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Non-Marketable Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying value of the Company's non-marketable investments	$ 3,800,000forr_CostAndEquityMethodInvestments	$ 5,700,000forr_CostAndEquityMethodInvestments
Gross distributions received from funds	1,500,000forr_CostMethodInvestmentOwnedIncomeReceivedFromFundDuringPeriod	400,000forr_CostMethodInvestmentOwnedIncomeReceivedFromFundDuringPeriod	500,000forr_CostMethodInvestmentOwnedIncomeReceivedFromFundDuringPeriod
Gain (losses) from non-marketable investments	(300,000)us-gaap_RealizedInvestmentGainsLosses	(600,000)us-gaap_RealizedInvestmentGainsLosses	100,000us-gaap_RealizedInvestmentGainsLosses
Book value of investment	700,000us-gaap_CostMethodInvestments	900,000us-gaap_CostMethodInvestments
Bonus paid under cash bonus plan	$ 0forr_CashBonusPaidDuringPeriodUnderBonusPlan
Cash bonus plan expiration date	Jun. 30, 2015
Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Participant in the cash bonus plan	10forr_NumberOfParticipantInCashBonusPlan / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Ownership interest of Company	5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember

X

- Definition

Amount of bonus paid under a cash bonus plan adopted to pay a bonus to certain key employees after the return of invested capital from certain of the company's investments.

+ References

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- Definition

Expiration date of a cash bonus plan adopted to pay a bonus to certain key employees after the return of invested capital from certain of the company's investments.

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Carrying amount of investments in equity method investees and the carrying amount, after adjustment, of cost-method investments.

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- Definition

Gross income received from cost method investments funds during the period.

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- Definition

Minimum number of remaining participants to prevent automatic expiration of a cash bonus plan adopted to pay a bonus to certain key employees after the return of invested capital from certain of the company's investments.

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- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

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-Name Accounting Standards Codification

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

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-URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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- Definition

The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3(a))

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



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-URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Article 7

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