$	51,946		$	202,998		$	93	$	203,091
Advisory services and other		66,732		(7	)		66,725		23,200			15			23,215			89,932			8		89,940
Total revenues		217,864		6			217,870		75,066			95			75,161			292,930			101		293,031
Operating expenses:
General and administrative		26,667		457			27,124		10,199			(457	)		9,742			36,866			—		36,866
Total operating expenses		194,598		457			195,055		67,673			(457	)		67,216			262,271			—		262,271
Income from operations		23,266		(451	)		22,815		7,393			552			7,945			30,659			101		30,760
Gains (losses) on investments, net		290		608			898		(739	)		(65	)		(804	)		(449	)		543		94
Income before income taxes		24,452		157			24,609		7,058			487			7,545			31,510			644		32,154
Income tax provision		3,129		62			3,191		2,807			195			3,002			5,936			257		6,193
Net income	$	21,323	$	95		$	21,418	$	4,251		$	292		$	4,543		$	25,574		$	387	$	25,961
Basic income per common share	$	0.94	$	0.01		$	0.95	$	0.19		$	0.01		$	0.20		$	1.14		$	0.01	$	1.15
Diluted income per common share	$	0.93	$	—		$	0.93	$	0.19		$	0.01		$	0.20		$	1.12		$	0.01	$	1.13

	Three Months Ended June 30, 2012							Six Months Ended June 30, 2012							Three Months Ended September 30, 2012
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Revenues:
Research services	$	51,072	$	(100	)	$	50,972	$	100,832	$	(196	)	$	100,636	$	50,300		$	209		$	50,509
Advisory services and other		28,021		(61	)		27,960		48,521		(60	)		48,461		18,211			53			18,264
Total revenues		79,093		(161	)		78,932		149,353		(256	)		149,097		68,511			262			68,773
Operating expenses:
General and administrative		8,645		148			8,793		18,256		148			18,404		8,411			309			8,720
Total operating expenses		67,632		148			67,780		133,264		148			133,412		61,334			309			61,643
Income from operations		11,461		(309	)		11,152		16,089		(404	)		15,685		7,177			(47	)		7,130
Gains (losses) on investments, net		84		—			84		143		—			143		147			608			755
Income before income taxes		11,675		(309	)		11,366		16,771		(404	)		16,367		7,681			561			8,242
Income tax provision		3,906		(124	)		3,782		5,821		(162	)		5,659		(2,692	)		224			(2,468	)
Net income	$	7,769	$	(185	)	$	7,584	$	10,950	$	(242	)	$	10,708	$	10,373		$	337		$	10,710
Basic income per common share	$	0.34	$	—		$	0.34	$	0.48	$	(0.01	)	$	0.47	$	0.46		$	0.02		$	0.48
Diluted income per common share	$	0.34	$	(0.01	)	$	0.33	$	0.47	$	(0.01	)	$	0.46	$	0.45		$	0.02		$	0.47

	Three Months Ended March 31, 2012							Full Year Ended December 31, 2011
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised
Revenues:
Research services	$	49,760	$	(96	)	$	49,664	$	191,648	$	(153	)	$	191,495
Advisory services and other		20,500		1			20,501		91,968		(128	)		91,840
Total revenues		70,260		(95	)		70,165		283,616		(281	)		283,335
Income from operations		4,628		(95	)		4,533		36,997		(281	)		36,716
Gains (losses) on investments, net		59		—			59		1,018		(1,417	)		(399	)
Income before income taxes		5,096		(95	)		5,001		38,645		(1,698	)		36,947
Income tax provision		1,915		(38	)		1,877		15,635		(679	)		14,956
Net income	$	3,181	$	(57	)	$	3,124	$	23,010	$	(1,019	)	$	21,991
Basic income per common share	$	0.14	$	—		$	0.14	$	1.02	$	(0.05	)	$	0.97
Diluted income per common share	$	0.14	$	(0.01	)	$	0.13	$	0.99	$	(0.04	)	$	0.95

8

Revised Consolidated Statements of Comprehensive Income

The consolidated statements of comprehensive income for all periods is impacted by the same amount as net income for the respective period.

9

Revised Consolidated Balance Sheet

	As of December 31, 2012
	As Previously Reported		Adjustments			As Revised
Current Assets:
Prepaid expenses and other current assets	$	18,846	$	132		$	18,978
Total current assets		336,565		132			336,697
Other assets		9,123		(314	)		8,809
Total assets	$	487,832	$	(182	)	$	487,650
Current Liabilities:
Deferred revenue	$	150,479	$	16		$	150,495
Total current liabilities		181,329		16			181,345
Total liabilities		190,762		16			190,778
Retained earnings		117,648		(198	)		117,450
Total stockholders’ equity		297,070		(198	)		296,872
Total liabilities and stockholders’ equity	$	487,832	$	(182	)	$	487,650

Revised Consolidated Statements of Cash Flows

	Three Months Ended March 31, 2013							Six Months Ended June 30, 2013
	As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Cash flows from operating activities:
Net income	$	2,341	$	(172	)	$	2,169	$	7,963		$	391		$	8,354
Net (gains) losses from investments		51		149			200		102			—			102
Prepaid expenses and other current assets		1,271		(115	)		1,156		4,619			260			4,879
Deferred revenue		2,709		138			2,847		(12,955	)		(651	)		(13,606	)
Net cash provided by operating activities		35,453		—			35,453		37,231			—			37,231

	Nine Months Ended September 30, 2012									Year Ended December 31, 2012									Year Ended December 31, 2011
	As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised
Cash flows from operating activities:
Net income	$	21,323		$	95		$	21,418		$	25,574		$	387		$	25,961		$	23,010		$	(1,019	)	$	21,991
Net (gains) losses from investments		(290	)		(608	)		(898	)		449			(543	)		(94	)		(1,018	)		1,417			399
Prepaid expenses and other current assets		3,929			62			3,991			6,279			257			6,536			(7,805	)		(679	)		(8,484	)
Deferred revenue		(23,302	)		(6	)		(23,308	)		1,807			(101	)		1,706			16,364			281			16,645
Net cash provided by operating activities		43,223			(457	)		42,766			53,147			—			53,147			55,444			—			55,444
Purchases of property and equipment		(4,845	)		457			(4,388	)		(5,103	)		—			(5,103	)		(39,776	)		—			(39,776	)
Net cash provided by (used in) investing activities		(15,989	)		457			(15,532	)		(4,076	)		—			(4,076	)		(53,036	)		—			(53,036	)

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Note 2 — Marketable Investments

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value
September 30, 2013
Available-for-sale securities
State and municipal obligations	$	9,660	$	5	$	—		$	9,665
Federal agency and corporate obligations		77,330		131		(165	)		77,296
Total short-term available-for-sale securities		86,990		136		(165	)		86,961
ARS, long-term		11,000		—		(1,908	)		9,092
Total available-for-sale securities	$	97,990	$	136	$	(2,073	)	$	96,053

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value
December 31, 2012
Available-for-sale securities
State and municipal obligations	$	18,859	$	27	$	(14	)	$	18,872
Federal agency and corporate obligations		115,653		380		(29	)		116,004
Total short-term available-for-sale securities		134,512		407		(43	)		134,876
ARS, long-term		11,000		—		(2,030	)		8,970
Total available-for-sale securities	$	145,512	$	407	$	(2,073	)	$	143,846

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 federal agency, state, municipal and corporate obligations were not material in the three and nine months ended September 30, 2013 or 2012.

The following table summarizes the maturity periods of the marketable securities in the Company’s portfolio as of September 30, 2013. In February 2008, certain auction rate securities (“ARS”) that Forrester held experienced failed auctions that limited the liquidity of these securities. These auction failures have continued through September 30, 2013. On October 30, 2013 the Company sold the entire portfolio of ARS for net proceeds of $9.1 million. The following table reflects the ARS at their contractual maturity dates of between 2024 and 2034 (in thousands).

	FY 2013		FY2014		FY2015		Thereafter		Total
State and municipal obligations	$	2,772	$	4,821	$	2,072	$	—	$	9,665
Federal agency and corporate obligations		7,385		25,035		28,919		15,957		77,296
ARS		—		—		—		9,092		9,092
Total	$	10,157	$	29,856	$	30,991	$	25,049	$	96,053

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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 September 30, 2013
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses
State and municipal bonds	$	—	$	—	$	—	$	—
Federal agency and corporate obligations		35,843		165		—		—
ARS		—		—		9,092		1,908
Total	$	35,843	$	165	$	9,092	$	1,908
	As of December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses
State and municipal bonds	$	9,430	$	14	$	—	$	—
Federal agency and corporate obligations		17,716		29		—		—
ARS		—		—		8,970		2,030
Total	$	27,146	$	43	$	8,970	$	2,030

Fair Value

The Company measures certain financial assets at fair value on a recurring basis, including cash equivalents, available-for-sale securities and trading 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 September 30, 2013 and December 31, 2012 (in thousands):

	As of September 30, 2013
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	7,111	$	—	$	—	$	7,111
State and municipal obligations		—		9,665		—		9,665
Federal agency and corporate obligations		—		77,296		—		77,296
ARS		—		—		9,092		9,092
Total	$	7,111	$	86,961	$	9,092	$	103,164
	As of December 31, 2012
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	815	$	—	$	—	$	815
State and municipal obligations		—		18,872		—		18,872
Federal agency and corporate obligations (2)		—		148,117		—		148,117
ARS		—		—		8,970		8,970
Total	$	815	$	166,989	$	8,970	$	176,774

(1) Included in cash and cash equivalents.

(2) $32.1 million are included in cash and cash equivalents at December 31, 2012 as original maturities at the time of purchase were 90 days or less.

Level 2 assets consist of the Company’s entire portfolio of federal, state, municipal and corporate bonds, excluding those municipal bonds described below with an auction reset feature. 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.

Level 3 assets at September 30, 2013 and December 31, 2012 consist entirely of municipal bonds with an auction reset feature (ARS). Prior to 2008, the fair value of the ARS investments approximated par value due to the frequent resets through the auction process. While the Company continues to receive interest income on its ARS investments at each interest reset date (which occurs at either seven or 35 day intervals for each security), these investments trade infrequently and therefore do not

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have a readily determinable market value. Interest rates on the securities ranged from 0.1% to 0.4% and 0.1% to 0.5% during the nine months ended September 30, 2013 and 2012, respectively. The Company values the ARS using a discounted cash flow model that includes unobservable inputs including estimates of future interest rates, discount rates and expected holding periods of the securities, which is considered a Level 3 valuation. Unobservable inputs included in the valuation as of September 30, 2013 include a weighted average interest rate of 1.7%, a weighted average discount rate of 4.9%, and a weighted average holding period of 8.7 years. The valuation resulted in an unrealized loss recorded in accumulated other comprehensive income in the Consolidated Balance Sheets of $1.9 million at September 30, 2013 and $2.0 million at December 31, 2012. As of September 30, 2013, the Company classified the loss as temporary due to the strong underlying credit rating of the securities and the fact that the Company, as of September 30, 2013, did not intend to sell the securities and was not likely to be required to sell the securities. The assumptions used in valuing the ARS are volatile and subject to change as the underlying sources of these assumptions and market conditions change. Significant increases or decreases in any of the valuation assumptions in isolation would result in a significant change in the fair value.

On October 22, 2013 the Company made the decision to sell its entire portfolio of ARS. On October 30, 2013 the Company completed the sale of the ARS for net proceeds of $9.1 million, resulting in a realized loss of $1.9 million that will be recognized as an investment loss in the consolidated statement of income for the three months ended December 31, 2013.

The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets for the nine months ended September 30, 2013 and 2012 (in thousands):

	ARS
Balance at December 31, 2011	$	9,565
Sales		—
Gains included in other comprehensive income		224
Balance at September 30, 2012	$	9,789
	ARS
Balance at December 31, 2012	$	8,970
Sales		—
Gains included in other comprehensive income		122
Balance at September 30, 2013	$	9,092

Note 3 — Non-Marketable Investments

At September 30, 2013 and December 31, 2012, the carrying value of the Company’s non-marketable investments, which were composed primarily of interests in technology-related private equity funds, was $6.2 million and $6.6 million, respectively, and is included in other assets in the Consolidated Balance Sheets.

One of the Company’s investments, with a book value of $0.9 million and $1.2 million at September 30, 2013 and December 31, 2012, 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. The Company recorded a gain (loss) from its non-marketable investments of $(0.1) million during the nine months ended September 30, 2013, and $0.8 million and $0.9 million during the three and nine months ended September 30, 2012, respectively, which is included in gains (losses) on investments, net in the Consolidated Statements of Income. Gains on investments were insignificant during the three months ended September 30, 2013.

In May 2013, the Company extended the expiration date of a cash bonus plan, originally adopted in 2000, that would pay a bonus, after the return of invested capital from certain of the Company’s investments, to certain key employees. To date, no bonuses have been paid under the plan. The plan will now automatically expire on June 30, 2015, subject to earlier expiration as provided in the plan in the event that prior to such date there are less than 10 participants in the plan or all of the Company’s invested capital (as defined in the plan) has been returned to the Company.

Note 4 — Reorganization

The following table rolls forward the activity in the reorganization accrual for the nine months ended September 30, 2013 (in thousands):

	Workforce
	Reduction
Accrual at December 31, 2012	$	14
Additions		1,905
Cash payments		(1,655	)
Accrual at September 30, 2013	$	264

During the nine months ended September 30, 2013 the Company incurred $1.9 million of severance and related costs for the elimination of 31 jobs or approximately 2.5% of its workforce worldwide to streamline its operations. The accrual at September 30, 2013 is expected to be paid by the end of 2013.

Note 5 — Net Income Per Common Share

Basic net income per common share is computed by dividing net income by the basic weighted average number of common shares outstanding during the period. Diluted net income per common share is computed by dividing net income 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.

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Basic weighted average common shares outstanding		20,117		22,398		21,226		22,573
Weighted average common equivalent shares		548		460		464		445
Diluted weighted average common shares outstanding		20,665		22,858		21,690		23,018
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive		608		967		700		644

Note 6 — Stockholders’ Equity

Equity Plans

Stock option activity for the nine months ended September 30, 2013 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, 2012		1,936		$	29.03
Granted		489			35.20
Exercised		(524	)		25.46
Forfeited		(69	)		32.05
Outstanding at September 30, 2013		1,832		$	31.58		7.11	$	9,592
Exercisable at September 30, 2013		866		$	28.73		5.14	$	6,995

Restricted stock unit activity for the nine months ended September 30, 2013 is presented below (in thousands, except per share data):

	Number of Shares			Weighted- Average Grant Date Fair Value
Unvested at December 31, 2012		301		$	32.98
Granted		207			34.58
Vested or settled		(67	)		32.91
Forfeited		(56	)		31.02
Unvested at September 30, 2013		385		$	34.14

Stock-Based Compensation

Forrester recognizes the fair value of stock-based compensation in net income 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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of services and fulfillment	$	1,061	$	835	$	2,708	$	2,213
Selling and marketing		321		207		893		638
General and administrative		478		367		987		1,070
Total	$	1,860	$	1,409	$	4,588	$	3,921

In 2010, the Company issued to its employees approximately 63,000 performance-based RSUs. The vesting of the RSUs was subject to performance criteria and would vest at 100% or 40% on April 1, 2013, or the RSUs could be forfeited, depending on whether specified revenue growth and certain operating margin targets related to full year 2012 performance were achieved. Based on 2012 financial performance these RSUs were forfeited. Compensation expense through the third quarter of 2011 was recognized based on an estimate of 100% vesting of the RSUs and in the fourth quarter of 2011 the Company modified its assessment of vesting to a zero percent level. The Company continued to utilize a zero percent vesting estimate through March 31, 2013.

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In 2011, the Company issued to its employees approximately 71,000 performance-based RSUs. The vesting of the RSUs is subject to performance criteria and will vest at 100% or 40% on April 1, 2014, or the RSUs could be forfeited, depending on whether specified revenue growth and certain operating margin targets related to full year 2013 performance are achieved. Compensation expense through the third quarter of 2011 was recognized based on an estimate of 100% vesting of the RSUs and in the fourth quarter of 2011 the Company modified its assessment of vesting to a zero percent level. The Company continued to utilize a zero percent vesting estimate through the nine months ended September 30, 2013.

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 September 30, 2013						Three Months Ended September 30, 2012
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		1.40	%		0.08	%		0.62	%		0.14	%
Expected dividend yield		2.1	%		2.1	%		1.7	%		1.7	%
Expected life		4.9 Years			0.5 Years			4.5 Years			0.5 Years
Expected volatility		36	%		19	%		40	%		31	%
Weighted average fair value	$	9.94		$	6.02		$	9.42		$	6.89
	Nine Months Ended September 30, 2013						Nine Months Ended September 30, 2012
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		0.81	%		0.08	%		0.87	%		0.14	%
Expected dividend yield		2.1	%		2.1	%		1.7	%		1.7	%
Expected life		4.9 Years			0.5 Years			4.5 Years			0.5 Years
Expected volatility		37	%		19	%		40	%		31	%
Weighted average fair value	$	9.15		$	6.02		$	9.81		$	6.87

Dividends

In the nine months ended September 30, 2013, the Company declared and paid dividends of $9.4 million consisting of a $0.15 per share dividend in each of the first three quarters of 2013. In the nine months ended September 30, 2012, the Company declared and paid dividends of $9.5 million consisting of a $0.14 per share dividend in each of the first three quarters of 2012. In October 2013, the Company declared a dividend of $0.15 per share payable on December 18, 2013 to shareholders of record as of December 4, 2013.

