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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Customer | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Significant Accounting Policy [Line Items] |  |  |
Major customer revenue | 1 billion-plus |  |
Original maturities | 90 days |  |
Number of customers accounted for revenues or accounts receivable greater than 2% of total | 0 forr_NumberOfCustomerOwningMoreThanSpecifiedPercentageOfRevenueOrAccountsReceivable |  |
Annual goodwill impairment test, period | November 30 |  |
Goodwill impairment charges | $ 0 us-gaap_GoodwillImpairmentLoss |  |
Number of business segment goodwill allocated on a relative fair value basis | 3 us-gaap_NumberOfOperatingSegments |  |
Non-current deferred rent liabilities | 6,501,000 us-gaap_DeferredRentCreditNoncurrent | 6,678,000 us-gaap_DeferredRentCreditNoncurrent |
Foreign exchange losses | 100,000 us-gaap_ForeignCurrencyTransactionGainLossRealized | 400,000 us-gaap_ForeignCurrencyTransactionGainLossRealized | 400,000 us-gaap_ForeignCurrencyTransactionGainLossRealized
Unamortized fair value stock based compensation | 15,800,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Weighted average remaining recognition period | 2 years 6 months |  |
Pre -Tax Expenses [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Additional income tax expense benefit related to out-of-period correction | 300,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis = forr_PreTaxImmaterialExpenseMember |  |
Post-Tax Expenses [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Additional income tax expense benefit related to out-of-period correction | 200,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis = forr_PostTaxImmaterialExpenseMember |  |
Depreciation Expenses [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Additional income tax expense benefit related to out-of-period correction | 400,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis = forr_DepreciationExpensesMember |  |
Other Immaterial Expenses [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Additional income tax expense benefit related to out-of-period correction | (100,000)us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis = forr_OtherImmaterialExpensesMember |  |
Additional Income Tax Expense [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Additional income tax expense benefit related to out-of-period correction | $ 500,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis = forr_IncomeTaxImmaterialExpenseMember |  |
Customer Concentration Risk [Member] | Research Service Revenue [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Customer accounted for percentage | 3.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |  |
Credit Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Customer accounted for percentage | 3.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember |  |
Stock Options [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Anti-dilutive Options to Purchase Shares | 0.6 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 0.7 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 0.8 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember

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