Stock-based Compensation Plans - Additional Information 2 (Detail) - USD ($)	3 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		1 year
Unrecognized compensation related to Awards		$ 427,000
Weighted average period		1 year 8 months 12 days
Accelerated vesting of equity grants	$ 30,800,000		$ 30,800,000
Proceeds from the sales of common stock held by the deferred compensation plan		$ 9,747,000	$ 4,482,000	$ 13,102,000
Restricted Stock Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted		1,834,883	888,326	973,491
Vesting period		3 years	3 years	3 years
Stock-based compensation expense		$ 24,200,000	$ 23,400,000	$ 22,800,000
Unrecognized compensation related to Awards		$ 25,800,000
Weighted average period		1 year 8 months 12 days
Granted, weighted average grant date fair value		$ 16.98	$ 32.61	$ 28.51
Restricted Stock Liability Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted		891,350	543,438	540,128
Stock-based compensation expense		$ 11,700,000	$ 30,400,000	$ 18,600,000
Unrecognized compensation related to Awards		$ 2,400,000
Weighted average period		1 year 9 months 18 days
Granted, weighted average grant date fair value		$ 15.30	$ 25.91	$ 35.92
Accelerated vesting of equity grants			$ 15,400,000
Restricted Stock Liability Awards \| Non Employee Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted		146,000	90,000	59,000
Restricted Stock Liability Awards \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted		745,000	453,000	481,000
Vesting period		3 years	3 years	3 years

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

No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-Section S99
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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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.

+ References

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- Definition

Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

+ References

No definition available.

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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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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).

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- Definition

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.

+ References

No definition available.

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