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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
	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 80,001us-gaap_Goodwill	$ 78,954us-gaap_Goodwill
Translation adjustments	(3,318)us-gaap_GoodwillTranslationAdjustments	1,047us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance	76,683us-gaap_Goodwill	80,001us-gaap_Goodwill
BT [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		43,491us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_BusinessTechnologyMember
Translation adjustments		577us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_BusinessTechnologyMember
Goodwill, Ending Balance		44,068us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_BusinessTechnologyMember
M&S [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		33,362us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_MarketingAndStrategyMember
Translation adjustments		442us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_MarketingAndStrategyMember
Goodwill, Ending Balance		33,804us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_MarketingAndStrategyMember
Events [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		2,101us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_EventsMember
Translation adjustments		28us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_EventsMember
Goodwill, Ending Balance		2,129us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_EventsMember
Products Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	2,560us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_ProductsSegmentMember
Translation adjustments	(106)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_ProductsSegmentMember
Goodwill, Ending Balance	2,454us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_ProductsSegmentMember
Research Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	77,441us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_ResearchSegmentMember
Translation adjustments	(3,212)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = forr_ResearchSegmentMember
Goodwill, Ending Balance	74,229us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = forr_ResearchSegmentMember
Project Consulting [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance
Translation adjustments
Goodwill, Ending Balance

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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X

- Details

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X

- Details

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Period Type:

X

- Details

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X

- Details

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- Details

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- Details

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