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Stockholders' Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 30, 2015	Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend paid per share	$ 0.17us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.16us-gaap_CommonStockDividendsPerShareCashPaid
Aggregate dividend declared for the year	$ 3,100,000us-gaap_Dividends	$ 3,100,000us-gaap_Dividends
Cash dividends declared per common share	$ 0.17us-gaap_CommonStockDividendsPerShareDeclared	$ 0.16us-gaap_CommonStockDividendsPerShareDeclared
Authorized to purchase of common stock under the stock repurchase program	435,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1			25,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Repurchase of common Stock	0.2forr_CommonStockRepurchasedDuringPeriodShares	0.8forr_CommonStockRepurchasedDuringPeriodShares
Cumulative aggregate cost of repurchase of common stock	5,700,000us-gaap_TreasuryStockValueAcquiredCostMethod	29,700,000us-gaap_TreasuryStockValueAcquiredCostMethod
Cumulative repurchase of common stock	14.5forr_CumulativeRepurchaseOfCommonStock
Aggregate cost of repurchase of common stock	$ 407,900,000forr_CumulativeCommonStockPurchasedProgramLifeToDateValue
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividends declared per common share			$ 0.17us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Dividend payable date			Jun. 24, 2015
Dividend payable record date			Jun. 10, 2015

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Number of shares of common stock repurchased under the stock repurchase program during the period.

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Number of shares of common stock repurchased under the stock repurchase program over the life of the plan to date.

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher SEC

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-Number 210

-Section 04

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of stock repurchase plan authorized.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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