Treasury Stock

Forrester’s Board of Directors has authorized an aggregate $385.0 million, including $25 million authorized in July 2013 and $50 million authorized in February 2013, to purchase common stock under the stock repurchase program. The shares repurchased may be used, among other things, in connection with Forrester’s employee and director equity incentive and purchase plans. In the nine months ended September 30, 2013, the Company repurchased approximately 3.0 million shares of common stock at an aggregate cost of approximately $109.2 million, inclusive of the repurchase of shares pursuant to the “modified Dutch auction” described below. From the inception of the program through September 30, 2013, Forrester repurchased approximately 12.2 million shares of common stock at an aggregate cost of approximately $320.0 million.

On April 3, 2013 the Company commenced a “modified Dutch auction” self-tender offer to repurchase up to $130 million of its common stock at a price per share within the range of $32.00 to $36.00. A “modified Dutch auction” self-tender offer allows stockholders to indicate how many shares and at what price within the company’s specified range (in increments of $0.25 per share) they wish to tender. When the tender offer expired, based upon the number of shares tendered and the prices specified by the tendering stockholders, the Company determined the purchase price, which was the lowest price per share within the range that enabled the Company to purchase up to $130 million of its common stock. The tender offer expired on May 1, 2013 and the Company purchased 2,054,732 shares of its common stock on May 7, 2013 at a purchase price of $36.00 per share for an aggregate purchase price of $74.0 million, plus approximately $1.1 million of expenses related to the tender offer.

In the nine months ended September 30, 2013, the Company retired 11.7 million shares of treasury stock. These retired shares are now included in the Company’s pool of authorized but unissued shares. The retired stock had a carrying value of approximately $303.0 million. The Company’s accounting policy upon the formal retirement of treasury stock is to deduct the par value of the retired stock from Common Stock and to reflect the excess of cost over par value as a deduction from Additional Paid-in Capital.

Note 7 — 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 for the nine months ended September 30, 2013 was $7.1 million resulting in an effective tax rate of 39.5% for the period. Income tax expense for the nine months ended September 30, 2012 was $3.2 million resulting in an effective tax rate of 13.0% for the period. The increase in the effective tax rate during the nine months ended September 30, 2013 as compared to the prior year is primarily due to the 2012 period including a $5.5 million deferred tax benefit resulting from the settlement of a tax audit at one of the Company’s foreign subsidiaries. In addition, the 2012 period included a reduction in the reserve for uncertain tax positions as well as a credit due to a remeasurement gain of a euro-denominated deferred tax liability.

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Note 8 — Operating Segments

Forrester is organized into two client groups with each client group responsible for writing relevant research for the roles within the client organization on a worldwide basis. The two client groups, which are considered operating segments, are: Business Technology (“BT”) and Marketing and Strategy (“M&S”). In addition, the Company’s Events segment supports both client groups. Each client group generates revenues through sales of research, advisory and other service offerings targeted at specific roles within their targeted clients. Each client group consists of research personnel focused primarily on issues relevant to particular roles and to the day-to-day responsibilities of persons within the roles. Amounts included in the Events segment relate to the operations of the events production department. Revenue reported in the Events segment consists primarily of sponsorships and event tickets to Forrester events.

Forrester evaluates reportable segment performance and allocates resources based on direct margin. Direct margin, as presented below, is defined as operating income excluding sales expenses, certain marketing and fulfillment expenses, stock-based compensation expense, general and administrative expenses, depreciation expense, amortization of intangible assets and reorganization costs. In the first quarter of 2013, the Company modified segment direct margin for each of the BT and M&S client groups to reflect the transfer of revenue and direct costs related to one product line from BT to M&S and to reallocate certain shared consulting costs between BT & M&S. Accordingly, the 2012 amounts have been reclassified to conform to the current presentation. The accounting policies used by the segments are the same as those used in the consolidated financial statements.

The following tables present information about reportable segments (in thousands):

	BT		M&S		Events			Consolidated
Three Months Ended September 30, 2013
Revenue	$	37,659	$	31,809	$	347		$	69,815
Direct margin		24,912		20,923		(656	)		45,179
Selling, marketing, administrative and other expenses									(40,321	)
Amortization of intangible assets									(557	)
Reorganization costs									—
Other income (expense) and gains (losses) on investments									(53	)
Income before income taxes								$	4,248
	BT		M&S		Events			Consolidated
Three Months Ended September 30, 2012
Revenue	$	37,764	$	30,707	$	302		$	68,773
Direct margin		25,966		20,203		(727	)		45,442
Selling, marketing, administrative and other expenses									(37,696	)
Amortization of intangible assets									(579	)
Reorganization costs									(37	)
Other income (expense) and gains (losses) on investments									1,112
Income before income taxes								$	8,242
	BT		M&S		Events			Consolidated
Nine Months Ended September 30, 2013
Revenue	$	115,327	$	95,690	$	9,112		$	220,129
Direct margin		78,100		62,909		3,204			144,213
Selling, marketing, administrative and other expenses									(123,269	)
Amortization of intangible assets									(1,670	)
Reorganization costs									(1,905	)
Other income (expense) and gains (losses) on investments									476
Income before income taxes								$	17,845
	BT		M&S		Events			Consolidated
Nine Months Ended September 30, 2012
Revenue	$	115,470	$	92,995	$	9,405		$	217,870
Direct margin		78,882		60,823		3,241			142,946
Selling, marketing, administrative and other expenses									(116,921	)
Amortization of intangible assets									(1,779	)
Reorganization costs									(1,431	)
Other income (expense) and gains (losses) on investments									1,794
Income before income taxes								$	24,609

Note 9 — Recent Accounting Pronouncements

In July 2012, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2012-02, Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment. This accounting standard allows an entity the option to first assess qualitative factors to determine whether it is necessary to perform a quantitative impairment test for indefinite-lived intangibles other than goodwill. Under that option, an entity would no longer be required to calculate the fair value of an indefinite-lived intangible asset unless the entity determines, based on that qualitative assessment, that it is more likely than not that the fair value of the indefinite-lived intangible asset is less than its carrying amount. This ASU was effective for annual and interim indefinite-lived intangible asset impairment tests performed for fiscal years beginning after September 15, 2012. As the Company does not have any indefinite-lived intangible assets as of September 30, 2013 other than goodwill, the adoption of this standard on January 1, 2013 did not have an impact on the Company’s consolidated financial results.

In February 2013, the FASB issued ASU No. 2013-02, Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income. This accounting standard requires companies to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, companies are required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. This ASU is effective for reporting periods beginning after December 15, 2012. Other than requiring additional disclosures, adoption of this ASU did not have a significant impact on the Company’s consolidated financial results.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Words such as “expects,” “believes,” “anticipates,” “intends,” “plans,” “estimates,” or similar expressions are intended to identify these forward-looking statements. These statements include, but are not limited to, statements about the adequacy of our liquidity and capital resources, future growth rates, anticipated increases in our sales force, future dividends, anticipated continued repurchases of our common stock, and remediation of our internal control over financial reporting. These statements are based on our current plans and expectations and involve risks and uncertainties that could cause actual future activities and results of operations to be materially different from those set forth in the forward-looking statements. Important factors that could cause actual future activities and results to differ include, among others, our ability to retain and enrich memberships for our research products and services, technology spending, the risks and challenges inherent in international business activities, our ability to offer new products and services, our dependence on key personnel, the ability to attract and retain professional staff, our ability to respond to business and economic conditions and market trends, the possibility of network disruptions and security breaches, competition and industry consolidation, possible variations in our quarterly operating results, and our ability to remediate the identified material weaknesses in our internal control over financial reporting as of December 31, 2012 and September 30, 2013. These risks are described more completely in our Annual Report on Form 10-K for the year ended December 31, 2012. We undertake no obligation to update publicly any forward-looking statements, whether as a result of new information, future events, or otherwise.

We derive revenues from memberships to our research products and services, performing advisory services and consulting projects, and hosting events. We offer contracts for our research products that are typically renewable annually and payable in advance. Research revenues are recognized as revenue ratably over the term of the contract. Accordingly, a substantial portion of our billings are initially recorded as deferred revenue. Clients purchase advisory services independently and/or to supplement their memberships to our research. Billings attributable to advisory services and consulting projects are initially recorded as deferred revenue. Advisory service revenues, such as workshops, speeches and advisory days, are recognized when the customer receives the agreed upon deliverable. Consulting project revenues, which generally are short-term in nature and based upon fixed-fee agreements, are recognized as the services are provided. Event billings are also initially recorded as deferred revenue and are recognized as revenue upon completion of each event.

Our primary operating expenses consist of cost of services and fulfillment, selling and marketing expenses and general and administrative expenses. Cost of services and fulfillment represents the costs associated with the production and delivery of our products and services, including salaries, bonuses, employee benefits and stock-based compensation expense for research and consulting personnel and all associated editorial, travel, and support services. Selling and marketing expenses include salaries, sales commissions, bonuses, employee benefits, stock-based compensation expense, travel expenses, promotional costs and other costs incurred in marketing and selling our products and services. General and administrative expenses include the costs of the technology, operations, finance, and human resources groups and our other administrative functions, including salaries, bonuses, employee benefits, and stock-based compensation expense. Overhead costs such as facilities are allocated to these categories according to the number of employees in each group.

Deferred revenue, agreement value, client retention, dollar retention, enrichment and number of clients are metrics we believe are important to understanding our business. We believe that the amount of deferred revenue, along with the agreement value of contracts to purchase research and advisory services, provide a significant measure of our business activity. We define these metrics as follows:

• Deferred revenue — billings in advance of revenue recognition as of the measurement date.

• Agreement value — the total revenues recognizable from all research and advisory service contracts in force at a given time (but not including advisory-only contracts), without regard to how much revenue has already been recognized.

• Client retention — the percentage of client companies with memberships expiring during the most recent twelve-month period that renewed one or more of those memberships during that same period.

• Dollar retention — the percentage of the dollar value of all client membership contracts renewed during the most recent twelve-month period to the total dollar value of all client membership contracts that expired during the period.

• Enrichment — the percentage of the dollar value of client membership contracts renewed during the most recent twelve-month period to the dollar value of the corresponding expiring contracts.

• Clients — we count as a single client the various divisions and subsidiaries of a corporate parent and we also aggregate separate instrumentalities of the federal, state, and provincial governments as a single client.

Client retention, dollar retention, and enrichment are not necessarily indicative of the rate of future retention of our revenue base. A summary of our key metrics is as follows (dollars in millions):

	As of September 30,						Absolute Increase (Decrease)			Percentage Increase (Decrease)
	2013			2012
Deferred revenue	$	125.8		$	124.9		$	0.9			1	%
Agreement value	$	210.7		$	221.6		$	(10.9	)		(5	%)
Client retention		76	%		78	%		(2	)		(3	%)
Dollar retention		89	%		91	%		(2	)		(2	%)
Enrichment		95	%		96	%		(1	)		(1	%)
Number of clients		2,482			2,498			(16	)		(1	%)

Deferred revenue at September 30, 2013 increased approximately 1% compared to the prior year; however when including the amount of future invoicing for contracts at both September 30, 2013 and 2012, the combined amount of deferred revenue and future invoicing declined approximately 5% at September 30, 2013 compared to the prior year. This decline is consistent with the decline in agreement value, which continues a trend from 2012 of declining year-over-year growth in these metrics due to the downward trend in the growth in overall contract bookings during this period. Enrichment at 95% for the period ending September 30, 2013 is consistent with the period ending June 30, 2013; however it represents a 1% decrease from the prior year. As the enrichment rate includes a 12-month period, the decline in the rate as of September 30, 2013 compared to the prior year reflects the challenges associated with the implementation of the sales reorganization in January 2012 as well as high sales employee attrition during 2012. Client retention, dollar retention and number of clients at September 30, 2013 all decreased from the prior year; however they remained essentially flat with June 30, 2013 and the retention metrics remain near historical levels.

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Critical Accounting Policies and Estimates

Management’s discussion and analysis of financial condition and results of operations (MD&A) are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our policies and estimates, including but not limited to, those related to our revenue recognition, stock-based compensation, non-marketable investments, goodwill and other intangible assets, income taxes, and valuation and impairment of marketable investments. Management bases its estimates on historical experience, data available at the time the estimates are made and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Our other critical accounting policies and estimates are described in our Annual Report on Form 10-K for the year ended December 31, 2012.

Results of Operations

The prior period results presented within the MD&A have been revised to reflect the error corrections disclosed in Note 1 of the interim consolidated financial statements.

The following table sets forth our statement of income as a percentage of total revenues for the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Revenues:
Research services		71.4	%		73.4	%		68.8	%		69.4	%
Advisory services and other		28.6			26.6			31.2			30.6
Total revenues		100.0			100.0			100.0			100.0
Operating expenses:
Cost of services and fulfillment		39.5			37.4			38.8			37.9
Selling and marketing		36.9			35.3			36.1			34.7
General and administrative		13.3			12.7			12.4			12.4
Depreciation		3.3			3.3			3.1			3.0
Amortization of intangible assets		0.8			0.8			0.8			0.8
Reorganization costs		—			0.1			0.9			0.7
Income from operations		6.2			10.4			7.9			10.5
Other income (expense), net		(0.1	)		0.5			0.2			0.4
Gains (losses) on investments, net		—			1.1			—			0.4
Income before income taxes		6.1			12.0			8.1			11.3
Income tax provision (benefit)		2.6			(3.6	)		3.2			1.5
Net income		3.5	%		15.6	%		4.9	%		9.8	%

Three and Nine Months Ended September 30, 2013 and September 30, 2012

Revenues

	Three Months Ended September 30,						Absolute Increase (Decrease)			Percentage Increase (Decrease)
	2013			2012
	(dollars in millions)
Revenues	$	69.8		$	68.8		$	1.0			2	%
Revenues from research services	$	49.9		$	50.5		$	(0.6	)		(1	%)
Revenues from advisory services and other	$	20.0		$	18.3		$	1.7			9	%
Revenues attributable to customers outside of the U.S.	$	18.9		$	19.5		$	(0.6	)		(3	%)
Percentage of revenue attributable to customers outside of the U.S.		27	%		28	%		(1	)		(4	%)
Number of clients (at end of period)		2,482			2,498			(16	)		(1	%)
Number of events		3			3			—			—
	Nine Months Ended September 30,						Absolute Increase (Decrease)			Percentage Increase (Decrease)
	2013			2012
	(dollars in millions)
Revenues	$	220.1		$	217.9		$	2.2			1	%
Revenues from research services	$	151.4		$	151.1		$	0.3			—
Revenues from advisory services and other	$	68.7		$	66.7		$	2.0			3	%
Revenues attributable to customers outside of the U.S.	$	57.8		$	61.0		$	(3.2	)		(5	%)
Percentage of revenue attributable to customers outside of the U.S.		26	%		28	%		(2	)		(7	%)
Number of events		10			10			—			—

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Total revenues increased 2% and 1% during the three and nine months ended September 30, 2013 compared to the prior year periods, respectively, due to growth in revenues from advisory services and other revenues partially offset by a decline from research services revenues during the three months ended September 30, 2013. Foreign exchange fluctuations accounted for approximately 1% of revenue growth during the quarter and were not material to the year-to-date period in 2013. Revenues from customers outside of the U.S. in the nine months ended September 30, 2013 declined by 2% as a percentage of total revenues compared to the prior year period due primarily to a decline in revenue from the European region. The general economic conditions in Europe as well as sales leadership challenges have contributed to a difficult selling environment in that region.

Research services revenues declined $0.6 million and increased $0.3 million during the three and nine months ended September 30, 2013, respectively, compared to the prior year. Research services revenues are generally recognized as revenue ratably over the term of the contracts, which are generally twelve-month periods. The decline in revenue in the three months ended September 30, 2013 results from the downward trend in the growth in overall contract bookings during the prior twelve month period.

Revenue from advisory services and other increased $1.7 million and $2.0 million during the three and nine months ended September 30, 2013, respectively, compared to the prior year. The increase during the 2013 periods is due entirely to advisory and consulting revenue as event revenues were insignificant during the three months ended September 30, 2013 and declined by $0.3 million during the nine months ended September 30, 2013.

Please refer to the “Segment Results” section below for a discussion of revenue and direct margin results by segment.

