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Employee maximum elected percentage reduction of compensation to purchase shares pursuant to employee stock purchase plan.

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Required minimum holding period of shares acquired under employee stock purchase plan.

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Duration of each purchase period under employee stock purchase plan.

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Required number of service hours per week to qualify to participate in Employee Stock Purchase Plan.

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Percentage of the voting rights of all classes of stock above which any ISO grants made to the holder of such rights are subject to restrictions in grant date value.

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Value divided by the fair market value of a share of common stock on the first day of the purchase period. The result of which is used to derive the maximum number of shares that may be purchased by each participant in a purchase period, pursuant to the employee stock purchase program.

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

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

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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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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options outstanding, including both vested and non-vested options.

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Purchase price of common stock expressed as a percentage of its fair value.

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Amount of stock repurchase plan authorized.

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Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended												12 Months Ended
	Apr. 03, 2013	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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2014	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized		500,000us-gaap_PreferredStockSharesAuthorized				500,000us-gaap_PreferredStockSharesAuthorized								500,000us-gaap_PreferredStockSharesAuthorized	500,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value		$ 0.01				$ 0.01								$ 0.01	$ 0.01
Authorized to purchase of common stock under the stock repurchase program		$ 410,000,000												$ 410,000,000			$ 25,000,000
Cumulative repurchase of common stock		14,400,000forr_CumulativeRepurchaseOfCommonStock												14,400,000forr_CumulativeRepurchaseOfCommonStock
Aggregate cost of repurchase of common stock														402,200,000
Tender offer repurchase maximum	130,000,000
Tender offer increment in per share value	$ 0.25
Tender Offer purchase of common stock	2,054,732
Tender offer purchase price of common stock per share	$ 36.00
Tender offer shares aggregate purchase price	74,000,000
Expenses related to tender offer	1,100,000
Tender offer expired date	May 01, 2013
Treasury stock, retired															11,700,000us-gaap_TreasuryStockSharesRetired
Carrying value of retired stock															303,000,000
Dividend declared and paid per share		$ 0.16	$ 0.16	$ 0.16	$ 0.16	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.14	$ 0.14	$ 0.14	$ 0.14
Dividend declared per share														$ 0.64	$ 0.60	$ 0.56
Aggregate dividend declared for the year														12,000,000us-gaap_Dividends	12,400,000us-gaap_Dividends	12,600,000us-gaap_Dividends
Option Outstanding and vested		1,954,000				1,734,000								1,954,000	1,734,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tender offer authorized price per share	$ 32.00
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tender offer authorized price per share	$ 36.00
Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future awards granted or issued under plans		12,000												12,000
Number of installments upon which share based awards vest														4
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value for RSUs granted														$ 36.67	$ 34.58	$ 33.88
Number of shares received per restricted stock unit on lapse of restrictions and vesting condition met														1
Value of RSUs vested and converted to common stock														3,500,000	2,400,000	1,600,000
Restricted Stock Units (RSUs) [Member] \| Equity Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vested period														3 years
Restricted Stock Units (RSUs) [Member] \| Equity Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vested period														4 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised														2,300,000	6,100,000	3,500,000
2006 Equity Plan [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future awards granted or issued under plans		1,300,000												1,300,000
Shares authorized										4,350,000						4,350,000
Options vested period														4 years
Option expiration period														10 years
1996 Equity Plan [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future awards granted or issued under plans		0												0
Shares authorized		13,500,000												13,500,000
Shares returned																2,500,000
Option expiration period														10 years
Percentage of voting rights that trigger ISO fmv grant conditions														10.00%
Exercise price rate of fair value														110.00%
Option Outstanding and vested		24,000												24,000
1996 Equity Plan [Member] \| Equity Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vested period														2 years
1996 Equity Plan [Member] \| Equity Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vested period														4 years
2006 Director Plan [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future awards granted or issued under plans		0												0
Shares authorized		450,000												450,000
Shares returned																80,000
Option Outstanding and vested		200,000												200,000
Number of shares of common stock options entitlement of non- employee directors																		6,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future awards granted or issued under plans		300,000												300,000
Shares authorized		1,500,000												1,500,000
Exercise price rate of fair value														85.00%
Hours of work per week														20
Duration of purchase periods under employee stock purchase plan														6 months
Holding period of stocks acquired under employee stock purchase plan														1 year
Value used to derive maximum number of shares per participant for employee stock purchase														$ 12,500
Employee maximum elected percentage reduction of compensation to purchase shares														10.00%
1996 Director [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future awards granted or issued under plans		0												0
Option Outstanding and vested		13,000												13,000
Prior to 2011 [Member] \| Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future awards granted or issued under plans		12,500												12,500