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Goodwill and Other Intangible Assets - Summary of Goodwill by Segment and Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 80,001 us-gaap_Goodwill | $ 78,954 us-gaap_Goodwill
Translation adjustments | (3,318)us-gaap_GoodwillTranslationAdjustments | 1,047 us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance | 76,683 us-gaap_Goodwill | 80,001 us-gaap_Goodwill
BT [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance |  | 43,491 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_BusinessTechnologyMember
Translation adjustments |  | 577 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_BusinessTechnologyMember
Goodwill, Ending Balance |  | 44,068 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_BusinessTechnologyMember
M&S [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance |  | 33,362 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_MarketingAndStrategyMember
Translation adjustments |  | 442 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_MarketingAndStrategyMember
Goodwill, Ending Balance |  | 33,804 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_MarketingAndStrategyMember
Events [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance |  | 2,101 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_EventsMember
Translation adjustments |  | 28 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_EventsMember
Goodwill, Ending Balance |  | 2,129 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_EventsMember
Products Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 2,560 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_ProductsSegmentMember |
Translation adjustments | (106)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_ProductsSegmentMember |
Goodwill, Ending Balance | 2,454 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_ProductsSegmentMember |
Research Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 77,441 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_ResearchSegmentMember |
Translation adjustments | (3,212)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_ResearchSegmentMember |
Goodwill, Ending Balance | 74,229 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_ResearchSegmentMember |
Project Consulting [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance |  |
Translation adjustments |  |
Goodwill, Ending Balance |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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