Cost of Services and Fulfillment

	Three Months Ended September 30,						Absolute Increase		Percentage Increase
	2013			2012			(Decrease)		(Decrease)
Cost of services and fulfillment (dollars in millions)	$	27.6		$	25.7		$	1.9		7	%
Cost of services and fulfillment as a percentage of total revenues		39.5	%		37.4	%		2.1		6	%
Number of research and fulfillment employees (at end of period)		554			533			21		4	%

	Nine Months Ended September 30,						Absolute Increase		Percentage Increase
	2013			2012			(Decrease)		(Decrease)
Cost of services and fulfillment (dollars in millions)	$	85.4		$	82.5		$	2.9		4	%
Cost of services and fulfillment as a percentage of total revenues		38.8	%		37.9	%		0.9		2	%

The increase in cost of services and fulfillment expenses during the three months ended September 30, 2013 compared to the prior year is primarily due to an increase in compensation costs resulting primarily from an increase in the number of employees, an increase in incentive bonus payments and annual merit increases. The increase in cost of services and fulfillment expenses during the nine months ended September 30, 2013 compared to the prior year is primarily due to an increase in compensation costs due to the aforementioned factors as well as to an increase in facility costs due to new office space in the Asia Pacific region in the second half of 2012. These increases were partially offset by a decrease in professional services fees related to the amount of surveys performed and a decrease in travel and entertainment expenses.

Selling and Marketing

	Three Months Ended September 30,						Absolute Increase		Percentage Increase
	2013			2012			(Decrease)		(Decrease)
Selling and marketing expenses (dollars in millions)	$	25.8		$	24.3		$	1.5		6	%
Selling and marketing expenses as a percentage of total revenues		36.9	%		35.3	%		1.6		5	%
Selling and marketing employees (at end of period)		533			506			27		5	%

	Nine Months Ended September 30,						Absolute Increase		Percentage Increase
	2013			2012			(Decrease)		(Decrease)
Selling and marketing expenses (dollars in millions)	$	79.6		$	75.7		$	3.9		5	%
Selling and marketing expenses as a percentage of total revenues		36.1	%		34.7	%		1.4		4	%

The increase in selling and marketing expenses during the three and nine months ended September 30, 2013 compared to the prior year period is primarily due to an increase in compensation costs resulting from both an increase in sales and marketing employees and incentive bonus payments. In addition, for the nine months ended September 30, 2013, facility costs increased due to new office space in the Asia Pacific region in the second half of 2012.

Subject to the business environment, we intend to expand our quota carrying sales force by approximately 7% to 9% in 2013 as compared to 2012. Any resulting increase in contract bookings of our research services would generally be recognized over a twelve-month period, which typically results in an increase in selling and marketing expense as a percentage of revenues during periods of sales force expansion.

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General and Administrative

	Three Months Ended September 30,						Absolute Increase			Percentage Increase
	2013			2012			(Decrease)			(Decrease)
General and administrative expenses (dollars in millions)	$	9.3		$	8.7		$	0.6			7	%
General and administrative expenses as a percentage of total revenues		13.3	%		12.7	%		0.6			5	%
General and administrative employees (at end of period)		176			179			(3	)		(2	%)

	Nine Months Ended September 30,						Absolute Increase		Percentage Increase
	2013			2012			(Decrease)		(Decrease)
General and administrative expenses (dollars in millions)	$	27.2		$	27.1		$	0.1		—
General and administrative expenses as a percentage of total revenues		12.4	%		12.4	%		0.2		—

The increase in general and administrative expenses during the three months ended September 30, 2013 compared to the prior year is primarily due to an increase in compensation costs due to an increase in incentive bonus payments and annual merit increases and to an increase in professional service fees for recruiting and accounting and tax service fees. The increase in general and administrative expenses during the nine months ended September 30, 2013 compared to the prior year is primarily due to increases as described for the three months ended September 30, 2013, partially offset by a decrease in professional service fees related to information technology projects.

Depreciation

Depreciation expense remained essentially consistent during the three months ended September 30, 2013 compared to the prior year. Depreciation expense increased approximately $0.4 million during the nine months ended September 30, 2013 compared to the prior year primarily resulting from the initiation of depreciation for our new website in March 2012.

Amortization of Intangible Assets

Amortization expense remained essentially consistent during the three and nine months ended September 30, 2013 compared to the prior year.

Reorganization Costs

During the nine months ended September 30, 2013 we incurred $1.9 million of severance and related costs for the elimination of 31 jobs or approximately 2.5% of our workforce worldwide to streamline our operations. All costs incurred for the reorganization are expected to be paid by the end of 2013.

During the nine months ended September 30, 2012 we incurred $1.4 million of severance and related costs for the elimination of 17 jobs in connection with the realignment of our sales force and other cost reduction initiatives.

Other Income (Expense), Net

Other income (expense), net primarily consists of interest income on our investments as well as gains and losses on foreign currency. The decrease in other income (expense), net during the three and nine months ended September 30, 2013 is primarily due to lower interest income earned in 2013 due to lower investment balances.

Gains (Losses) on Investments, Net

Gains (losses) on investments, net primarily represent our share of equity method investment gains (losses) from our technology-related investment funds. The decrease in investment gains during the 2013 periods is primarily due to increased losses at the investment funds due to increased expenses and a decrease in the value of their investments during 2013.

On October 30, 2013 we sold our portfolio of auction rate securities (par value $11.0 million) for a realized loss of $1.9 million, or approximately $(0.09) per diluted share, which will be recognized in our consolidated statement of income as a loss on investments for the three months ended December 31, 2013.

Provision for Income Taxes

	Three Months Ended September 30,						Absolute Increase		Percentage Increase
	2013			2012			(Decrease)		(Decrease)
Provision (benefit) for income taxes (dollars in millions)	$	1.8		$	(2.5	)	$	4.3		173	%
Effective tax rate		42.6	%		(30.5	%)		73.1		240	%

	Nine Months Ended September 30,						Absolute Increase		Percentage Increase
	2013			2012			(Decrease)		(Decrease)
Provision for income taxes (dollars in millions)	$	7.1		$	3.2		$	3.9		121	%
Effective tax rate		39.5	%		13.0	%		26.5		204	%

The increase in the effective tax rate during the three and nine months ended September 30, 2013 as compared to the prior year periods is primarily due to the 2012 periods including a $5.5 million deferred tax benefit resulting from the settlement of a tax audit at one of our foreign subsidiaries. In addition, the 2012 period included a reduction in the reserve for uncertain tax positions as well as a credit due to a remeasurement gain of a euro-denominated deferred tax liability.

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Segment Results

We are organized into two client groups with each client group responsible for writing relevant research for the roles within the client organization on a worldwide basis. The two client groups, which are considered operating segments, are: Business Technology (“BT”) and Marketing and Strategy (“M&S”). In addition, our Events segment supports both client groups. Each client group generates revenues through sales of research, advisory and other service offerings targeted at specific roles within their targeted clients. Each client group consists of research personnel focused primarily on issues relevant to particular roles and to the day-to-day responsibilities of persons within the roles. Amounts included in the Events segment relate to the operations of the events production department. Revenue reported in the Events segment consists primarily of sponsorships and event tickets to Forrester events.

We evaluate reportable segment performance and allocate resources based on direct margin. Direct margin, as presented below, is defined as operating income excluding sales expenses, certain marketing and fulfillment expenses, stock-based compensation expense, general and administrative expenses, depreciation expense, amortization of intangible assets and reorganization costs. In the first quarter of 2013, we modified segment direct margin for each of the BT and M&S clients groups to reflect the transfer of revenue and direct costs related to one product line from BT to M&S and to reallocate certain shared consulting costs between BT and M&S. Accordingly, the 2012 amounts have been reclassified to conform to the current presentation. The accounting policies used by the segments are the same as those used in the consolidated financial statements.

	BT			M&S			Events			Consolidated
Three Months Ended September 30, 2013
Revenue	$	37,659		$	31,809		$	347		$	69,815
Direct margin	$	24,912		$	20,923		$	(656	)	$	45,179
Year over year revenue growth		—			4	%		15	%		2	%
Direct margin percentage		66.2	%		65.8	%		(189	%)		64.7	%
	BT			M&S			Events			Consolidated
Three Months Ended September 30, 2012
Revenue	$	37,764		$	30,707		$	302		$	68,773
Direct margin	$	25,966		$	20,203		$	(727	)	$	45,442
Direct margin percentage		68.8	%		65.8	%		(241	%)		66.1	%
	BT			M&S			Events			Consolidated
Nine Months Ended September 30, 2013
Revenue	$	115,327		$	95,690		$	9,112		$	220,129
Direct margin	$	78,100		$	62,909		$	3,204		$	144,213
Year over year revenue growth		—			3	%		(3	%)		1	%
Direct margin percentage		67.7	%		65.7	%		35.2	%		65.5	%
	BT			M&S			Events			Consolidated
Nine Months Ended September 30, 2012
Revenue	$	115,470		$	92,995		$	9,405		$	217,870
Direct margin	$	78,882		$	60,823		$	3,241		$	142,946
Direct margin percentage		68.3	%		65.4	%		34.5	%		65.6	%

BT revenue was essentially flat during the three and nine months ended September 30, 2013, compared to the prior year periods. Research services revenue decreased 2% during the three months ended September 30, 2013 and was essentially flat during the nine months ended September 30, 2013 as compared to the prior year periods. Advisory and consulting services revenue increased 5% during the three months ended September 30, 2013 and decreased 1% during the nine months ended September 30, 2013 compared to the prior year periods. The increase in advisory and consulting revenue during the three months ended September 30, 2013 is primarily due to an increase in headcount during the period. The decrease in direct margin percentage during the three and nine months ended September 30, 2013 compared to the prior year periods is due primarily to an increase in compensation costs from increased headcount and annual salary increases combined with flat revenue during the periods.

M&S revenue increased 4% and 3% during the three and nine months ended September 30, 2013, respectively, compared to the prior year periods due to a 14% and 10% increase in advisory and consulting revenue, respectively, while research services revenue was essentially flat for both periods. The increase in advisory and consulting revenue during 2013 is primarily due to increased productivity during the periods. Direct margin percentage during the three and nine months ended September 30, 2013 remained consistent compared to the prior year periods.

Events revenue was insignificant during the three months ended September 30, 2013 as we held three small events in the Asia / Pacific region. Events revenue for the nine months ended September 30, 2013 decreased 3% compared to the prior year period due to a decline in ticket revenue partially offset by a small increase in sponsorship revenue. Direct margin increased during the three and nine months ended September 30, 2013 compared to the prior year periods due to tight cost controls in light of the lower revenue.

Liquidity and Capital Resources

We have historically financed our operations primarily through funds generated from operations. Memberships for research services, which constituted approximately 69% of our revenues during the nine months ended September 30, 2013, are annually renewable and are generally payable in advance. We generated cash from operating activities of $32.4 million and $42.8 million during the nine months ended September 30, 2013 and 2012, respectively. The $10.4 million decrease in cash provided from operations for the nine months ended September 30, 2013 is primarily attributable to a decrease in net income of $10.6 million for the nine months ended September 30, 2013 compared to the prior year period.

During the nine months ended September 30, 2013, we generated $43.8 million of cash from investing activities, consisting primarily of $45.8 million in net maturities of marketable investments partially offset by $2.0 million of purchases of property and equipment. Property and equipment purchases during the 2013 period consisted primarily of software and leasehold improvements. We expect property and equipment purchases to be in the range of $3.0 million to $5.0 million in 2013. During the

21

nine months ended September 30, 2012, we used $15.5 million of cash from investing activities, consisting primarily of $12.2 million in net purchases of marketable investments and $4.4 million of purchases of property and equipment. Property and equipment purchases during the 2012 period consisted primarily of software and computer equipment. We regularly invest excess funds in short and intermediate-term interest-bearing obligations of investment grade.

We used $104.3 million of cash from financing activities during the nine months ended September 30, 2013 primarily due to $109.2 million of purchases of our common stock, of which $75.1 million (including expenses) was purchased through our modified Dutch auction self-tender offer (described below) and $34.1 million was purchased on the open market subsequent to completion of the self-tender offer. In addition, during the 2013 period we paid $9.4 million of dividends consisting of a $0.15 per share dividend in each of the first three quarters of 2013 and we received $14.5 million of proceeds from the exercise of stock options and our employee stock purchase plan. We used $27.6 million of cash from financing activities during the nine months ended September 30, 2012 resulting from $26.2 million of purchases of our common stock and $9.5 million of dividend payments, partially offset by $8.5 million of proceeds from exercises of stock options and our employee stock purchase plan.

On April 3, 2013 we commenced a modified Dutch auction self-tender offer to repurchase up to $130 million of our common stock at a price per share within the range of $32.00 to $36.00. A modified Dutch auction self-tender offer allows stockholders to indicate how many shares and at what price within the company’s specified range (in increments of $0.25 per share) they wish to tender. When the tender offer expired, based upon the number of shares tendered and the prices specified by the tendering stockholders, we determined the purchase price, which was the lowest price per share within the range that enabled us to purchase up to $130 million of our common stock. The tender offer expired on May 1, 2013 and we purchased 2,054,732 shares of our common stock on May 7, 2013 at a purchase price of $36.00 per share for an aggregate purchase price of $74.0 million plus $1.1 million of expenses related to the tender offer. We funded the repurchase from cash and marketable securities on hand.

In July 2013 our board of directors increased our stock repurchase authorization by $25 million. As of September 30, 2013 our remaining stock repurchase authorization was approximately $65.0 million. We plan to continue to repurchase our common stock during the remainder of 2013, as market conditions warrant.

As of September 30, 2013, we held approximately $9.1 million ($11.0 million par value) of state and municipal bonds with an auction reset feature (auction rate securities or “ARS”). In February 2008, auctions began to fail for these securities and continued to fail through September 30, 2013. On October 30, 2013 we sold our entire portfolio of ARS for net proceeds of $9.1 million and realized a loss on the sale of $1.9 million.

As of September 30, 2013, we had cash and cash equivalents of $70.7 million and marketable investments of $96.1 million. We do not currently have a line of credit and do not presently anticipate the need to access a line of credit in the foreseeable future except in the case of a significant acquisition. We believe that our current cash balance, marketable investments, and cash flows from operations will satisfy working capital, financing activities, and capital expenditure requirements for at least the next two years.

Contractual Obligations

There have been no material changes to the contractual obligations table as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2012.

Off-Balance Sheet Arrangements

We do not maintain any off-balance sheet financing arrangements.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There have been no material changes in our assessment of our sensitivity to market risk since our presentation set forth in Item 7A, “Quantitative and Qualitative Disclosures About Market Risk,” in our Annual Report on Form 10-K for the year ended December 31, 2012.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

We maintain “disclosure controls and procedures,” as such term is defined under Securities Exchange Act Rule 13a-15(e), that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosures. In designing and evaluating the disclosure controls and procedures, our management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives and our management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Our management, with the participation of our principal executive officer and principal financial officer, has evaluated the effectiveness of our disclosure controls and procedures as of September 30, 2013. Based upon their evaluation and subject to the foregoing, the principal executive officer and principal financial officer concluded that, because of the material weaknesses described below, our disclosure controls and procedures were not effective as of September 30, 2013. Notwithstanding such material weaknesses, management believes that the unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q fairly present, in all material respects, our financial condition, results of operations and cash flows for the periods presented in conformity with accounting principles generally accepted in the United States.

Management identified the following control deficiencies as of September 30, 2013 that constituted material weaknesses:

We did not maintain effective controls over the recognition of revenue related to the event tickets that are included in certain of our subscription products. Specifically, we did not operate effective controls to determine that the amount of revenue recognized for these event tickets was accurate during the three months ended June 30, 2013 and September 30, 2013. This control deficiency resulted in the misstatement of our research services revenue and related financial disclosures, and the revision of the Company’s consolidated financial statements for the quarter and six months ended June 30, 2013 as described in Note 1 of the Consolidated Financial Statements. In addition, this deficiency could have resulted in a misstatement of the Company’s annual or interim consolidated financial statements that would have been material and would not have been prevented or detected. Accordingly, management has determined that the deficiency described above constitutes a material weakness and that our internal control over financial reporting was not effective as of September 30, 2013.

In addition, as of December 31, 2012, we reported that management had identified a material weakness in the Company’s internal control over financial reporting related to revenue for advisory services and consulting projects. Specifically, we did not design and operate effective controls to evidence that our advisory services and consulting projects were monitored for services performed in support of the revenue recognized. Although the deficiency did not result in the identification of a material misstatement during 2012, this deficiency could have resulted in a misstatement of the Company’s annual or interim consolidated financial statements that would have been material and would not have been prevented or detected. This material weakness in our internal control over financial reporting continued to exist as of September 30, 2013.

A material weakness is a deficiency, or combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company’s annual or interim financial statements will not be prevented or detected on a timely basis.

Remediation Plans

The remedial efforts as outlined below are intended to address the identified material weaknesses and to enhance our overall control environment.

Advisory Services and Consulting Projects

1. Consulting Project Scoping: During the scoping phase of each project, we will ensure that evidence is maintained of the review and approval of the allocation of the project revenue to the services to be delivered to the client and that the project allocation is accurately entered into our accounting system.

2. Advisory Services and Consulting Project Performance: Our project managers will more closely monitor the performance of each advisory service and consulting project and will maintain evidence of their review and approval of the services performed.

3. Training: We will ensure that we conduct proper training so that the remedial actions identified above are understood and followed by applicable personnel.

Although we have implemented and tested the additional controls as detailed in our remediation plan above, the controls have not been in place and operating for a sufficient period to validate remediation. Management believes these efforts will effectively remediate the material weakness.

