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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
	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	$ 80,681us-gaap_SalesRevenueServicesNet	$ 75,363us-gaap_SalesRevenueServicesNet	$ 82,947us-gaap_SalesRevenueServicesNet	$ 73,071us-gaap_SalesRevenueServicesNet	$ 77,521us-gaap_SalesRevenueServicesNet	$ 69,815us-gaap_SalesRevenueServicesNet	$ 78,953us-gaap_SalesRevenueServicesNet	$ 71,361us-gaap_SalesRevenueServicesNet	$ 312,062us-gaap_SalesRevenueServicesNet	$ 297,650us-gaap_SalesRevenueServicesNet	$ 293,031us-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									232,440us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_US	218,900us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_US	211,211us-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									30,257us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_EuropeExcludingUnitedKingdomMember	30,956us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_EuropeExcludingUnitedKingdomMember	33,146us-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									16,804us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_GB	16,293us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_GB	16,555us-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									17,089us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA	16,995us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = country_CA	16,742us-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									$ 15,472us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_OtherCountryMember	$ 14,506us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = forr_OtherCountryMember	$ 15,377us-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

X

- 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.

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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

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