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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 39,274 us-gaap_FiniteLivedIntangibleAssetsGross | $ 40,206 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | 35,892 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 34,429 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total | 3,382 us-gaap_FiniteLivedIntangibleAssetsNet | 5,777 us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,995 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 33,927 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization | 29,613 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 28,552 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Total | 3,382 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 5,375 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Research Content [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4,699 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = forr_ResearchContentMember | 4,699 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = forr_ResearchContentMember
Accumulated Amortization | 4,699 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = forr_ResearchContentMember | 4,699 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = forr_ResearchContentMember
Total | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = forr_ResearchContentMember |
Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,507 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember | 1,507 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Accumulated Amortization | 1,507 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember | 1,105 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Total | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember | 402 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 73 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 73 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Accumulated Amortization | 73 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 73 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Total | $ 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |

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