Event Tickets Included In Subscription Products

1. Additional procedures will be implemented to reconcile the inputs in the manual calculation to additional data contained in our accounting system. New accounting system reports will be generated to facilitate the reconciliation.

2. Analytical procedures will be implemented and performed by our financial planning and analysis group (this group is separate from the accounting group that prepares the referenced calculations) to assess the reasonableness of the amount of event revenue recognized.

Management believes these efforts will effectively remediate the material weakness.

22

Changes in Internal Control Over Financial Reporting

Except for the implementation of the additional controls as described under “Remediation Plans – Advisory Services and Consulting Projects” above, there was no change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the quarter ended September 30, 2013 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1A. RISK FACTORS

In addition to the other information set forth in this Form 10-Q, you should carefully consider the factors discussed in Part I, “Item 1A: Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2012, which could materially affect our business, financial condition or future results. The risk factors described in our Annual Report on Form 10-K remain applicable to our business. The risks described in our Annual Report on Form 10-K are not the only risks that we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Our Board of Directors has authorized an aggregate $385.0 million to purchase common stock under our stock repurchase program, including $25.0 million authorized in July 2013, $50 million authorized in February 2013, and $50.0 million authorized in 2012. During the quarter ended September 30, 2013, we purchased the following shares of our common stock under the stock repurchase program:

Period	Total Number of Shares Purchased (1)		Average Price Paid per Share		Maximum Dollar Value that May Yet be Purchased Under the Stock Repurchase Program
					(In thousands)
July 1—July 31		106,300	$	36.73
August 1—August 31		196,295	$	34.37
September 1—September 30		190,382	$	33.93	$	64,966
		492,977

(1) All purchases of our common stock were made under the stock repurchase program first announced in 2001.

ITEM 6. EXHIBITS

31.1	Certification of the Principal Executive Officer. (filed herewith)
31.2	Certification of the Principal Financial Officer. (filed herewith)
32.1	Certification of the Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (furnished herewith)
32.2	Certification of the Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (furnished herewith)
101.INS	XBRL Instance Document. (filed herewith)
101.SCH	XBRL Taxonomy Extension Schema. (filed herewith)
101.CAL	XBRL Taxonomy Extension Calculation Linkbase. (filed herewith)
101.DEF	XBRL Taxonomy Extension Definition Linkbase. (filed herewith)
101.LAB	XBRL Taxonomy Extension Label Linkbase. (filed herewith)
101.PRE	XBRL Taxonomy Extension Presentation Linkbase. (filed herewith)

23

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

FORRESTER RESEARCH, INC.
By:	/s/ Michael A. Doyle
	Michael A. Doyle
	Chief Financial Officer and Treasurer (Principal financial officer)

Date: November 12, 2013

24

Exhibit Index

Exhibit No.	Document
31.1	Certification of the Principal Executive Officer. (filed herewith)
31.2	Certification of the Principal Financial Officer. (filed herewith)
32.1	Certification of the Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (furnished herewith)
32.2	Certification of the Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (furnished herewith)
101.INS	XBRL Instance Document. (filed herewith)
101.SCH	XBRL Taxonomy Extension Schema. (filed herewith)
101.CAL	XBRL Taxonomy Extension Calculation Linkbase. (filed herewith)
101.DEF	XBRL Taxonomy Extension Definition Linkbase. (filed herewith)
101.LAB	XBRL Taxonomy Extension Label Linkbase. (filed herewith)
101.PRE	XBRL Taxonomy Extension Presentation Linkbase. (filed herewith)

25

EX-31.1

Exhibit 31.1

CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICER

I, George F. Colony, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Forrester Research, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ GEORGE F. COLONY

George F. Colony

Chairman of the Board and Chief Executive Officer

(Principal executive officer)

Date: November 12, 2013

EX-31.2

Exhibit 31.2

CERTIFICATION OF THE PRINCIPAL FINANCIAL OFFICER

I, Michael A. Doyle, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Forrester Research, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ MICHAEL A. DOYLE

Michael A. Doyle

Chief Financial Officer and Treasurer

(Principal financial officer)

Date: November 12, 2013

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, as Chief Executive Officer of Forrester Research, Inc. (the “Company”), does hereby certify that to the undersigned’s knowledge:

1) the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2013, as filed with the Securities and Exchange Commission (the “10-Q Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2) the information contained in the 10-Q Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ George F. Colony

George F. Colony

Chairman of the Board and

Chief Executive Officer

Dated: November 12, 2013

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, as Chief Financial Officer of Forrester Research, Inc. (the “Company”), does hereby certify that to the undersigned’s knowledge:

1) the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2013, as filed with the Securities and Exchange Commission (the “10-Q Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2) the information contained in the 10-Q Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ MICHAEL A. DOYLE

Michael A. Doyle

Chief Financial Officer and Treasurer

Dated: November 12, 2013

XML

Recent Accounting Pronouncements (Policies)

9 Months Ended

Sep. 30, 2013

Accounting Changes And Error Corrections [Abstract]

Intangibles - Goodwill and Other

In July 2012, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2012-02, Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment. This accounting standard allows an entity the option to first assess qualitative factors to determine whether it is necessary to perform a quantitative impairment test for indefinite-lived intangibles other than goodwill. Under that option, an entity would no longer be required to calculate the fair value of an indefinite-lived intangible asset unless the entity determines, based on that qualitative assessment, that it is more likely than not that the fair value of the indefinite-lived intangible asset is less than its carrying amount. This ASU was effective for annual and interim indefinite-lived intangible asset impairment tests performed for fiscal years beginning after September 15, 2012. As the Company does not have any indefinite-lived intangible assets as of September 30, 2013 other than goodwill, the adoption of this standard on January 1, 2013 did not have an impact on the Company’s consolidated financial results.

Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income

In February 2013, the FASB issued ASU No. 2013-02, Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income. This accounting standard requires companies to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, companies are required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. This ASU is effective for reporting periods beginning after December 15, 2012. Other than requiring additional disclosures, adoption of this ASU did not have a significant impact on the Company’s consolidated financial results.

XML

Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Research services	$ 49,855	$ 50,509	$ 151,445	$ 151,145
Advisory services and other	19,960	18,264	68,684	66,725
Total revenues	69,815	68,773	220,129	217,870
Operating expenses:
Cost of services and fulfillment	27,584	25,736	85,397	82,502
Selling and marketing	25,771	24,309	79,617	75,709
General and administrative	9,310	8,720	27,217	27,124
Depreciation	2,292	2,262	6,954	6,510
Amortization of intangible assets	557	579	1,670	1,779
Reorganization costs		37	1,905	1,431
Total operating expenses	65,514	61,643	202,760	195,055
Income from operations	4,301	7,130	17,369	22,815
Other income (expense), net	(71)	357	560	896
Gains (losses) on investments, net	18	755	(84)	898
Income before income taxes	4,248	8,242	17,845	24,609
Income tax provision (benefit)	1,813	(2,468)	7,056	3,191
Net income	$ 2,435	$ 10,710	$ 10,789	$ 21,418
Basic income per common share	$ 0.12	$ 0.48	$ 0.51	$ 0.95
Diluted income per common share	$ 0.12	$ 0.47	$ 0.50	$ 0.93
Basic weighted average common shares outstanding	20,117	22,398	21,226	22,573
Diluted weighted average common shares outstanding	20,665	22,858	21,690	23,018
Cash dividends declared per common share	$ 0.15	$ 0.14	$ 0.45	$ 0.42

XML

Non-Marketable Investments

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Non-Marketable Investments

Note 3 — Non-Marketable Investments

At September 30, 2013 and December 31, 2012, the carrying value of the Company’s non-marketable investments, which were composed primarily of interests in technology-related private equity funds, was $6.2 million and $6.6 million, respectively, and is included in other assets in the Consolidated Balance Sheets.

One of the Company’s investments, with a book value of $0.9 million and $1.2 million at September 30, 2013 and December 31, 2012, 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. The Company recorded a gain (loss) from its non-marketable investments of $(0.1) million during the nine months ended September 30, 2013, and $0.8 million and $0.9 million during the three and nine months ended September 30, 2012, respectively, which is included in gains (losses) on investments, net in the Consolidated Statements of Income. Gains on investments were insignificant during the three months ended September 30, 2013.

In May 2013, the Company extended the expiration date of a cash bonus plan, originally adopted in 2000, that would pay a bonus, after the return of invested capital from certain of the Company’s investments, to certain key employees. To date, no bonuses have been paid under the plan. The plan will now automatically expire on June 30, 2015, subject to earlier expiration as provided in the plan in the event that prior to such date there are less than 10 participants in the plan or all of the Company’s invested capital (as defined in the plan) has been returned to the Company.

XML

Interim Consolidated Financial Statements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended	12 Months Ended	3 Months Ended				12 Months Ended		3 Months Ended				6 Months Ended	12 Months Ended		3 Months Ended
	Jun. 30, 2013 Research Service Revenue [Member]	Sep. 30, 2012 Research Service Revenue [Member]	Mar. 31, 2012 Research Service Revenue [Member]	Jun. 30, 2013 Research Service Revenue [Member]	Dec. 31, 2011 Research Service Revenue [Member]	Jun. 30, 2013 Technology Related Investment Funds [Member]	Mar. 31, 2013 Technology Related Investment Funds [Member]	Dec. 31, 2012 Technology Related Investment Funds [Member]	Sep. 30, 2012 Technology Related Investment Funds [Member]	Dec. 31, 2012 Technology Related Investment Funds [Member]	Dec. 31, 2011 Technology Related Investment Funds [Member]	Mar. 31, 2013 Adjustments Related to Insignificant Variances in Deferred Revenue [Member]	Dec. 31, 2012 Adjustments Related to Insignificant Variances in Deferred Revenue [Member]	Sep. 30, 2012 Adjustments Related to Insignificant Variances in Deferred Revenue [Member]	Jun. 30, 2012 Adjustments Related to Insignificant Variances in Deferred Revenue [Member]	Jun. 30, 2013 Adjustments Related to Insignificant Variances in Deferred Revenue [Member]	Dec. 31, 2012 Adjustments Related to Insignificant Variances in Deferred Revenue [Member]	Dec. 31, 2011 Adjustments Related to Insignificant Variances in Deferred Revenue [Member]	Dec. 31, 2012 Adjustments Related to Improper Capitalization of Software Development Costs [Member]	Sep. 30, 2012 Adjustments Related to Improper Capitalization of Software Development Costs [Member]	Jun. 30, 2012 Adjustments Related to Improper Capitalization of Software Development Costs [Member]
Adjustments related to prior period errors	$ 0.8	$ 0.1	$ (0.1)	$ 0.8	$ 0.1	$ 0.1	$ (0.1)	$ (0.1)	$ 0.6	$ 0.5	$ (1.4)	$ (0.1)	$ 0.1	$ 0.2	$ (0.2)	$ (0.1)	$ 0.1	$ (0.4)	$ (0.5)	$ 0.3	$ 0.2

XML

Interim Consolidated Financial Statements (Tables)

9 Months Ended

Sep. 30, 2013

Quarterly Financial Information Disclosure [Abstract]

Revised Consolidated Statements of Income

The effects of these prior period errors on the consolidated financial statements are as follows (in thousands, except per share amounts):

Revised Consolidated Statements of Income

	Three Months Ended March 31, 2013									Three Months Ended June 30, 2013								Six Months Ended June 30, 2013
	As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Revenues:
Research services	$	50,378		$	(100	)	$	50,278		$	50,512		$	800		$	51,312	$	100,890		$	700		$	101,590
Advisory services and other		21,121			(38	)		21,083			27,652			(11	)		27,641		48,773			(49	)		48,724
Total revenues		71,499			(138	)		71,361			78,164			789			78,953		149,663			651			150,314
Income from operations		3,418			(138	)		3,280			8,999			789			9,788		12,417			651			13,068
Gains (losses) on investments, net		(51	)		(149	)		(200	)		(51	)		149			98		(102	)		—			(102	)
Income before income taxes		3,743			(287	)		3,456			9,203			938			10,141		12,946			651			13,597
Income tax provision		1,402			(115	)		1,287			3,581			375			3,956		4,983			260			5,243
Net income	$	2,341		$	(172	)	$	2,169		$	5,622		$	563		$	6,185	$	7,963		$	391		$	8,354
Basic income per common share	$	0.10		$	—		$	0.10		$	0.26		$	0.03		$	0.29	$	0.37		$	0.01		$	0.38
Diluted income per common share	$	0.10		$	—		$	0.10		$	0.26		$	0.02		$	0.28	$	0.36		$	0.02		$	0.38

	Nine Months Ended September 30, 2012							Three Months Ended December 31, 2012									Full Year Ended December 31, 2012
	As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments		As Revised
Revenues:
Research services	$	151,132	$	13		$	151,145	$	51,866		$	80		$	51,946		$	202,998		$	93	$	203,091
Advisory services and other		66,732		(7	)		66,725		23,200			15			23,215			89,932			8		89,940
Total revenues		217,864		6			217,870		75,066			95			75,161			292,930			101		293,031
Operating expenses:
General and administrative		26,667		457			27,124		10,199			(457	)		9,742			36,866			—		36,866
Total operating expenses		194,598		457			195,055		67,673			(457	)		67,216			262,271			—		262,271
Income from operations		23,266		(451	)		22,815		7,393			552			7,945			30,659			101		30,760
Gains (losses) on investments, net		290		608			898		(739	)		(65	)		(804	)		(449	)		543		94
Income before income taxes		24,452		157			24,609		7,058			487			7,545			31,510			644		32,154
Income tax provision		3,129		62			3,191		2,807			195			3,002			5,936			257		6,193
Net income	$	21,323	$	95		$	21,418	$	4,251		$	292		$	4,543		$	25,574		$	387	$	25,961
Basic income per common share	$	0.94	$	0.01		$	0.95	$	0.19		$	0.01		$	0.20		$	1.14		$	0.01	$	1.15
Diluted income per common share	$	0.93	$	—		$	0.93	$	0.19		$	0.01		$	0.20		$	1.12		$	0.01	$	1.13

	Three Months Ended June 30, 2012							Six Months Ended June 30, 2012							Three Months Ended September 30, 2012
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Revenues:
Research services	$	51,072	$	(100	)	$	50,972	$	100,832	$	(196	)	$	100,636	$	50,300		$	209		$	50,509
Advisory services and other		28,021		(61	)		27,960		48,521		(60	)		48,461		18,211			53			18,264
Total revenues		79,093		(161	)		78,932		149,353		(256	)		149,097		68,511			262			68,773
Operating expenses:
General and administrative		8,645		148			8,793		18,256		148			18,404		8,411			309			8,720
Total operating expenses		67,632		148			67,780		133,264		148			133,412		61,334			309			61,643
Income from operations		11,461		(309	)		11,152		16,089		(404	)		15,685		7,177			(47	)		7,130
Gains (losses) on investments, net		84		—			84		143		—			143		147			608			755
Income before income taxes		11,675		(309	)		11,366		16,771		(404	)		16,367		7,681			561			8,242
Income tax provision		3,906		(124	)		3,782		5,821		(162	)		5,659		(2,692	)		224			(2,468	)
Net income	$	7,769	$	(185	)	$	7,584	$	10,950	$	(242	)	$	10,708	$	10,373		$	337		$	10,710
Basic income per common share	$	0.34	$	—		$	0.34	$	0.48	$	(0.01	)	$	0.47	$	0.46		$	0.02		$	0.48
Diluted income per common share	$	0.34	$	(0.01	)	$	0.33	$	0.47	$	(0.01	)	$	0.46	$	0.45		$	0.02		$	0.47

	Three Months Ended March 31, 2012							Full Year Ended December 31, 2011
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised
Revenues:
Research services	$	49,760	$	(96	)	$	49,664	$	191,648	$	(153	)	$	191,495
Advisory services and other		20,500		1			20,501		91,968		(128	)		91,840
Total revenues		70,260		(95	)		70,165		283,616		(281	)		283,335
Income from operations		4,628		(95	)		4,533		36,997		(281	)		36,716
Gains (losses) on investments, net		59		—			59		1,018		(1,417	)		(399	)
Income before income taxes		5,096		(95	)		5,001		38,645		(1,698	)		36,947
Income tax provision		1,915		(38	)		1,877		15,635		(679	)		14,956
Net income	$	3,181	$	(57	)	$	3,124	$	23,010	$	(1,019	)	$	21,991
Basic income per common share	$	0.14	$	—		$	0.14	$	1.02	$	(0.05	)	$	0.97
Diluted income per common share	$	0.14	$	(0.01	)	$	0.13	$	0.99	$	(0.04	)	$	0.95

Revised Consolidated Statements of Comprehensive Income

Revised Consolidated Statements of Comprehensive Income

The consolidated statements of comprehensive income for all periods is impacted by the same amount as net income for the respective period.

