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Marketable Investments - Summary of Maturity Periods of the Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Total |  | $ 81,013 us-gaap_AvailableForSaleSecurities
Federal Agency and Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
FY 2015 | 21,076 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = forr_FederalAgencyAndCorporateObligationsMember |
FY 2016 | 16,109 forr_AvailableForSaleSecuritiesDebtMaturitiesYearTwoFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = forr_FederalAgencyAndCorporateObligationsMember |
FY 2017 | 17,700 forr_AvailableForSaleSecuritiesDebtMaturitiesYearThreeFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = forr_FederalAgencyAndCorporateObligationsMember |
Total | $ 54,885 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = forr_FederalAgencyAndCorporateObligationsMember | $ 74,199 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = forr_FederalAgencyAndCorporateObligationsMember

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- Definition Fair value of available-for-sale debt securities maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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