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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2012	Aug. 06, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	FORRESTER RESEARCH INC
Entity Central Index Key	0001023313
Document Type	10-Q
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		22,418,000

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 87,663	$ 81,047
Marketable investments (Note 3)	148,777	136,991
Accounts receivable, net	47,545	81,378
Deferred commissions	9,370	12,010
Prepaid expenses and other current assets	24,934	25,935
Total current assets	318,289	337,361
Long-term marketable investments (Note 3)	9,686	9,565
Property and equipment, net	48,840	50,448
Goodwill	71,388	71,543
Intangible assets, net	9,029	10,317
Other assets	11,689	8,344
Total assets	468,921	487,578
Current Liabilities:
Accounts payable	982	1,223
Accrued expenses and other current liabilities	28,775	30,153
Deferred revenue	134,550	147,887
Total current liabilities	164,307	179,263
Non-current liabilities	17,444	17,580
Total liabilities	181,751	196,843
Commitments
Stockholders' Equity (Note 7):
Preferred stock, $.01 par value, Authorized - 500 shares, issued and outstanding - none
Common stock, $.01 par value,Authorized - 125,000 shares,Issued - 31,255 and 30,962 as of June 30, 2012 and December 31, 2011, respectively Outstanding- 22,530 and 22,747 as of June 30, 2012 and December 31, 2011, respectively	313	310
Additional paid-in capital	382,494	373,591
Retained earnings	109,256	104,662
Treasury stock- 8,725 and 8,215 as of June 30, 2012 and December 31, 2011, respectively, at cost	(198,052)	(181,000)
Accumulated other comprehensive loss	(6,841)	(6,828)
Total stockholders' equity	287,170	290,735
Total liabilities and stockholders' equity	$ 468,921	$ 487,578

Consolidated Balance Sheets (Parenthetical) (Unaudited) - $ / shares shares in Thousands	Jun. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheets [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	31,255	30,962
Common stock, Shares Outstanding	22,530	22,747
Treasury stock, Shares	8,725	8,215

Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Research services	$ 51,072	$ 47,341	$ 100,832	$ 91,888
Advisory services and other	28,021	26,109	48,521	47,304
Total revenues	79,093	73,450	149,353	139,192
Operating expenses:
Cost of services and fulfillment	29,828	28,024	56,766	53,522
Selling and marketing	26,267	26,009	51,400	51,474
General and administrative	8,645	8,330	18,256	17,248
Depreciation	2,255	945	4,248	1,915
Amortization of intangible assets	586	526	1,200	1,219
Reorganization costs	51		1,394
Total operating expenses	67,632	63,834	133,264	125,378
Income from operations	11,461	9,616	16,089	13,814
Other income (expense), net	130	4	539	(105)
Gains on investments, net	84	58	143	640
Income before income taxes	11,675	9,678	16,771	14,349
Income tax provision	3,906	4,208	5,821	5,968
Net income	$ 7,769	$ 5,470	$ 10,950	$ 8,381
Basic income per common share	$ 0.34	$ 0.24	$ 0.48	$ 0.37
Diluted income per common share	$ 0.34	$ 0.24	$ 0.47	$ 0.36
Basic weighted average common shares outstanding	22,583	22,684	22,660	22,698
Diluted weighted average common shares outstanding	23,023	23,203	23,098	23,227
Cash dividends declared per common share	$ 0.14		$ 0.28

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 7,769	$ 5,470	$ 10,950	$ 8,381
Other comprehensive income (loss), net of taxes:
Cumulative translation adjustments	(1,013)	627	(332)	2,891
Changes in market value of investments:
Unrealized gain, net of taxes of $26 and $94 for the three months ended June 30, 2012 and 2011, and $166 and $3 for the six months ended June 30, 2012 and 2011	17	205	333	208
Less: reclassification adjustment for net gains realized in net income, net of taxes of $2 for the three months ended June 30, 2012, and $10 and $3 for the six months ended June 30, 2012 and 2011	(1)		(14)	(4)
Net change in market value of investments	16	205	319	204
Other comprehensive income (loss)	(997)	832	(13)	3,095
Comprehensive income	$ 6,772	$ 6,302	$ 10,937	$ 11,476

Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Taxes (benefits) on unrealized gain (loss)	$ 26	$ 94	$ 166	$ 3
Taxes (benefits) on reclassification adjustment	$ 2		$ 10	$ 3

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 10,950	$ 8,381
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,248	1,915
Amortization of intangible assets	1,200	1,219
Net gains from investments	(143)	(640)
Deferred income taxes	(4,291)	1,754
Stock-based compensation	2,512	1,681
Amortization of premium on investments	1,460	1,683
Foreign currency losses	239	1,011
Changes in assets and liabilities, net of acquisitions
Accounts receivable	33,661	27,160
Deferred commissions	2,647	1,834
Prepaid expenses and other current assets	234	(590)
Accounts payable	(244)	(1,044)
Accrued expenses and other liabilities	(130)	(2,699)
Deferred revenue	(12,944)	(3,522)
Net cash provided by operating activities	39,399	38,143
Cash flows from investing activities:
Acquisitions		(7,031)
Purchases of property and equipment	(3,245)	(26,100)
Purchases of marketable investments	(65,713)	(48,361)
Proceeds from sales and maturities of marketable investments	52,845	31,624
Change in restricted cash	946	11,175
Other investing activity	124	247
Net cash used in investing activities	(15,043)	(38,446)
Cash flows from financing activities:
Dividends paid on common stock	(6,356)
Repurchases of common stock	(17,052)	(13,395)
Proceeds from issuance of common stock under employee equity incentive plans	6,634	6,425
Excess tax benefits from stock-based compensation	332	332
Payment of deferred acquisition consideration	(739)
Net cash used in financing activities	(17,181)	(6,638)
Effect of exchange rate changes on cash and cash equivalents	(559)	3,199
Net increase (decrease) in cash and cash equivalents	6,616	(3,742)
Cash and cash equivalents, beginning of period	81,047	86,927
Cash and cash equivalents, end of period	$ 87,663	$ 83,185

Interim Consolidated Financial Statements

6 Months Ended

Jun. 30, 2012

Interim Consolidated Financial Statements [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, 2011. 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 six months ended June 30, 2012 may not be indicative of the results for the year ending December 31, 2012, or any other period.

Acquisition (Details) $ in Thousands	Jun. 30, 2012 USD ($)
Assets:
Cash	$ 85
Accounts receivable	561
Other current assets	285
Goodwill	3,695
Intangible assets	4,815
Total assets	9,441
Liabilities:
Accrued expenses	160
Deferred revenue	312
Total liabilities	472
Net assets acquired	$ 8,969

Acquisition (Details 1) $ in Thousands	6 Months Ended
Acquisition (Details 1) $ in Thousands	Jun. 30, 2012 USD ($)
Summary of identifiable intangible assets acquired and their respective weighted average lives
Intangible Assets, Assigned Value	$ 4,815
Customer Relationships [Member]
Summary of identifiable intangible assets acquired and their respective weighted average lives
Intangible Assets, Assigned Value	$ 3,605
Intangible Assets, Useful Life	7 years 6 months
Research Content [Member]
Summary of identifiable intangible assets acquired and their respective weighted average lives
Intangible Assets, Assigned Value	$ 1,080
Intangible Assets, Useful Life	1 year 6 months
Backlog [Member]
Summary of identifiable intangible assets acquired and their respective weighted average lives
Intangible Assets, Assigned Value	$ 130
Intangible Assets, Useful Life	1 year

Acquisition (Details Textual) - USD ($) $ in Millions	May 12, 2011	Jun. 30, 2012
Business Acquisition [Line Items]
Entity acquisition liability incurred		$ 2.3
Acquisition (Textual) [Abstract]
Business Acquisition Effective Date	May 12, 2011
Purchase Price		9.0
Cash paid on acquisition date	$ 6.7	1.2
Payment for employee retention and Lease extension		0.9
Goodwill deductible for tax purpose		2.1
Accrued Liabilities [Member]
Business Acquisition [Line Items]
Entity acquisition liability incurred		$ 1.1