Revised Consolidated Balance Sheet

Revised Consolidated Balance Sheet

	As of December 31, 2012
	As Previously Reported		Adjustments			As Revised
Current Assets:
Prepaid expenses and other current assets	$	18,846	$	132		$	18,978
Total current assets		336,565		132			336,697
Other assets		9,123		(314	)		8,809
Total assets	$	487,832	$	(182	)	$	487,650
Current Liabilities:
Deferred revenue	$	150,479	$	16		$	150,495
Total current liabilities		181,329		16			181,345
Total liabilities		190,762		16			190,778
Retained earnings		117,648		(198	)		117,450
Total stockholders’ equity		297,070		(198	)		296,872
Total liabilities and stockholders’ equity	$	487,832	$	(182	)	$	487,650

Revised Consolidated Statements of Cash Flows

Revised Consolidated Statements of Cash Flows

	Three Months Ended March 31, 2013							Six Months Ended June 30, 2013
	As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Cash flows from operating activities:
Net income	$	2,341	$	(172	)	$	2,169	$	7,963		$	391		$	8,354
Net (gains) losses from investments		51		149			200		102			—			102
Prepaid expenses and other current assets		1,271		(115	)		1,156		4,619			260			4,879
Deferred revenue		2,709		138			2,847		(12,955	)		(651	)		(13,606	)
Net cash provided by operating activities		35,453		—			35,453		37,231			—			37,231

	Nine Months Ended September 30, 2012									Year Ended December 31, 2012									Year Ended December 31, 2011
	As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised
Cash flows from operating activities:
Net income	$	21,323		$	95		$	21,418		$	25,574		$	387		$	25,961		$	23,010		$	(1,019	)	$	21,991
Net (gains) losses from investments		(290	)		(608	)		(898	)		449			(543	)		(94	)		(1,018	)		1,417			399
Prepaid expenses and other current assets		3,929			62			3,991			6,279			257			6,536			(7,805	)		(679	)		(8,484	)
Deferred revenue		(23,302	)		(6	)		(23,308	)		1,807			(101	)		1,706			16,364			281			16,645
Net cash provided by operating activities		43,223			(457	)		42,766			53,147			—			53,147			55,444			—			55,444
Purchases of property and equipment		(4,845	)		457			(4,388	)		(5,103	)		—			(5,103	)		(39,776	)		—			(39,776	)
Net cash provided by (used in) investing activities		(15,989	)		457			(15,532	)		(4,076	)		—			(4,076	)		(53,036	)		—			(53,036	)

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Net Income Per Common Share - Summary of Basic and Diluted Weighted Average Common Shares (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	20,117	22,398	21,226	22,573
Weighted average common equivalent shares	548	460	464	445
Diluted weighted average common shares outstanding	20,665	22,858	21,690	23,018
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive	608	967	700	644

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Interim Consolidated Financial Statements - Revised Consolidated Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended						6 Months Ended		9 Months Ended	12 Months Ended		3 Months Ended						6 Months Ended		9 Months Ended	12 Months Ended		3 Months Ended						6 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 As Previously Reported [Member]	Mar. 31, 2013 As Previously Reported [Member]	Dec. 31, 2012 As Previously Reported [Member]	Sep. 30, 2012 As Previously Reported [Member]	Jun. 30, 2012 As Previously Reported [Member]	Mar. 31, 2012 As Previously Reported [Member]	Jun. 30, 2013 As Previously Reported [Member]	Jun. 30, 2012 As Previously Reported [Member]	Sep. 30, 2012 As Previously Reported [Member]	Dec. 31, 2012 As Previously Reported [Member]	Dec. 31, 2011 As Previously Reported [Member]	Jun. 30, 2013 Adjustments [Member]	Mar. 31, 2013 Adjustments [Member]	Dec. 31, 2012 Adjustments [Member]	Sep. 30, 2012 Adjustments [Member]	Jun. 30, 2012 Adjustments [Member]	Mar. 31, 2012 Adjustments [Member]	Jun. 30, 2013 Adjustments [Member]	Jun. 30, 2012 Adjustments [Member]	Sep. 30, 2012 Adjustments [Member]	Dec. 31, 2012 Adjustments [Member]	Dec. 31, 2011 Adjustments [Member]	Jun. 30, 2013 As Revised [Member]	Mar. 31, 2013 As Revised [Member]	Dec. 31, 2012 As Revised [Member]	Sep. 30, 2012 As Revised [Member]	Jun. 30, 2012 As Revised [Member]	Mar. 31, 2012 As Revised [Member]	Jun. 30, 2013 As Revised [Member]	Jun. 30, 2012 As Revised [Member]	Sep. 30, 2012 As Revised [Member]	Dec. 31, 2012 As Revised [Member]	Dec. 31, 2011 As Revised [Member]
Cash flows from operating activities:
Net income	$ 2,435	$ 10,710	$ 10,789	$ 21,418	$ 5,622	$ 2,341	$ 4,251	$ 10,373	$ 7,769	$ 3,181	$ 7,963	$ 10,950	$ 21,323	$ 25,574	$ 23,010	$ 563	$ (172)	$ 292	$ 337	$ (185)	$ (57)	$ 391	$ (242)	$ 95	$ 387	$ (1,019)	$ 6,185	$ 2,169	$ 4,543	$ 10,710	$ 7,584	$ 3,124	$ 8,354	$ 10,708	$ 21,418	$ 25,961	$ 21,991
Net (gains) losses from investments	(18)	(755)	84	(898)	51	51	739	(147)	(84)	(59)	102	(143)	(290)	449	(1,018)	(149)	149	65	(608)					(608)	(543)	1,417	(98)	200	804	(755)	(84)	(59)	102	(143)	(898)	(94)	399
Prepaid expenses and other current assets			3,683	3,991		1,271					4,619		3,929	6,279	(7,805)		(115)					260		62	257	(679)		1,156					4,879		3,991	6,536	(8,484)
Deferred revenue			(25,002)	(23,308)		2,709					(12,955)		(23,302)	1,807	16,364		138					(651)		(6)	(101)	281		2,847					(13,606)		(23,308)	1,706	16,645
Net cash provided by operating activities			32,352	42,766		35,453					37,231		43,223	53,147	55,444									(457)				35,453					37,231		42,766	53,147	55,444
Purchases of property and equipment			2,049	4,388									(4,845)	(5,103)	(39,776)									457											(4,388)	(5,103)	(39,776)
Net cash provided by (used in) investing activities			$ 43,847	$ (15,532)									$ (15,989)	$ (4,076)	$ (53,036)									$ 457											$ (15,532)	$ (4,076)	$ (53,036)

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Interim Consolidated Financial Statements - Revised Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets:
Prepaid expenses and other current assets	$ 18,645	$ 18,978
Total current assets	221,723	336,697
Other assets	11,166	8,809
Total assets	368,828	487,650
Current Liabilities:
Deferred revenue	125,787	150,495
Total current liabilities	151,889	181,345
Total liabilities	160,861	190,778
Retained earnings	118,814	117,450
Total stockholders' equity	207,967	296,872
Total liabilities and stockholders' equity	368,828	487,650
As Previously Reported [Member]
Current Assets:
Prepaid expenses and other current assets		18,846
Total current assets		336,565
Other assets		9,123
Total assets		487,832
Current Liabilities:
Deferred revenue		150,479
Total current liabilities		181,329
Total liabilities		190,762
Retained earnings		117,648
Total stockholders' equity		297,070
Total liabilities and stockholders' equity		487,832
Adjustments [Member]
Current Assets:
Prepaid expenses and other current assets		132
Total current assets		132
Other assets		(314)
Total assets		(182)
Current Liabilities:
Deferred revenue		16
Total current liabilities		16
Total liabilities		16
Retained earnings		(198)
Total stockholders' equity		(198)
Total liabilities and stockholders' equity		(182)
As Revised [Member]
Current Assets:
Prepaid expenses and other current assets		18,978
Total current assets		336,697
Other assets		8,809
Total assets		487,650
Current Liabilities:
Deferred revenue		150,495
Total current liabilities		181,345
Total liabilities		190,778
Retained earnings		117,450
Total stockholders' equity		296,872
Total liabilities and stockholders' equity		$ 487,650

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Operating Segments - Summary of Information about Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 69,815	$ 68,773	$ 220,129	$ 217,870
Direct margin	45,179	45,442	144,213	142,946
Selling, marketing, administrative and other expenses	(40,321)	(37,696)	(123,269)	(116,921)
Amortization of intangible assets	(557)	(579)	(1,670)	(1,779)
Reorganization costs		(37)	(1,905)	(1,431)
Other income (expense) and gains (losses) on investments	(53)	1,112	476	1,794
Income before income taxes	4,248	8,242	17,845	24,609
BT [Member]
Segment Reporting Information [Line Items]
Revenue	37,659	37,764	115,327	115,470
Direct margin	24,912	25,966	78,100	78,882
Selling, marketing, administrative and other expenses
Amortization of intangible assets
Reorganization costs
Other income (expense) and gains (losses) on investments
Income before income taxes
M&S [Member]
Segment Reporting Information [Line Items]
Revenue	31,809	30,707	95,690	92,995
Direct margin	20,923	20,203	62,909	60,823
Selling, marketing, administrative and other expenses
Amortization of intangible assets
Reorganization costs
Other income (expense) and gains (losses) on investments
Income before income taxes
Events [Member]
Segment Reporting Information [Line Items]
Revenue	347	302	9,112	9,405
Direct margin	(656)	(727)	3,204	3,241
Selling, marketing, administrative and other expenses
Amortization of intangible assets
Reorganization costs
Other income (expense) and gains (losses) on investments
Income before income taxes

XML

Marketable Investments - Summary of Changes in Fair Value of Level 3 Financial Assets (Detail) (ARS [Member], Level 3 [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
ARS [Member] | Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets, Beginning Balance	$ 8,970	$ 9,565
Sales
Gains included in other comprehensive income	122	224
Fair value of assets, Ending Balance	$ 9,092	$ 9,789

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Stockholders' Equity - Details of Restricted Stock Unit Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Unvested at December 31, 2012	301
Number of Shares, Granted	207
Number of Shares, Vested or settled	(67)
Number of Shares, Forfeited	(56)
Number of Shares, Unvested at September 30, 2013	385
Weighted Average Grant Date Fair Value, Unvested, Beginning Balance	$ 32.98
Weighted Average Grant Date Fair Value, Granted	$ 34.58
Weighted Average Grant Date Fair Value, Vested or settled	$ 32.91
Weighted Average Grant Date Fair Value, Forfeited	$ 31.02
Weighted Average Grant Date Fair Value , Unvested, Ending Balance	$ 34.14

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Marketable Investments - Summary of Company's Fair Value Hierarchy for its Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	$ 103,164	$ 176,774
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	7,111	815
State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	9,665	18,872
Federal Agency and Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	77,296	148,117
ARS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	9,092	8,970
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	7,111	815
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	7,111	815
Level 1 [Member] | State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis
Level 1 [Member] | Federal Agency and Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis
Level 1 [Member] | ARS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	86,961	166,989
Level 2 [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
Level 2 [Member] | State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	9,665	18,872
Level 2 [Member] | Federal Agency and Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	77,296	148,117
Level 2 [Member] | ARS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	9,092	8,970
Level 3 [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
Level 3 [Member] | State and Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis
Level 3 [Member] | Federal Agency and Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis
Level 3 [Member] | ARS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets on recurring basis	$ 9,092	$ 8,970

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Stockholders' Equity - Assumptions for Valuation of Options Granted under Equity Incentive Plans and Shares Subject to Purchase under Employee Stock Purchase Plan (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	1.40%	0.62%	0.81%	0.87%
Expected dividend yield	2.10%	1.70%	2.10%	1.70%
Expected life	4 years 10 months 24 days	4 years 6 months 0 days	4 years 10 months 24 days	4 years 6 months 0 days
Expected volatility	36.00%	40.00%	37.00%	40.00%
Weighted average fair value	$ 9.94	$ 9.42	$ 9.15	$ 9.81
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	0.08%	0.14%	0.08%	0.14%
Expected dividend yield	2.10%	1.70%	2.10%	1.70%
Expected life	6 months 0 days	6 months 0 days	6 months 0 days	6 months 0 days
Expected volatility	19.00%	31.00%	19.00%	31.00%
Weighted average fair value	$ 6.02	$ 6.89	$ 6.02	$ 6.87

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Interim Consolidated Financial Statements - Revised Consolidated Statements of Income (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended						6 Months Ended		9 Months Ended	12 Months Ended		3 Months Ended						6 Months Ended		9 Months Ended	12 Months Ended		3 Months Ended						6 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 As Previously Reported [Member]	Mar. 31, 2013 As Previously Reported [Member]	Dec. 31, 2012 As Previously Reported [Member]	Sep. 30, 2012 As Previously Reported [Member]	Jun. 30, 2012 As Previously Reported [Member]	Mar. 31, 2012 As Previously Reported [Member]	Jun. 30, 2013 As Previously Reported [Member]	Jun. 30, 2012 As Previously Reported [Member]	Sep. 30, 2012 As Previously Reported [Member]	Dec. 31, 2012 As Previously Reported [Member]	Dec. 31, 2011 As Previously Reported [Member]	Jun. 30, 2013 Adjustments [Member]	Mar. 31, 2013 Adjustments [Member]	Dec. 31, 2012 Adjustments [Member]	Sep. 30, 2012 Adjustments [Member]	Jun. 30, 2012 Adjustments [Member]	Mar. 31, 2012 Adjustments [Member]	Jun. 30, 2013 Adjustments [Member]	Jun. 30, 2012 Adjustments [Member]	Sep. 30, 2012 Adjustments [Member]	Dec. 31, 2012 Adjustments [Member]	Dec. 31, 2011 Adjustments [Member]	Jun. 30, 2013 As Revised [Member]	Mar. 31, 2013 As Revised [Member]	Dec. 31, 2012 As Revised [Member]	Sep. 30, 2012 As Revised [Member]	Jun. 30, 2012 As Revised [Member]	Mar. 31, 2012 As Revised [Member]	Jun. 30, 2013 As Revised [Member]	Jun. 30, 2012 As Revised [Member]	Sep. 30, 2012 As Revised [Member]	Dec. 31, 2012 As Revised [Member]	Dec. 31, 2011 As Revised [Member]
Revenues:
Research services	$ 49,855	$ 50,509	$ 151,445	$ 151,145	$ 50,512	$ 50,378	$ 51,866	$ 50,300	$ 51,072	$ 49,760	$ 100,890	$ 100,832	$ 151,132	$ 202,998	$ 191,648	$ 800	$ (100)	$ 80	$ 209	$ (100)	$ (96)	$ 700	$ (196)	$ 13	$ 93	$ (153)	$ 51,312	$ 50,278	$ 51,946	$ 50,509	$ 50,972	$ 49,664	$ 101,590	$ 100,636	$ 151,145	$ 203,091	$ 191,495
Advisory services and other	19,960	18,264	68,684	66,725	27,652	21,121	23,200	18,211	28,021	20,500	48,773	48,521	66,732	89,932	91,968	(11)	(38)	15	53	(61)	1	(49)	(60)	(7)	8	(128)	27,641	21,083	23,215	18,264	27,960	20,501	48,724	48,461	66,725	89,940	91,840
Total revenues	69,815	68,773	220,129	217,870	78,164	71,499	75,066	68,511	79,093	70,260	149,663	149,353	217,864	292,930	283,616	789	(138)	95	262	(161)	(95)	651	(256)	6	101	(281)	78,953	71,361	75,161	68,773	78,932	70,165	150,314	149,097	217,870	293,031	283,335
Operating expenses:
General and administrative	(9,310)	(8,720)	(27,217)	(27,124)			10,199	8,411	8,645			18,256	26,667	36,866				(457)	309	148			148	457					9,742	8,720	8,793			18,404	27,124	36,866
Total operating expenses	65,514	61,643	202,760	195,055			67,673	61,334	67,632			133,264	194,598	262,271				(457)	309	148			148	457					67,216	61,643	67,780			133,412	195,055	262,271
Income from operations	4,301	7,130	17,369	22,815	8,999	3,418	7,393	7,177	11,461	4,628	12,417	16,089	23,266	30,659	36,997	789	(138)	552	(47)	(309)	(95)	651	(404)	(451)	101	(281)	9,788	3,280	7,945	7,130	11,152	4,533	13,068	15,685	22,815	30,760	36,716
Gains (losses) on investments, net	18	755	(84)	898	(51)	(51)	(739)	147	84	59	(102)	143	290	(449)	1,018	149	(149)	(65)	608					608	543	(1,417)	98	(200)	(804)	755	84	59	(102)	143	898	94	(399)
Income before income taxes	4,248	8,242	17,845	24,609	9,203	3,743	7,058	7,681	11,675	5,096	12,946	16,771	24,452	31,510	38,645	938	(287)	487	561	(309)	(95)	651	(404)	157	644	(1,698)	10,141	3,456	7,545	8,242	11,366	5,001	13,597	16,367	24,609	32,154	36,947
Income tax provision	1,813	(2,468)	7,056	3,191	3,581	1,402	2,807	(2,692)	3,906	1,915	4,983	5,821	3,129	5,936	15,635	375	(115)	195	224	(124)	(38)	260	(162)	62	257	(679)	3,956	1,287	3,002	(2,468)	3,782	1,877	5,243	5,659	3,191	6,193	14,956
Net income	$ 2,435	$ 10,710	$ 10,789	$ 21,418	$ 5,622	$ 2,341	$ 4,251	$ 10,373	$ 7,769	$ 3,181	$ 7,963	$ 10,950	$ 21,323	$ 25,574	$ 23,010	$ 563	$ (172)	$ 292	$ 337	$ (185)	$ (57)	$ 391	$ (242)	$ 95	$ 387	$ (1,019)	$ 6,185	$ 2,169	$ 4,543	$ 10,710	$ 7,584	$ 3,124	$ 8,354	$ 10,708	$ 21,418	$ 25,961	$ 21,991
Basic income per common share	$ 0.12	$ 0.48	$ 0.51	$ 0.95	$ 0.26	$ 0.10	$ 0.19	$ 0.46	$ 0.34	$ 0.14	$ 0.37	$ 0.48	$ 0.94	$ 1.14	$ 1.02	$ 0.03		$ 0.01	$ 0.02			$ 0.01	$ (0.01)	$ 0.01	$ 0.01	$ (0.05)	$ 0.29	$ 0.10	$ 0.20	$ 0.48	$ 0.34	$ 0.14	$ 0.38	$ 0.47	$ 0.95	$ 1.15	$ 0.97
Diluted income per common share	$ 0.12	$ 0.47	$ 0.50	$ 0.93	$ 0.26	$ 0.10	$ 0.19	$ 0.45	$ 0.34	$ 0.14	$ 0.36	$ 0.47	$ 0.93	$ 1.12	$ 0.99	$ 0.02		$ 0.01	$ 0.02	$ (0.01)	$ (0.01)	$ 0.02	$ (0.01)		$ 0.01	$ (0.04)	$ 0.28	$ 0.10	$ 0.20	$ 0.47	$ 0.33	$ 0.13	$ 0.38	$ 0.46	$ 0.93	$ 1.13	$ 0.95

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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Taxes (benefits) on unrealized gain	$ 143	$ 188	$ (98)	$ 354
Taxes on reclassification adjustment	$ 4	$ 2	$ (11)	$ 12

XML

Interim Consolidated Financial Statements

9 Months Ended

Sep. 30, 2013

Quarterly Financial Information Disclosure [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, 2012. 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, and cash flows as of the dates and for the periods presented have been included. The results of operations for the three and nine months ended September 30, 2013 may not be indicative of the results for the year ending December 31, 2013, 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 2 – Marketable Investments for the fair value of the Company’s marketable investments.

