The total fair value of shares cancelled/relinquished during the period under a deferred compensation arrangement.

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The number of shares (or other type of equity) issuable under an equity-based award plan pertaining to grants made during the period, net of forfeitures on other than stock (or unit) option plans.

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Description of the period of time over which a director's right to exercise an award is no longer contingent on the passage of time, which may be expressed in a variety of ways (for example, in years, month and year).

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total fair value of shares issued during the period under a deferred compensation arrangement.

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The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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 difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares related to Restricted Stock Award forfeited during the period.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Equity Incentive Awards - Additional Information (Detail) (USD $)	12 Months Ended				1 Months Ended									3 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 31, 2014	May 13, 2014	May 31, 2013	Mar. 31, 2013	Jan. 31, 2013	May 08, 2012	Jan. 31, 2012	Apr. 30, 2013	Feb. 28, 2013	Sep. 30, 2012	Feb. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,085,600	1,085,600	1,105,600	1,265,600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	2 years 1 month 1 day	3 years 1 month 1 day	4 years 6 days	4 years 10 months 21 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	3,563,334
Stock Issued During Period, Shares, Restricted Stock Award, Gross	186,666	173,332	214,664
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			(36,666)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 0	$ 500,000	$ 1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	32,100,000	15,500,000	13,100,000
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	3,750,000
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights					One-third	One-third	One-third	One-third	One-third	One-third	One-third
Senior Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights					Full						Full	Full	Full
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense, restricted stock grant	7,600,000	6,000,000	5,800,000
Share based compensation expense to be recognized	3,700,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 5 months 3 days
Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					62,000	40,000	40,000	666	62,000	32,000	62,000
Share based compensation, fair market value					2,600,000	1,700,000	1,700,000	24,800	2,200,000	1,100,000	2,200,000
Restricted Stock [Member] \| Senior Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					84,666						120,664	2,000	68,666
Share based compensation, fair market value					3,600,000						4,200,000	80,200	2,500,000
Share based compensation, restricted stock, vesting date					Dec. 31, 2014						Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period														36,666
DeferredCompensationArrangementWithIndividualFairValueOfSharesCancelled														1,300,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodNetOfForfeitures	100,900	99,788	94,020	94,020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(185,554)	(167,564)	(177,998)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 40.51	$ 34.97	$ 32.30
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 35.07
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 42.61	$ 37.32	$ 35.06
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 41.09	$ 37.17	$ 32.97	27.75
Phase One [Member] \| Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, restricted stock, vesting date					Dec. 31, 2014	Nov. 13, 2014	Nov. 08, 2013	Sep. 13, 2013	Dec. 31, 2013	Nov. 08, 2012	Dec. 31, 2012
Phase Two [Member] \| Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, restricted stock, vesting date					Dec. 31, 2015	May 13, 2015	May 08, 2014	Mar. 13, 2014	Dec. 31, 2014	May 08, 2013	Dec. 31, 2013
Phase Three [Member] \| Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, restricted stock, vesting date					Dec. 31, 2016	May 13, 2016	May 08, 2015	Mar. 13, 2015	Dec. 31, 2015	May 08, 2014	Dec. 31, 2014
Subsequent Event [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights															One-third
Subsequent Event [Member] \| Senior Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights															Full
Subsequent Event [Member] \| Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period															47,100
Share based compensation, fair market value															2,600,000
Subsequent Event [Member] \| Restricted Stock [Member] \| Senior Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period															78,000
Share based compensation, fair market value															4,300,000
Share based compensation, restricted stock, vesting date															Dec. 31, 2015
Subsequent Event [Member] \| Phase One [Member] \| Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, restricted stock, vesting date															Dec. 31, 2015
Subsequent Event [Member] \| Phase Two [Member] \| Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, restricted stock, vesting date															Dec. 31, 2016
Subsequent Event [Member] \| Phase Three [Member] \| Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, restricted stock, vesting date															Dec. 31, 2017