Marketable Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale securities
Amortized Cost	$ 159,632	$ 148,202
Gross Unrealized Gains	260	136
Gross Unrealized Losses	(1,429)	(1,782)
Total available-for-sale securities	158,463	146,556
State and municipal bonds [Member]
Available-for-sale securities
Amortized Cost	14,093	9,485
Gross Unrealized Gains	7	9
Gross Unrealized Losses	(4)	(12)
Total available-for-sale securities	14,096	9,482
Federal agency and corporate obligations [Member]
Available-for-sale securities
Amortized Cost	134,539	127,717
Gross Unrealized Gains	253	127
Gross Unrealized Losses	(111)	(335)
Total available-for-sale securities	134,681	127,509
Total short-term available-for-sale securities [Member]
Available-for-sale securities
Amortized Cost	148,632	137,202
Gross Unrealized Gains	260	136
Gross Unrealized Losses	(115)	(347)
Total available-for-sale securities	148,777	136,991
ARS, long-term [Member]
Available-for-sale securities
Amortized Cost	11,000	11,000
Gross Unrealized Gains
Gross Unrealized Losses	(1,314)	(1,435)
Total available-for-sale securities	$ 9,686	$ 9,565

Marketable Investments (Details 1) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Summary of Auction Rate Securities at their contractual maturity date
FY 2012, Total	$ 26,798
FY2013, Total	52,483
FY2014, Total	53,400
Thereafter, Total	25,782
Total available-for-sale securities	158,463	$ 146,556
State and municipal bonds [Member]
Summary of Auction Rate Securities at their contractual maturity date
FY 2012, Total	2,001
FY2013, Total	3,969
FY2014, Total	8,126
Thereafter, Total
Total available-for-sale securities	14,096	9,482
Federal agency and corporate obligations [Member]
Summary of Auction Rate Securities at their contractual maturity date
FY 2012, Total	24,797
FY2013, Total	48,514
FY2014, Total	45,274
Thereafter, Total	16,096
Total available-for-sale securities	134,681	$ 127,509
Auction Rate Securities [Member]
Summary of Auction Rate Securities at their contractual maturity date
FY 2012, Total
FY2013, Total
FY2014, Total
Thereafter, Total	9,686
Total available-for-sale securities	$ 9,686

Marketable Investments (Details 2) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Summary of the gross unrealized losses and market value of available for sale securities with unrealized losses
Available for sale securities, Less Than 12 Months, Market Value	$ 44,314	$ 71,725
Available for sale securities, Less Than 12 Months, Unrealized Losses	113	322
Available for sale securities, 12 Months or Greater, Market Value	13,718	12,715
Available for sale securities, 12 Months or Greater, Unrealized Losses	1,316	1,460
State and municipal bonds [Member]
Summary of the gross unrealized losses and market value of available for sale securities with unrealized losses
Available for sale securities, Less Than 12 Months, Market Value	5,410	2,763
Available for sale securities, Less Than 12 Months, Unrealized Losses	4	9
Available for sale securities, 12 Months or Greater, Market Value		1,107
Available for sale securities, 12 Months or Greater, Unrealized Losses		3
Federal agency and corporate obligations [Member]
Summary of the gross unrealized losses and market value of available for sale securities with unrealized losses
Available for sale securities, Less Than 12 Months, Market Value	38,904	68,962
Available for sale securities, Less Than 12 Months, Unrealized Losses	109	313
Available for sale securities, 12 Months or Greater, Market Value	4,032	2,043
Available for sale securities, 12 Months or Greater, Unrealized Losses	2	22
ARS [Member]
Summary of the gross unrealized losses and market value of available for sale securities with unrealized losses
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	9,686	9,565
Available for sale securities, 12 Months or Greater, Unrealized Losses	$ 1,314	$ 1,435