Revision of Prior Period Financial Statements

During the quarter ended September 30, 2013, the Company identified certain prior period errors that affected the interim and annual periods in the years ended December 31, 2012 and 2011, as well as the interim periods in the six months ended June 30, 2013. The Company has reflected in the financial information included in this Note the correction of all identified prior period errors in the periods in which they originated. The prior period errors relate to:

• An adjustment of $0.8 million for the three and six months ended June 30, 2013 to increase the amount of research services revenue related to recognition of revenue for the event ticket included in the Company’s RoleView and Forrester Leadership Board subscription products. Based on the identification of this error, the Company reassessed its historical calculations and identified a required change in its methodology for the accounting for an insignificant amount of contract modifications during this period that resulted in an increase (decrease) to revenue for each of the periods is as follows: ($0.1) million and $0.1 million for the three months ended March 31, 2012 and September 30, 2012, respectively, and $0.1 million for the year ended December 31, 2011. This error has been reflected in deferred revenue in the revised consolidated balance sheet and statement of cash flows presented below.

• Adjustments to the Company’s share of operating results in one of the technology-related investment funds in which the Company holds an interest, which adjustments are principally a result of information received by the Company from the fund after the applicable reporting periods. The Company records a portion of the fund’s operating results, based on the Company’s ownership interest in the fund, as investment gains (losses). The adjustments to the gains (losses) on investments for each period is as follows: ($0.1) million and $0.1 million for the three months ended March 31, 2013 and June 30, 2013, respectively; $0.6 million and ($0.1) million for the three months ended September 30, 2012 and December 31, 2012, respectively; and $0.5 million and ($1.4) million for the years ended December 31, 2012 and 2011, respectively. This error has been reflected in other assets in the revised consolidated balance sheet and in net (gains) losses from investments in the revised statement of cash flows presented below.

• Adjustments to revenue for historical insignificant variances in deferred revenue for reconciling items between the Company’s general ledger and sub-ledger system. The increase (decrease) to revenue for each of the periods is as follows: ($0.1) million for the three months ended March 31, 2013; ($0.2) million, $0.2 million and $0.1 million for the three months ended June 30, 2012, September 30, 2012 and December 31, 2012, respectively; and $0.1 million and ($0.4) million for the years ended December 31, 2012 and 2011, respectively. This error has been reflected in deferred revenue in the revised consolidated balance sheet and statement of cash flows presented below.

• Adjustments within the year ended December 31, 2012 for the improper capitalization of software development costs during the three months ended June 30, 2012 and September 30, 2012. These errors were corrected in the three months ended December 31, 2012 in the previously filed financial statements. The increase (decrease) in general and administrative expense for each of the periods is as follows: $0.2 million, $0.3 million and ($0.5) million for the three months ended June 30, 2012, September 30, 2012 and December 31, 2012, respectively. This error has been reflected in purchases of property and equipment in the revised consolidated statement of cash flows presented below.

In evaluating whether the Company’s previously issued consolidated financial statements were materially misstated, the Company considered the guidance in ASC Topic 250, Accounting Changes and Error Corrections, ASC Topic 250-10-S99-1, Assessing Materiality, and ASC Topic 250-10-S99-2, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements. The Company concluded that these errors were not material individually or in the aggregate to any of the prior reporting periods, and therefore, amendments of previously filed reports are not required. As such, the revisions for prior period corrections are reflected in the financial information for the applicable prior periods and will be reflected in future filings containing such prior period financial information.

The effects of these prior period errors on the consolidated financial statements are as follows (in thousands, except per share amounts):

Revised Consolidated Statements of Income

	Three Months Ended March 31, 2013									Three Months Ended June 30, 2013								Six Months Ended June 30, 2013
	As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Revenues:
Research services	$	50,378		$	(100	)	$	50,278		$	50,512		$	800		$	51,312	$	100,890		$	700		$	101,590
Advisory services and other		21,121			(38	)		21,083			27,652			(11	)		27,641		48,773			(49	)		48,724
Total revenues		71,499			(138	)		71,361			78,164			789			78,953		149,663			651			150,314
Income from operations		3,418			(138	)		3,280			8,999			789			9,788		12,417			651			13,068
Gains (losses) on investments, net		(51	)		(149	)		(200	)		(51	)		149			98		(102	)		—			(102	)
Income before income taxes		3,743			(287	)		3,456			9,203			938			10,141		12,946			651			13,597
Income tax provision		1,402			(115	)		1,287			3,581			375			3,956		4,983			260			5,243
Net income	$	2,341		$	(172	)	$	2,169		$	5,622		$	563		$	6,185	$	7,963		$	391		$	8,354
Basic income per common share	$	0.10		$	—		$	0.10		$	0.26		$	0.03		$	0.29	$	0.37		$	0.01		$	0.38
Diluted income per common share	$	0.10		$	—		$	0.10		$	0.26		$	0.02		$	0.28	$	0.36		$	0.02		$	0.38

	Nine Months Ended September 30, 2012							Three Months Ended December 31, 2012									Full Year Ended December 31, 2012
	As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments		As Revised
Revenues:
Research services	$	151,132	$	13		$	151,145	$	51,866		$	80		$	51,946		$	202,998		$	93	$	203,091
Advisory services and other		66,732		(7	)		66,725		23,200			15			23,215			89,932			8		89,940
Total revenues		217,864		6			217,870		75,066			95			75,161			292,930			101		293,031
Operating expenses:
General and administrative		26,667		457			27,124		10,199			(457	)		9,742			36,866			—		36,866
Total operating expenses		194,598		457			195,055		67,673			(457	)		67,216			262,271			—		262,271
Income from operations		23,266		(451	)		22,815		7,393			552			7,945			30,659			101		30,760
Gains (losses) on investments, net		290		608			898		(739	)		(65	)		(804	)		(449	)		543		94
Income before income taxes		24,452		157			24,609		7,058			487			7,545			31,510			644		32,154
Income tax provision		3,129		62			3,191		2,807			195			3,002			5,936			257		6,193
Net income	$	21,323	$	95		$	21,418	$	4,251		$	292		$	4,543		$	25,574		$	387	$	25,961
Basic income per common share	$	0.94	$	0.01		$	0.95	$	0.19		$	0.01		$	0.20		$	1.14		$	0.01	$	1.15
Diluted income per common share	$	0.93	$	—		$	0.93	$	0.19		$	0.01		$	0.20		$	1.12		$	0.01	$	1.13

	Three Months Ended June 30, 2012							Six Months Ended June 30, 2012							Three Months Ended September 30, 2012
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Revenues:
Research services	$	51,072	$	(100	)	$	50,972	$	100,832	$	(196	)	$	100,636	$	50,300		$	209		$	50,509
Advisory services and other		28,021		(61	)		27,960		48,521		(60	)		48,461		18,211			53			18,264
Total revenues		79,093		(161	)		78,932		149,353		(256	)		149,097		68,511			262			68,773
Operating expenses:
General and administrative		8,645		148			8,793		18,256		148			18,404		8,411			309			8,720
Total operating expenses		67,632		148			67,780		133,264		148			133,412		61,334			309			61,643
Income from operations		11,461		(309	)		11,152		16,089		(404	)		15,685		7,177			(47	)		7,130
Gains (losses) on investments, net		84		—			84		143		—			143		147			608			755
Income before income taxes		11,675		(309	)		11,366		16,771		(404	)		16,367		7,681			561			8,242
Income tax provision		3,906		(124	)		3,782		5,821		(162	)		5,659		(2,692	)		224			(2,468	)
Net income	$	7,769	$	(185	)	$	7,584	$	10,950	$	(242	)	$	10,708	$	10,373		$	337		$	10,710
Basic income per common share	$	0.34	$	—		$	0.34	$	0.48	$	(0.01	)	$	0.47	$	0.46		$	0.02		$	0.48
Diluted income per common share	$	0.34	$	(0.01	)	$	0.33	$	0.47	$	(0.01	)	$	0.46	$	0.45		$	0.02		$	0.47

	Three Months Ended March 31, 2012							Full Year Ended December 31, 2011
	As Previously Reported		Adjustments			As Revised		As Previously Reported		Adjustments			As Revised
Revenues:
Research services	$	49,760	$	(96	)	$	49,664	$	191,648	$	(153	)	$	191,495
Advisory services and other		20,500		1			20,501		91,968		(128	)		91,840
Total revenues		70,260		(95	)		70,165		283,616		(281	)		283,335
Income from operations		4,628		(95	)		4,533		36,997		(281	)		36,716
Gains (losses) on investments, net		59		—			59		1,018		(1,417	)		(399	)
Income before income taxes		5,096		(95	)		5,001		38,645		(1,698	)		36,947
Income tax provision		1,915		(38	)		1,877		15,635		(679	)		14,956
Net income	$	3,181	$	(57	)	$	3,124	$	23,010	$	(1,019	)	$	21,991
Basic income per common share	$	0.14	$	—		$	0.14	$	1.02	$	(0.05	)	$	0.97
Diluted income per common share	$	0.14	$	(0.01	)	$	0.13	$	0.99	$	(0.04	)	$	0.95

Revised Consolidated Statements of Comprehensive Income

The consolidated statements of comprehensive income for all periods is impacted by the same amount as net income for the respective period.

Revised Consolidated Balance Sheet

	As of December 31, 2012
	As Previously Reported		Adjustments			As Revised
Current Assets:
Prepaid expenses and other current assets	$	18,846	$	132		$	18,978
Total current assets		336,565		132			336,697
Other assets		9,123		(314	)		8,809
Total assets	$	487,832	$	(182	)	$	487,650
Current Liabilities:
Deferred revenue	$	150,479	$	16		$	150,495
Total current liabilities		181,329		16			181,345
Total liabilities		190,762		16			190,778
Retained earnings		117,648		(198	)		117,450
Total stockholders’ equity		297,070		(198	)		296,872
Total liabilities and stockholders’ equity	$	487,832	$	(182	)	$	487,650

Revised Consolidated Statements of Cash Flows

	Three Months Ended March 31, 2013							Six Months Ended June 30, 2013
	As Previously Reported		Adjustments			As Revised		As Previously Reported			Adjustments			As Revised
Cash flows from operating activities:
Net income	$	2,341	$	(172	)	$	2,169	$	7,963		$	391		$	8,354
Net (gains) losses from investments		51		149			200		102			—			102
Prepaid expenses and other current assets		1,271		(115	)		1,156		4,619			260			4,879
Deferred revenue		2,709		138			2,847		(12,955	)		(651	)		(13,606	)
Net cash provided by operating activities		35,453		—			35,453		37,231			—			37,231

	Nine Months Ended September 30, 2012									Year Ended December 31, 2012									Year Ended December 31, 2011
	As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised			As Previously Reported			Adjustments			As Revised
Cash flows from operating activities:
Net income	$	21,323		$	95		$	21,418		$	25,574		$	387		$	25,961		$	23,010		$	(1,019	)	$	21,991
Net (gains) losses from investments		(290	)		(608	)		(898	)		449			(543	)		(94	)		(1,018	)		1,417			399
Prepaid expenses and other current assets		3,929			62			3,991			6,279			257			6,536			(7,805	)		(679	)		(8,484	)
Deferred revenue		(23,302	)		(6	)		(23,308	)		1,807			(101	)		1,706			16,364			281			16,645
Net cash provided by operating activities		43,223			(457	)		42,766			53,147			—			53,147			55,444			—			55,444
Purchases of property and equipment		(4,845	)		457			(4,388	)		(5,103	)		—			(5,103	)		(39,776	)		—			(39,776	)
Net cash provided by (used in) investing activities		(15,989	)		457			(15,532	)		(4,076	)		—			(4,076	)		(53,036	)		—			(53,036	)

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Reorganization

9 Months Ended

Sep. 30, 2013

Restructuring And Related Activities [Abstract]

Reorganization

Note 4 — Reorganization

The following table rolls forward the activity in the reorganization accrual for the nine months ended September 30, 2013 (in thousands):

	Workforce
	Reduction
Accrual at December 31, 2012	$	14
Additions		1,905
Cash payments		(1,655	)
Accrual at September 30, 2013	$	264

During the nine months ended September 30, 2013 the Company incurred $1.9 million of severance and related costs for the elimination of 31 jobs or approximately 2.5% of its workforce worldwide to streamline its operations. The accrual at September 30, 2013 is expected to be paid by the end of 2013.

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Marketable Investments

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Marketable Investments

Note 2 — Marketable Investments

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value
September 30, 2013
Available-for-sale securities
State and municipal obligations	$	9,660	$	5	$	—		$	9,665
Federal agency and corporate obligations		77,330		131		(165	)		77,296
Total short-term available-for-sale securities		86,990		136		(165	)		86,961
ARS, long-term		11,000		—		(1,908	)		9,092
Total available-for-sale securities	$	97,990	$	136	$	(2,073	)	$	96,053

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value
December 31, 2012
Available-for-sale securities
State and municipal obligations	$	18,859	$	27	$	(14	)	$	18,872
Federal agency and corporate obligations		115,653		380		(29	)		116,004
Total short-term available-for-sale securities		134,512		407		(43	)		134,876
ARS, long-term		11,000		—		(2,030	)		8,970
Total available-for-sale securities	$	145,512	$	407	$	(2,073	)	$	143,846

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 federal agency, state, municipal and corporate obligations were not material in the three and nine months ended September 30, 2013 or 2012.

The following table summarizes the maturity periods of the marketable securities in the Company’s portfolio as of September 30, 2013. In February 2008, certain auction rate securities (“ARS”) that Forrester held experienced failed auctions that limited the liquidity of these securities. These auction failures have continued through September 30, 2013. On October 30, 2013 the Company sold the entire portfolio of ARS for net proceeds of $9.1 million. The following table reflects the ARS at their contractual maturity dates of between 2024 and 2034 (in thousands).

	FY 2013		FY2014		FY2015		Thereafter		Total
State and municipal obligations	$	2,772	$	4,821	$	2,072	$	—	$	9,665
Federal agency and corporate obligations		7,385		25,035		28,919		15,957		77,296
ARS		—		—		—		9,092		9,092
Total	$	10,157	$	29,856	$	30,991	$	25,049	$	96,053

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 September 30, 2013
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses
State and municipal bonds	$	—	$	—	$	—	$	—
Federal agency and corporate obligations		35,843		165		—		—
ARS		—		—		9,092		1,908
Total	$	35,843	$	165	$	9,092	$	1,908
	As of December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses
State and municipal bonds	$	9,430	$	14	$	—	$	—
Federal agency and corporate obligations		17,716		29		—		—
ARS		—		—		8,970		2,030
Total	$	27,146	$	43	$	8,970	$	2,030

Fair Value

The Company measures certain financial assets at fair value on a recurring basis, including cash equivalents, available-for-sale securities and trading 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 September 30, 2013 and December 31, 2012 (in thousands):

	As of September 30, 2013
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	7,111	$	—	$	—	$	7,111
State and municipal obligations		—		9,665		—		9,665
Federal agency and corporate obligations		—		77,296		—		77,296
ARS		—		—		9,092		9,092
Total	$	7,111	$	86,961	$	9,092	$	103,164
	As of December 31, 2012
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	815	$	—	$	—	$	815
State and municipal obligations		—		18,872		—		18,872
Federal agency and corporate obligations (2)		—		148,117		—		148,117
ARS		—		—		8,970		8,970
Total	$	815	$	166,989	$	8,970	$	176,774

(1) Included in cash and cash equivalents.

