Stock-based Compensation Plans - Additional Information 2 (Detail) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from the sales of common stock held by the deferred compensation plan	$ 13,102,000	$ 8,298,000	$ 15,964,000
Total intrinsic value of stock options and SARs exercised	0	$ 5,400,000	$ 27,100,000
Aggregate intrinsic value of the awards outstanding	0
Aggregate intrinsic value of the awards exercisable	$ 0
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average remaining contractual life of awards exercisable	1 year
Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	973,491	587,711	356,194
Vesting period	3 years	3 years	3 years
Stock-based compensation expense	$ 22,800,000	$ 23,800,000	$ 28,100,000
Unrecognized compensation related to Awards	$ 24,700,000
Weighted average period	1 year 9 months 18 days
Granted, weighted average grant date fair value	$ 28.51	$ 52.29	$ 84.87
Restricted Stock Liability Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	540,128	343,397	272,052
Stock-based compensation expense	$ 18,600,000	$ 20,800,000	$ 26,300,000
Unrecognized compensation related to Awards	$ 17,700,000
Weighted average period	1 year 9 months 18 days
Granted, weighted average grant date fair value	$ 35.92	$ 55.92	$ 87.34
Restricted Stock Liability Awards \| Non Employee Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	59,000	48,000	64,000
Restricted Stock Liability Awards \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	481,000	295,000	208,000
Vesting period	3 years	3 years	3 years
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Unrecognized compensation related to Awards	$ 0
Number of fully vested awards and awards expected to vest	1,000,000
Weighted average exercise price of fully vested awards and awards expected to vest	$ 69.08
Weighted average exercise price of fully vested awards and awards expected to vest in years	8 months 12 days

The cash inflow from the sales of common stock held by the deferred compensation plan.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

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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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).

+ References

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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No definition available.

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

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- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Accounting Standards Codification
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