Marketable Investments (Details 3) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	$ 170,032	$ 153,342
Money market funds [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	4,704	5,786
State and municipal bonds [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	14,096	9,482
Federal agency and corporate obligations [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	141,546	128,509
ARS [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	9,686	9,565
Level 1 [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	4,704	5,786
Level 1 [Member] \| Money market funds [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	4,704	5,786
Level 1 [Member] \| State and municipal bonds [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis
Level 1 [Member] \| Federal agency and corporate obligations [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis
Level 1 [Member] \| ARS [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis
Level 2 [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	155,642	137,991
Level 2 [Member] \| Money market funds [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis
Level 2 [Member] \| State and municipal bonds [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	14,096	9,482
Level 2 [Member] \| Federal agency and corporate obligations [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	141,546	128,509
Level 2 [Member] \| ARS [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis
Level 3 [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	9,686	9,565
Level 3 [Member] \| Money market funds [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis
Level 3 [Member] \| State and municipal bonds [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis
Level 3 [Member] \| Federal agency and corporate obligations [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis
Level 3 [Member] \| ARS [Member]
Summary of Company's fair value hierarchy for its financial assets
Fair value of assets on recurring basis	$ 9,686	$ 9,565

Marketable Investments (Details 4) - ARS [Member] - Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Summary of Changes in fair value of Level 3 financial assets
Sales
Included in other comprehensive income (loss)	121	142
Fair value of assets, Ending Balance	$ 9,686	$ 9,259

Reorganization (Details) $ in Thousands	6 Months Ended
Reorganization (Details) $ in Thousands	Jun. 30, 2012 USD ($)
Summary of rolls forward the activity in the reorganization accrual
Accrual at December 31, 2011	$ 375
Additions	1,394
Cash payments	(1,567)
Accrual at June 30, 2012	$ 202

Reorganization (Details Textual) $ in Millions	3 Months Ended	6 Months Ended
Reorganization (Details Textual) $ in Millions	Dec. 31, 2011 USD ($) Person	Jun. 30, 2012 USD ($) Person
Reorganization (Textual) [Abstract]
Severance Costs \| $	$ 0.4	$ 1.4
Number of sales employees for which severance was incurred based on statutory termination benefits.	3
Number of additional employees terminated related to sales reorganization and other cost reduction initiatives.		17

Stockholders' Equity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2012 USD ($) $ / shares shares
Summary of stock option activity
Outstanding at December 31, 2011 \| shares	2,130
Weighted Average Exercise Price, Beginning Balance \| $ / shares	$ 27.46
Granted \| shares	359
Weighted Average Exercise Price, Granted \| $ / shares	$ 33.9
Exercised \| shares	(262)
Weighted Average Exercise Price ,Exercised \| $ / shares	$ 25.29
Forfeited \| shares	(47)
Weighted Average Exercise Price, Forfeited \| $ / shares	$ 31.23
Outstanding at June 30, 2012 \| shares	2,180
Weighted Average Exercise Price, Ending Balance \| $ / shares	$ 28.70
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	6 years 8 months 19 days
Aggregate Intrinsic Value, Outstanding, Ending Balance \| $	$ 11,726
Exercisable at June 30, 2012 \| shares	1,253
Weighted Average Exercise Price per share, exercisable \| $ / shares	$ 25.9
Weighted Average Remaining Contractual Term, Exercisable	5 years 1 month 10 days
Aggregate Intrinsic Value, Exercisable \| $	$ 10,080

Stockholders' Equity (Details 1) shares in Thousands	6 Months Ended
Stockholders' Equity (Details 1) shares in Thousands	Jun. 30, 2012 $ / shares shares
Details of Restricted stock unit activity
Number of Shares, Unvested at December 31, 2011 \| shares	267
Weighted Average Grant Date Fair Value ,Unvested Beginning Balance \| $ / shares	$ 29.93
Number of Shares, Granted \| shares	179
Weighted Average Grant Date Fair Value ,Granted \| $ / shares	$ 33.88
Number of Shares, Vested or Settled \| shares	(49)
Weighted Average Grant Date Fair Value, Vested \| $ / shares	$ 27.6
Number of Shares, Forfeited \| shares	(57)
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	$ 26.57
Number of Shares, Unvested at June 30, 2012 \| shares	340
Weighted Average Grant Date Fair Value , Ending Balance \| $ / shares	$ 32.92