(2) $32.1 million are included in cash and cash equivalents at December 31, 2012 as original maturities at the time of purchase were 90 days or less.

Level 2 assets consist of the Company’s entire portfolio of federal, state, municipal and corporate bonds, excluding those municipal bonds described below with an auction reset feature. 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.

Level 3 assets at September 30, 2013 and December 31, 2012 consist entirely of municipal bonds with an auction reset feature (ARS). Prior to 2008, the fair value of the ARS investments approximated par value due to the frequent resets through the auction process. While the Company continues to receive interest income on its ARS investments at each interest reset date (which occurs at either seven or 35 day intervals for each security), these investments trade infrequently and therefore do not have a readily determinable market value. Interest rates on the securities ranged from 0.1% to 0.4% and 0.1% to 0.5% during the nine months ended September 30, 2013 and 2012, respectively. The Company values the ARS using a discounted cash flow model that includes unobservable inputs including estimates of future interest rates, discount rates and expected holding periods of the securities, which is considered a Level 3 valuation. Unobservable inputs included in the valuation as of September 30, 2013 include a weighted average interest rate of 1.7%, a weighted average discount rate of 4.9%, and a weighted average holding period of 8.7 years. The valuation resulted in an unrealized loss recorded in accumulated other comprehensive income in the Consolidated Balance Sheets of $1.9 million at September 30, 2013 and $2.0 million at December 31, 2012. As of September 30, 2013, the Company classified the loss as temporary due to the strong underlying credit rating of the securities and the fact that the Company, as of September 30, 2013, did not intend to sell the securities and was not likely to be required to sell the securities. The assumptions used in valuing the ARS are volatile and subject to change as the underlying sources of these assumptions and market conditions change. Significant increases or decreases in any of the valuation assumptions in isolation would result in a significant change in the fair value.

On October 22, 2013 the Company made the decision to sell its entire portfolio of ARS. On October 30, 2013 the Company completed the sale of the ARS for net proceeds of $9.1 million, resulting in a realized loss of $1.9 million that will be recognized as an investment loss in the consolidated statement of income for the three months ended December 31, 2013.

The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets for the nine months ended September 30, 2013 and 2012 (in thousands):

	ARS
Balance at December 31, 2011	$	9,565
Sales		—
Gains included in other comprehensive income		224
Balance at September 30, 2012	$	9,789
	ARS
Balance at December 31, 2012	$	8,970
Sales		—
Gains included in other comprehensive income		122
Balance at September 30, 2013	$	9,092

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Stockholders' Equity - Summary of Stock-Based Compensation Recorded in Expense Categories (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	$ 1,860	$ 1,409	$ 4,588	$ 3,921
Cost of Services and Fulfillment [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	1,061	835	2,708	2,213
Selling and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	321	207	893	638
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	$ 478	$ 367	$ 987	$ 1,070

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Marketable Investments - Summary of Company's Marketable Investments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 97,990	$ 145,512
Gross Unrealized Gains	136	407
Gross Unrealized Losses	(2,073)	(2,073)
Total short and long term	96,053	143,846
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,660	18,859
Gross Unrealized Gains	5	27
Gross Unrealized Losses		(14)
Total short and long term	9,665	18,872
Federal Agency and Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77,330	115,653
Gross Unrealized Gains	131	380
Gross Unrealized Losses	(165)	(29)
Total short and long term	77,296	116,004
Total Short-Term Available-for-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	86,990	134,512
Gross Unrealized Gains	136	407
Gross Unrealized Losses	(165)	(43)
Total short and long term	86,961	134,876
ARS [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,000	11,000
Gross Unrealized Gains
Gross Unrealized Losses	(1,908)	(2,030)
Total short and long term	$ 9,092	$ 8,970

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Marketable Investments - Summary of Company's Fair Value Hierarchy for its Financial Assets (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012 Federal Agency and Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		$ 32.1
Original maturities	90 days

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Reorganization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 Job
Restructuring And Related Activities [Abstract]
Severance and related costs	$ 1.9
Number of jobs eliminated worldwide	31
Number of jobs eliminated worldwide, percentage	2.50%

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Operating Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013 Segment
Segment Reporting [Abstract]
Number of Operating Segments	2

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	500	500
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	125,000	125,000
Common stock, shares issued	20,389	31,451
Common stock, shares outstanding	19,896	22,293
Treasury stock, shares	493	9,158

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Income Taxes

9 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

Note 7 — 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 for the nine months ended September 30, 2013 was $7.1 million resulting in an effective tax rate of 39.5% for the period. Income tax expense for the nine months ended September 30, 2012 was $3.2 million resulting in an effective tax rate of 13.0% for the period. The increase in the effective tax rate during the nine months ended September 30, 2013 as compared to the prior year is primarily due to the 2012 period including a $5.5 million deferred tax benefit resulting from the settlement of a tax audit at one of the Company’s foreign subsidiaries. In addition, the 2012 period included a reduction in the reserve for uncertain tax positions as well as a credit due to a remeasurement gain of a euro-denominated deferred tax liability.

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 2,435	$ 10,710	$ 10,789	$ 21,418
Other comprehensive income, net of taxes:
Cumulative translation adjustments	1,560	7,197	221	6,865
Changes in market value of investments:
Unrealized gain (loss), net of taxes (benefits) of $143 and $188 for the three months ended September 30, 2013 and 2012, and $(98) and $354 for the nine months ended September 30, 2013 and 2012	238	291	(202)	624
Less: reclassification adjustment for net (gains) losses realized in net income, net of taxes of $4 and $2 for the three months ended September 30, 2013 and 2012, and $(11) and $12 for the nine months ended September 30, 2013 and 2012	(7)	(3)	17	(17)
Net change in market value of investments	231	288	(185)	607
Other comprehensive income	1,791	7,485	36	7,472
Comprehensive income	$ 4,226	$ 18,195	$ 10,825	$ 28,890

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 70,700	$ 98,810
Marketable investments (Note 2)	86,961	134,876
Accounts receivable, net	37,009	74,623
Deferred commissions	8,408	9,410
Prepaid expenses and other current assets	18,645	18,978
Total current assets	221,723	336,697
Long-term marketable investments (Note 2)	9,092	8,970
Property and equipment, net	41,058	46,300
Goodwill	79,493	78,954
Intangible assets, net	6,296	7,920
Other assets	11,166	8,809
Total assets	368,828	487,650
Current Liabilities:
Accounts payable	918	772
Accrued expenses and other current liabilities	25,184	30,078
Deferred revenue	125,787	150,495
Total current liabilities	151,889	181,345
Non-current liabilities	8,972	9,433
Total liabilities	160,861	190,778
Commitments
Stockholders' Equity (Note 6):
Preferred stock, $.01 par value Authorized - 500 shares, issued and outstanding - none
Common stock, $.01 par value Authorized - 125,000 shares Issued - 20,389 and 31,451 as of September 30, 2013 and December 31, 2012, respectively Outstanding - 19,896 and 22,293 as of September 30, 2013 and December 31, 2012, respectively	204	315
Additional paid-in capital	105,396	389,362
Retained earnings	118,814	117,450
Treasury stock - 493 and 9,158 as of September 30, 2013 and December 31, 2012, respectively, at cost	(17,071)	(210,843)
Accumulated other comprehensive income	624	588
Total stockholders' equity	207,967	296,872
Total liabilities and stockholders' equity	$ 368,828	$ 487,650

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Marketable Investments - Summary of Maturity Periods of the Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
FY 2013, Total	$ 10,157
FY 2014, Total	29,856
FY 2015, Total	30,991
Thereafter, Total	25,049
Total short and long term	96,053	143,846
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
FY 2013, Total	2,772
FY 2014, Total	4,821
FY 2015, Total	2,072
Thereafter, Total
Total short and long term	9,665	18,872
Federal Agency and Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
FY 2013, Total	7,385
FY 2014, Total	25,035
FY 2015, Total	28,919
Thereafter, Total	15,957
Total short and long term	77,296	116,004
ARS [Member]
Schedule of Available-for-sale Securities [Line Items]
FY 2013, Total
FY 2014, Total
FY 2015, Total
Thereafter, Total	9,092
Total short and long term	$ 9,092	$ 8,970

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Operating Segments (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Summary of Information about Reportable Segments

The following tables present information about reportable segments (in thousands):

	BT		M&S		Events			Consolidated
Three Months Ended September 30, 2013
Revenue	$	37,659	$	31,809	$	347		$	69,815
Direct margin		24,912		20,923		(656	)		45,179
Selling, marketing, administrative and other expenses									(40,321	)
Amortization of intangible assets									(557	)
Reorganization costs									—
Other income (expense) and gains (losses) on investments									(53	)
Income before income taxes								$	4,248
	BT		M&S		Events			Consolidated
Three Months Ended September 30, 2012
Revenue	$	37,764	$	30,707	$	302		$	68,773
Direct margin		25,966		20,203		(727	)		45,442
Selling, marketing, administrative and other expenses									(37,696	)
Amortization of intangible assets									(579	)
Reorganization costs									(37	)
Other income (expense) and gains (losses) on investments									1,112
Income before income taxes								$	8,242
	BT		M&S		Events			Consolidated
Nine Months Ended September 30, 2013
Revenue	$	115,327	$	95,690	$	9,112		$	220,129
Direct margin		78,100		62,909		3,204			144,213
Selling, marketing, administrative and other expenses									(123,269	)
Amortization of intangible assets									(1,670	)
Reorganization costs									(1,905	)
Other income (expense) and gains (losses) on investments									476
Income before income taxes								$	17,845
	BT		M&S		Events			Consolidated
Nine Months Ended September 30, 2012
Revenue	$	115,470	$	92,995	$	9,405		$	217,870
Direct margin		78,882		60,823		3,241			142,946
Selling, marketing, administrative and other expenses									(116,921	)
Amortization of intangible assets									(1,779	)
Reorganization costs									(1,431	)
Other income (expense) and gains (losses) on investments									1,794
Income before income taxes								$	24,609

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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,813,000	$ (2,468,000)	$ 7,056,000	$ 3,191,000
Effective tax rate			39.50%	13.00%
Increase in the effective tax			$ 5,500,000

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Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding at December 31, 2012	1,936
Number of Shares, Granted	489
Number of Shares, Exercised	(524)
Number of Shares, Forfeited	(69)
Number of Shares, Outstanding at September 30 2013	1,832
Number of Shares, Exercisable at September 30 2013	866
Weighted Average Exercise Price Per Share, Outstanding, Beginning balance	$ 29.03
Weighted Average Exercise Price Per Share, Granted	$ 35.20
Weighted Average Exercise Price Per Share, Exercised	$ 25.46
Weighted Average Exercise Price Per Share, Forfeited	$ 32.05
Weighted Average Exercise Price Per Share, Outstanding, Ending balance	$ 31.58
Weighted Average Exercise Price Per Share, Exercisable at September 30, 2013	$ 28.73
Weighted Average Remaining Contractual Term, Outstanding at September 30, 2013	7 years 1 month 10 days
Weighted Average Remaining Contractual Term, Exercisable at September 30, 2013	5 years 1 month 21 days
Aggregate Intrinsic Value, Outstanding at September 30, 2013	$ 9,592
Aggregate Intrinsic Value, Exercisable at September 30, 2013	$ 6,995

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Non-Marketable Investments - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Technology Related Private Equity Funds [Member]	Dec. 31, 2012 Technology Related Private Equity Funds [Member]	Sep. 30, 2012 Non-marketable Investments [Member]	Sep. 30, 2013 Non-marketable Investments [Member]	Sep. 30, 2012 Non-marketable Investments [Member]	Sep. 30, 2013 Maximum [Member] Participant	Sep. 30, 2013 Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying value of the Company's non-marketable investments				$ 6,200,000	$ 6,600,000
Ownership interest of company										5.00%
Gain (losses) from non-marketable investments	0					800,000	(100,000)	900,000
Book value of investment	900,000	900,000	1,200,000
Bonus paid under cash bonus plan		$ 0
Cash bonus plan expiration date		Jun. 30, 2015
Participant in the cash bonus plan									10

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Reorganization - Summary of Roll Forward of Activity in Reorganization Accrual (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Additions		$ 37	$ 1,905	$ 1,431
Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Accrual Beginning Balance			14
Additions			1,905
Cash payments			(1,655)
Accrual Ending Balance	$ 264		$ 264

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Stockholders' Equity

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Stockholders' Equity

Note 6 — Stockholders’ Equity

Equity Plans

Stock option activity for the nine months ended September 30, 2013 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, 2012		1,936		$	29.03
Granted		489			35.20
Exercised		(524	)		25.46
Forfeited		(69	)		32.05
Outstanding at September 30, 2013		1,832		$	31.58		7.11	$	9,592
Exercisable at September 30, 2013		866		$	28.73		5.14	$	6,995

Restricted stock unit activity for the nine months ended September 30, 2013 is presented below (in thousands, except per share data):

	Number of Shares			Weighted- Average Grant Date Fair Value
Unvested at December 31, 2012		301		$	32.98
Granted		207			34.58
Vested or settled		(67	)		32.91
Forfeited		(56	)		31.02
Unvested at September 30, 2013		385		$	34.14

Stock-Based Compensation

Forrester recognizes the fair value of stock-based compensation in net income 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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of services and fulfillment	$	1,061	$	835	$	2,708	$	2,213
Selling and marketing		321		207		893		638
General and administrative		478		367		987		1,070
Total	$	1,860	$	1,409	$	4,588	$	3,921

In 2010, the Company issued to its employees approximately 63,000 performance-based RSUs. The vesting of the RSUs was subject to performance criteria and would vest at 100% or 40% on April 1, 2013, or the RSUs could be forfeited, depending on whether specified revenue growth and certain operating margin targets related to full year 2012 performance were achieved. Based on 2012 financial performance these RSUs were forfeited. Compensation expense through the third quarter of 2011 was recognized based on an estimate of 100% vesting of the RSUs and in the fourth quarter of 2011 the Company modified its assessment of vesting to a zero percent level. The Company continued to utilize a zero percent vesting estimate through March 31, 2013.

In 2011, the Company issued to its employees approximately 71,000 performance-based RSUs. The vesting of the RSUs is subject to performance criteria and will vest at 100% or 40% on April 1, 2014, or the RSUs could be forfeited, depending on whether specified revenue growth and certain operating margin targets related to full year 2013 performance are achieved. Compensation expense through the third quarter of 2011 was recognized based on an estimate of 100% vesting of the RSUs and in the fourth quarter of 2011 the Company modified its assessment of vesting to a zero percent level. The Company continued to utilize a zero percent vesting estimate through the nine months ended September 30, 2013.

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 September 30, 2013						Three Months Ended September 30, 2012
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		1.40	%		0.08	%		0.62	%		0.14	%
Expected dividend yield		2.1	%		2.1	%		1.7	%		1.7	%
Expected life		4.9 Years			0.5 Years			4.5 Years			0.5 Years
Expected volatility		36	%		19	%		40	%		31	%
Weighted average fair value	$	9.94		$	6.02		$	9.42		$	6.89
	Nine Months Ended September 30, 2013						Nine Months Ended September 30, 2012
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		0.81	%		0.08	%		0.87	%		0.14	%
Expected dividend yield		2.1	%		2.1	%		1.7	%		1.7	%
Expected life		4.9 Years			0.5 Years			4.5 Years			0.5 Years
Expected volatility		37	%		19	%		40	%		31	%
Weighted average fair value	$	9.15		$	6.02		$	9.81		$	6.87

Dividends

In the nine months ended September 30, 2013, the Company declared and paid dividends of $9.4 million consisting of a $0.15 per share dividend in each of the first three quarters of 2013. In the nine months ended September 30, 2012, the Company declared and paid dividends of $9.5 million consisting of a $0.14 per share dividend in each of the first three quarters of 2012. In October 2013, the Company declared a dividend of $0.15 per share payable on December 18, 2013 to shareholders of record as of December 4, 2013.

Treasury Stock

Forrester’s Board of Directors has authorized an aggregate $385.0 million, including $25 million authorized in July 2013 and $50 million authorized in February 2013, to purchase common stock under the stock repurchase program. The shares repurchased may be used, among other things, in connection with Forrester’s employee and director equity incentive and purchase plans. In the nine months ended September 30, 2013, the Company repurchased approximately 3.0 million shares of common stock at an aggregate cost of approximately $109.2 million, inclusive of the repurchase of shares pursuant to the “modified Dutch auction” described below. From the inception of the program through September 30, 2013, Forrester repurchased approximately 12.2 million shares of common stock at an aggregate cost of approximately $320.0 million.

