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Operating Segment and Enterprise Wide Reporting - Schedule of Net Revenues by Geographic Destination and as a Percentage of Total Revenues (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 80,681 us-gaap_SalesRevenueServicesNet | $ 75,363 us-gaap_SalesRevenueServicesNet | $ 82,947 us-gaap_SalesRevenueServicesNet | $ 73,071 us-gaap_SalesRevenueServicesNet | $ 77,521 us-gaap_SalesRevenueServicesNet | $ 69,815 us-gaap_SalesRevenueServicesNet | $ 78,953 us-gaap_SalesRevenueServicesNet | $ 71,361 us-gaap_SalesRevenueServicesNet | $ 312,062 us-gaap_SalesRevenueServicesNet | $ 297,650 us-gaap_SalesRevenueServicesNet | $ 293,031 us-gaap_SalesRevenueServicesNet
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 100.00%forr_RevenuesByGeographicalAreaPercentage | 100.00%forr_RevenuesByGeographicalAreaPercentage | 100.00%forr_RevenuesByGeographicalAreaPercentage
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 232,440 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_US | 218,900 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_US | 211,211 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_US
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 74.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_US | 74.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_US | 72.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_US
Europe (Excluding United Kingdom) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30,257 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_EuropeExcludingUnitedKingdomMember | 30,956 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_EuropeExcludingUnitedKingdomMember | 33,146 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_EuropeExcludingUnitedKingdomMember
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 10.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = forr_EuropeExcludingUnitedKingdomMember | 10.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = forr_EuropeExcludingUnitedKingdomMember | 11.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = forr_EuropeExcludingUnitedKingdomMember
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 16,804 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_GB | 16,293 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_GB | 16,555 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_GB
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 5.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_GB | 5.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_GB | 6.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_GB
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 17,089 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA | 16,995 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA | 16,742 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 6.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_CA | 6.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_CA | 6.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = country_CA
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 15,472 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_OtherCountryMember | $ 14,506 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_OtherCountryMember | $ 15,377 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_OtherCountryMember
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 5.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = forr_OtherCountryMember | 5.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = forr_OtherCountryMember | 5.00%forr_RevenuesByGeographicalAreaPercentage / us-gaap_StatementGeographicalAxis = forr_OtherCountryMember

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- Definition Revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts generated in the geographical area as a percentage of total global revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References No definition available. + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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