Stock-Based Compensation - Additional Information (Detail)	12 Months Ended
Dec. 31, 2015 USD ($) $ / shares Installment Anniversaries	Dec. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercise prices as percentage of the market value on the date of the grant	100.00%
Total intrinsic value of options exercised	$ 100,000	$ 2,000,000	$ 0
Total aggregate intrinsic value of options	3,100,000
Total aggregate intrinsic value of option exercisable	$ 3,100,000
Grant date fair value of options granted \| $ / shares	$ 11.71	$ 17.48	$ 15.03
Compensation expenses for stock options	$ 7,400,000	$ 7,700,000	$ 8,600,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	3 years
Stock options term, years	10 years
Unrecognized compensation expense related to stock	$ 1,300,000
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	2 years 2 months 12 days
Restricted Stock [Member] \| LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of restricted stock award vesting on anniversary	33.30%
Eligible age of officer for LTIP restricted stock award	55 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 31,300,000
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	2 years 1 month 6 days
Number of anniversaries of grant date upon which restricted stock units vest \| Anniversaries	3
Installments in which restricted stock units vest and are converted to common stock \| Installment	3
Compensation expense	$ 34,800,000	32,600,000	32,600,000
Total fair value of shares, vested	$ 35,800,000	38,100,000	34,100,000
Restricted Stock Units [Member] \| AIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of annual incentive award payment participant can elect to defer	50.00%
Additional common stock units for election of deferred annual incentive award, percentage	25.00%
Restricted Stock And Restricted Stock Units [Member] \| AIP and LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 800,000
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	1 year 7 months 6 days
Compensation expense	$ 3,400,000	6,100,000	6,300,000
Total fair value of shares, vested	$ 6,500,000	$ 6,800,000	$ 5,700,000

Additional common stock units for election of deferred annual incentive award, percentage.

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Age for eligible employee.

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Amount of annual incentive award payment participant can elect to defer.

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Fraction of restricted stock award vesting on anniversary.

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Installments in which restricted stock units vest and are converted to common stock.

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Number of anniversaries of grant date upon which restricted stock units vest.

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Stock option exercise price as percentage of market value.

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The period in which a stock option can be exercised.

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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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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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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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