Stockholders' Equity (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Stockholders' Equity (Details 2) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of Stock based compensation recorded in expense categories
Total Allocated Share-based Compensation Expense	$ 1,189	$ 243	$ 2,512	$ 1,681
Cost of Services and Fulfillment [Member]
Summary of Stock based compensation recorded in expense categories
Total Allocated Share-based Compensation Expense	725	32	1,378	647
Selling and Marketing [Member]
Summary of Stock based compensation recorded in expense categories
Total Allocated Share-based Compensation Expense	207	53	431	392
General and Administrative [Member]
Summary of Stock based compensation recorded in expense categories
Total Allocated Share-based Compensation Expense	$ 257	$ 158	$ 703	$ 642

Stockholders' Equity (Details 3) - $ / shares	3 Months Ended		6 Months Ended
Stockholders' Equity (Details 3) - $ / shares	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Equity Incentive Plans [Member]
Valuation of options granted under the equity incentive plans and shares subject to purchase under the employees stock purchase plan
Average risk-free interest rate	0.89%	1.69%	0.89%	1.63%
Expected dividend yield	1.70%		1.70%
Expected life	4 years 6 months	3 years 6 months	4 years 6 months	3 years 6 months
Expected volatility	40.00%	40.00%	40.00%	40.00%
Weighted average fair value	$ 9.81	$ 11.79	$ 9.84	$ 11.54
Employee Stock Purchase Plan [Member]
Valuation of options granted under the equity incentive plans and shares subject to purchase under the employees stock purchase plan
Average risk-free interest rate	0.14%	0.18%	0.14%	0.18%
Expected dividend yield	1.70%		1.70%
Expected life	6 months	6 months	6 months	6 months
Expected volatility	31.00%	28.00%	31.00%	28.00%
Weighted average fair value	$ 7.54	$ 7.55	$ 7.54	$ 7.55

Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009	Jun. 30, 2012	Jun. 30, 2011	Sep. 19, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's issued					340,000			267,000
Additional RSU's issued					179,000
Stockholders Equity (Textual) [Abstract]
Dividend declared per share					$ 0.28
Dividends Payable, Amount Per Share							$ 0.14
Aggregate dividend declared					$ 6,400
Purchase of Common Stock					$ 260,000
Repurchase of Common Stock					8,725,000			8,215,000
Aggregate cost of Repurchase of Common Stock					$ 198,052			$ 181,000
Cumulative Repurchase of Common Stock					8,700,000
Cumulative aggregate cost of Repurchase of Common Stock					$ 198,100
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's issued		71,000	63,000	95,496
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance of RSU's Vesting		100% or 40% on April 1, 2014	100% or 40% on April 1, 2013	100% or 40% on April 1, 2012
Performance of Outstanding RSU's				40.00%
Compensation expense Estimate vesting		100.00%	100.00%	100.00%
Modified Estimate vesting of RSU's	40.00%				0.00%	0.00%
Additional RSU's issued		48,000	42,000
Vest period of additional RSU's issued		4 years	4 years

Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Operating Segments (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of reportable segments
Revenue	$ 79,093	$ 73,450	$ 149,353	$ 139,192
Direct Margin	51,166	47,545	97,760	91,064
Selling, marketing, administrative and other expenses	(39,119)	(37,403)	(80,471)	(76,031)
Amortization of intangible assets	586	526	1,200	1,219
Income from operations	11,461	9,616	16,089	13,814
Business Technology [Member]
Summary of reportable segments
Revenue	40,559	37,830	80,215	74,285
Direct Margin	26,666	24,542	53,042	49,409
Marketing and Strategy [Member]
Summary of reportable segments
Revenue	30,186	28,928	60,035	56,210
Direct Margin	20,240	19,398	40,751	37,462
Events [Member]
Summary of reportable segments
Revenue	8,348	6,692	9,103	8,697
Direct Margin	$ 4,260	$ 3,605	$ 3,967	$ 4,193

Operating Segments (Details Textual)	6 Months Ended
Operating Segments (Details Textual)	Jun. 30, 2012 Segment
Operating Segments (Textual) [Abstract]
Number of Operating Segments	2
Company modified internal reporting structure and combined former Technology Industry client group segment into remaining client group	2

Label	Element	Value
Auction Rate Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	$ 9,117,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	$ 9,565,000