On April 3, 2013 the Company commenced a “modified Dutch auction” self-tender offer to repurchase up to $130 million of its common stock at a price per share within the range of $32.00 to $36.00. A “modified Dutch auction” self-tender offer allows stockholders to indicate how many shares and at what price within the company’s specified range (in increments of $0.25 per share) they wish to tender. When the tender offer expired, based upon the number of shares tendered and the prices specified by the tendering stockholders, the Company determined the purchase price, which was the lowest price per share within the range that enabled the Company to purchase up to $130 million of its common stock. The tender offer expired on May 1, 2013 and the Company purchased 2,054,732 shares of its common stock on May 7, 2013 at a purchase price of $36.00 per share for an aggregate purchase price of $74.0 million, plus approximately $1.1 million of expenses related to the tender offer.

In the nine months ended September 30, 2013, the Company retired 11.7 million shares of treasury stock. These retired shares are now included in the Company’s pool of authorized but unissued shares. The retired stock had a carrying value of approximately $303.0 million. The Company’s accounting policy upon the formal retirement of treasury stock is to deduct the par value of the retired stock from Common Stock and to reflect the excess of cost over par value as a deduction from Additional Paid-in Capital.

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Marketable Investments - Summary of Gross Unrealized Losses and Market Value of Available-for-Sale Securities with Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Less Than 12 Months, Market Value	$ 35,843	$ 27,146
Available for sale securities, Less Than 12 Months, Unrealized Losses	165	43
Available for sale securities, 12 Months or Greater, Market Value	9,092	8,970
Available for sale securities, 12 Months or Greater, Unrealized Losses	1,908	2,030
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Less Than 12 Months, Market Value		9,430
Available for sale securities, Less Than 12 Months, Unrealized Losses		14
Available for sale securities, 12 Months or Greater, Market Value
Available for sale securities, 12 Months or Greater, Unrealized Losses
Federal Agency and Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Less Than 12 Months, Market Value	35,843	17,716
Available for sale securities, Less Than 12 Months, Unrealized Losses	165	29
Available for sale securities, 12 Months or Greater, Market Value
Available for sale securities, 12 Months or Greater, Unrealized Losses
ARS [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Less Than 12 Months, Market Value
Available for sale securities, Less Than 12 Months, Unrealized Losses
Available for sale securities, 12 Months or Greater, Market Value	9,092	8,970
Available for sale securities, 12 Months or Greater, Unrealized Losses	$ 1,908	$ 2,030

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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			3 Months Ended						9 Months Ended			1 Months Ended			9 Months Ended	12 Months Ended
	Jul. 31, 2013	Apr. 30, 2013	Feb. 28, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Apr. 30, 2013 Minimum [Member]	Apr. 30, 2013 Maximum [Member]	Oct. 31, 2013 Subsequent Event [Member]	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2010 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's issued				385,000						385,000		301,000					71,000	63,000
Performance of RSU's Vesting																	100% or 40% on April 1, 2014	100% or 40% on April 1, 2013
Compensation expense Estimate vesting																	100.00%	100.00%
Modified Estimate vesting of RSU's																0.00%		0.00%
Dividend declared and paid per share				$ 0.15	$ 0.15	$ 0.15	$ 0.14	$ 0.14	$ 0.14
Aggregate dividend declared for the year										$ 9.4	$ 9.5
Dividend declared				$ 0.15			$ 0.14			$ 0.45	$ 0.42				$ 0.15
Aggregate cost of repurchase of common stock										320.0
Authorized to Purchase of common stock under the stock repurchase program	25.0		50.0							385.0
Cumulative repurchase of common stock				12,200,000						12,200,000
Repurchase of common Stock										3,000,000
Cumulative aggregate cost of repurchase of common stock										109.2
Repurchase of self-tender		130
Common stock price per share													$ 32.00	$ 36.00
Increment in per share value		$ 0.25
Purchase of common stock		2,054,732
Purchase price of common stock		$ 36.00
Aggregate price of stock		74.0
Expenses related to tender offer		1.1
Treasury stock, retired										11,700,000
Carrying value of retired stock										$ 303.0

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Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2013

Accounting Changes And Error Corrections [Abstract]

Recent Accounting Pronouncements

Note 9 — Recent Accounting Pronouncements

In July 2012, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2012-02, Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment. This accounting standard allows an entity the option to first assess qualitative factors to determine whether it is necessary to perform a quantitative impairment test for indefinite-lived intangibles other than goodwill. Under that option, an entity would no longer be required to calculate the fair value of an indefinite-lived intangible asset unless the entity determines, based on that qualitative assessment, that it is more likely than not that the fair value of the indefinite-lived intangible asset is less than its carrying amount. This ASU was effective for annual and interim indefinite-lived intangible asset impairment tests performed for fiscal years beginning after September 15, 2012. As the Company does not have any indefinite-lived intangible assets as of September 30, 2013 other than goodwill, the adoption of this standard on January 1, 2013 did not have an impact on the Company’s consolidated financial results.

In February 2013, the FASB issued ASU No. 2013-02, Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income. This accounting standard requires companies to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, companies are required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. This ASU is effective for reporting periods beginning after December 15, 2012. Other than requiring additional disclosures, adoption of this ASU did not have a significant impact on the Company’s consolidated financial results.

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Net Income Per Common Share

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Net Income Per Common Share

Note 5 — Net Income Per Common Share

Basic net income per common share is computed by dividing net income by the basic weighted average number of common shares outstanding during the period. Diluted net income per common share is computed by dividing net income 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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Basic weighted average common shares outstanding		20,117		22,398		21,226		22,573
Weighted average common equivalent shares		548		460		464		445
Diluted weighted average common shares outstanding		20,665		22,858		21,690		23,018
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive		608		967		700		644

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 10,789	$ 21,418
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,954	6,510
Amortization of intangible assets	1,670	1,779
Net (gains) losses from investments	84	(898)
Deferred income taxes	(6,461)	(9,851)
Stock-based compensation	4,588	3,921
Amortization of premium on investments	1,809	2,144
Foreign currency losses	248	382
Changes in assets and liabilities, net of acquisitions
Accounts receivable	37,570	37,196
Deferred commissions	1,002	4,127
Prepaid expenses and other current assets	3,683	3,991
Accounts payable	116	(318)
Accrued expenses and other liabilities	(4,698)	(4,327)
Deferred revenue	(25,002)	(23,308)
Net cash provided by operating activities	32,352	42,766
Cash flows from investing activities:
Purchases of property and equipment	(2,049)	(4,388)
Purchases of marketable investments	(39,636)	(85,211)
Proceeds from sales and maturities of marketable investments	85,398	73,055
Change in restricted cash		946
Other investing activity	134	66
Net cash provided by (used in) investing activities	43,847	(15,532)
Cash flows from financing activities:
Dividends paid on common stock	(9,425)	(9,481)
Repurchases of common stock	(109,193)	(26,187)
Proceeds from issuance of common stock under employee equity incentive plans	14,506	8,538
Excess tax benefits from stock-based compensation	687	401
Payment of deferred acquisition consideration	(900)	(864)
Net cash used in financing activities	(104,325)	(27,593)
Effect of exchange rate changes on cash and cash equivalents	16	212
Net decrease in cash and cash equivalents	(28,110)	(147)
Cash and cash equivalents, beginning of period	98,810	81,047
Cash and cash equivalents, end of period	$ 70,700	$ 80,900

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Recent Accounting Pronouncements - Additional Information (Detail) (USD $)	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Indefinite-lived intangible assets	$ 0

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Marketable Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			1 Months Ended	9 Months Ended
	Sep. 30, 2013 Accumulated Net Unrealized Investment Gain (Loss) [Member]	Dec. 31, 2012 Accumulated Net Unrealized Investment Gain (Loss) [Member]	Oct. 30, 2013 ARS [Member] Subsequent Event [Member]	Sep. 30, 2013 ARS [Member] Level 3 [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2012 Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intervals for each security					7 days		35 days
Interest rates on securities ranged					0.10%	0.10%	0.40%	0.50%
Weighted average interest rate				1.70%
Weighted average discount rate				4.90%
Weighted average holding period				8 years 8 months 12 days
Unrealized loss recorded in accumulated other comprehensive income	$ 1.9	$ 2.0
Proceeds from sale of ARS			9.1
Loss realized on ARS			$ 1.9

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Marketable Investments (Tables)

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Summary of Company's Marketable Investments

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value
September 30, 2013
Available-for-sale securities
State and municipal obligations	$	9,660	$	5	$	—		$	9,665
Federal agency and corporate obligations		77,330		131		(165	)		77,296
Total short-term available-for-sale securities		86,990		136		(165	)		86,961
ARS, long-term		11,000		—		(1,908	)		9,092
Total available-for-sale securities	$	97,990	$	136	$	(2,073	)	$	96,053

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Market Value
December 31, 2012
Available-for-sale securities
State and municipal obligations	$	18,859	$	27	$	(14	)	$	18,872
Federal agency and corporate obligations		115,653		380		(29	)		116,004
Total short-term available-for-sale securities		134,512		407		(43	)		134,876
ARS, long-term		11,000		—		(2,030	)		8,970
Total available-for-sale securities	$	145,512	$	407	$	(2,073	)	$	143,846

Summary of Maturity Periods of the Marketable Securities

The following table reflects the ARS at their contractual maturity dates of between 2024 and 2034 (in thousands).

	FY 2013		FY2014		FY2015		Thereafter		Total
State and municipal obligations	$	2,772	$	4,821	$	2,072	$	—	$	9,665
Federal agency and corporate obligations		7,385		25,035		28,919		15,957		77,296
ARS		—		—		—		9,092		9,092
Total	$	10,157	$	29,856	$	30,991	$	25,049	$	96,053

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

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 September 30, 2013
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses
State and municipal bonds	$	—	$	—	$	—	$	—
Federal agency and corporate obligations		35,843		165		—		—
ARS		—		—		9,092		1,908
Total	$	35,843	$	165	$	9,092	$	1,908
	As of December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Market Value		Unrealized Losses		Market Value		Unrealized Losses
State and municipal bonds	$	9,430	$	14	$	—	$	—
Federal agency and corporate obligations		17,716		29		—		—
ARS		—		—		8,970		2,030
Total	$	27,146	$	43	$	8,970	$	2,030

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

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 September 30, 2013 and December 31, 2012 (in thousands):

	As of September 30, 2013
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	7,111	$	—	$	—	$	7,111
State and municipal obligations		—		9,665		—		9,665
Federal agency and corporate obligations		—		77,296		—		77,296
ARS		—		—		9,092		9,092
Total	$	7,111	$	86,961	$	9,092	$	103,164
	As of December 31, 2012
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	815	$	—	$	—	$	815
State and municipal obligations		—		18,872		—		18,872
Federal agency and corporate obligations (2)		—		148,117		—		148,117
ARS		—		—		8,970		8,970
Total	$	815	$	166,989	$	8,970	$	176,774

(1) Included in cash and cash equivalents.

(2) $32.1 million are included in cash and cash equivalents at December 31, 2012 as original maturities at the time of purchase were 90 days or less.

Summary of Changes in Fair Value of Level 3 Financial Assets

The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets for the nine months ended September 30, 2013 and 2012 (in thousands):

	ARS
Balance at December 31, 2011	$	9,565
Sales		—
Gains included in other comprehensive income		224
Balance at September 30, 2012	$	9,789
	ARS
Balance at December 31, 2012	$	8,970
Sales		—
Gains included in other comprehensive income		122
Balance at September 30, 2013	$	9,092

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Operating Segments

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Operating Segments

Note 8 — Operating Segments

Forrester is organized into two client groups with each client group responsible for writing relevant research for the roles within the client organization on a worldwide basis. The two client groups, which are considered operating segments, are: Business Technology (“BT”) and Marketing and Strategy (“M&S”). In addition, the Company’s Events segment supports both client groups. Each client group generates revenues through sales of research, advisory and other service offerings targeted at specific roles within their targeted clients. Each client group consists of research personnel focused primarily on issues relevant to particular roles and to the day-to-day responsibilities of persons within the roles. Amounts included in the Events segment relate to the operations of the events production department. Revenue reported in the Events segment consists primarily of sponsorships and event tickets to Forrester events.

Forrester evaluates reportable segment performance and allocates resources based on direct margin. Direct margin, as presented below, is defined as operating income excluding sales expenses, certain marketing and fulfillment expenses, stock-based compensation expense, general and administrative expenses, depreciation expense, amortization of intangible assets and reorganization costs. In the first quarter of 2013, the Company modified segment direct margin for each of the BT and M&S client groups to reflect the transfer of revenue and direct costs related to one product line from BT to M&S and to reallocate certain shared consulting costs between BT & M&S. Accordingly, the 2012 amounts have been reclassified to conform to the current presentation. The accounting policies used by the segments are the same as those used in the consolidated financial statements.

The following tables present information about reportable segments (in thousands):

	BT		M&S		Events			Consolidated
Three Months Ended September 30, 2013
Revenue	$	37,659	$	31,809	$	347		$	69,815
Direct margin		24,912		20,923		(656	)		45,179
Selling, marketing, administrative and other expenses									(40,321	)
Amortization of intangible assets									(557	)
Reorganization costs									—
Other income (expense) and gains (losses) on investments									(53	)
Income before income taxes								$	4,248
	BT		M&S		Events			Consolidated
Three Months Ended September 30, 2012
Revenue	$	37,764	$	30,707	$	302		$	68,773
Direct margin		25,966		20,203		(727	)		45,442
Selling, marketing, administrative and other expenses									(37,696	)
Amortization of intangible assets									(579	)
Reorganization costs									(37	)
Other income (expense) and gains (losses) on investments									1,112
Income before income taxes								$	8,242
	BT		M&S		Events			Consolidated
Nine Months Ended September 30, 2013
Revenue	$	115,327	$	95,690	$	9,112		$	220,129
Direct margin		78,100		62,909		3,204			144,213
Selling, marketing, administrative and other expenses									(123,269	)
Amortization of intangible assets									(1,670	)
Reorganization costs									(1,905	)
Other income (expense) and gains (losses) on investments									476
Income before income taxes								$	17,845
	BT		M&S		Events			Consolidated
Nine Months Ended September 30, 2012
Revenue	$	115,470	$	92,995	$	9,405		$	217,870
Direct margin		78,882		60,823		3,241			142,946
Selling, marketing, administrative and other expenses									(116,921	)
Amortization of intangible assets									(1,779	)
Reorganization costs									(1,431	)
Other income (expense) and gains (losses) on investments									1,794
Income before income taxes								$	24,609

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Summary of Stock Option Activity

Stock option activity for the nine months ended September 30, 2013 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, 2012		1,936		$	29.03
Granted		489			35.20
Exercised		(524	)		25.46
Forfeited		(69	)		32.05
Outstanding at September 30, 2013		1,832		$	31.58		7.11	$	9,592
Exercisable at September 30, 2013		866		$	28.73		5.14	$	6,995

Details of Restricted Stock Unit Activity

Restricted stock unit activity for the nine months ended September 30, 2013 is presented below (in thousands, except per share data):

	Number of Shares			Weighted- Average Grant Date Fair Value
Unvested at December 31, 2012		301		$	32.98
Granted		207			34.58
Vested or settled		(67	)		32.91
Forfeited		(56	)		31.02
Unvested at September 30, 2013		385		$	34.14

Summary of Stock-Based Compensation Recorded in Expense Categories

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Cost of services and fulfillment	$	1,061	$	835	$	2,708	$	2,213
Selling and marketing		321		207		893		638
General and administrative		478		367		987		1,070
Total	$	1,860	$	1,409	$	4,588	$	3,921

Assumptions for Valuation of Options Granted under Equity Incentive Plans and Shares Subject to Purchase under Employee Stock Purchase Plan

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 September 30, 2013						Three Months Ended September 30, 2012
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		1.40	%		0.08	%		0.62	%		0.14	%
Expected dividend yield		2.1	%		2.1	%		1.7	%		1.7	%
Expected life		4.9 Years			0.5 Years			4.5 Years			0.5 Years
Expected volatility		36	%		19	%		40	%		31	%
Weighted average fair value	$	9.94		$	6.02		$	9.42		$	6.89
	Nine Months Ended September 30, 2013						Nine Months Ended September 30, 2012
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		0.81	%		0.08	%		0.87	%		0.14	%
Expected dividend yield		2.1	%		2.1	%		1.7	%		1.7	%
Expected life		4.9 Years			0.5 Years			4.5 Years			0.5 Years
Expected volatility		37	%		19	%		40	%		31	%
Weighted average fair value	$	9.15		$	6.02		$	9.81		$	6.87

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Reorganization (Tables)

9 Months Ended

Sep. 30, 2013

Restructuring And Related Activities [Abstract]

Summary of Roll Forward of Activity in Reorganization Accrual

The following table rolls forward the activity in the reorganization accrual for the nine months ended September 30, 2013 (in thousands):

	Workforce
	Reduction
Accrual at December 31, 2012	$	14
Additions		1,905
Cash payments		(1,655	)
Accrual at September 30, 2013	$	264

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Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 07, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
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		19,753,000

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Net Income Per Common Share (Tables)

9 Months Ended

Sep. 30, 2013

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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Basic weighted average common shares outstanding		20,117		22,398		21,226		22,573
Weighted average common equivalent shares		548		460		464		445
Diluted weighted average common shares outstanding		20,665		22,858		21,690		23,018
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive		608		967		700		644