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Non-Marketable Investments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Carrying value of the Company's non-marketable investments | $ 3,800,000 forr_CostAndEquityMethodInvestments | $ 5,700,000 forr_CostAndEquityMethodInvestments |
Gross distributions received from funds | 1,500,000 forr_CostMethodInvestmentOwnedIncomeReceivedFromFundDuringPeriod | 400,000 forr_CostMethodInvestmentOwnedIncomeReceivedFromFundDuringPeriod | 500,000 forr_CostMethodInvestmentOwnedIncomeReceivedFromFundDuringPeriod
Gain (losses) from non-marketable investments | (300,000)us-gaap_RealizedInvestmentGainsLosses | (600,000)us-gaap_RealizedInvestmentGainsLosses | 100,000 us-gaap_RealizedInvestmentGainsLosses
Book value of investment | 700,000 us-gaap_CostMethodInvestments | 900,000 us-gaap_CostMethodInvestments |
Bonus paid under cash bonus plan | $ 0 forr_CashBonusPaidDuringPeriodUnderBonusPlan |  |
Cash bonus plan expiration date | Jun. 30, 2015 |  |
Maximum [Member] |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Participant in the cash bonus plan | 10 forr_NumberOfParticipantInCashBonusPlan / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Minimum [Member] |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Ownership interest of Company | 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |

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- Definition Minimum number of remaining participants to prevent automatic expiration of a cash bonus plan adopted to pay a bonus to certain key employees after the return of invested capital from certain of the company's investments. + References No definition available. + Details
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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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