Stock-based Compensation Plans - Additional Information 2 (Detail) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation related to Awards	$ 768,000
Weighted average period	1 year
Proceeds from the sales of common stock held by the deferred compensation plan	$ 696,000	$ 667,000	$ 9,747,000
Restricted Stock Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	4,462,711	2,800,000	1,800,000
Vesting period	3 years
Stock-based compensation expense	$ 17,800,000	$ 22,500,000	$ 24,200,000
Unrecognized compensation related to Awards	$ 15,100,000
Weighted average period	1 year 7 months 6 days
Granted, weighted average grant date fair value	$ 3.42
Restricted Stock Liability Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	3,535,093	1,200,000	891,000
Stock-based compensation expense	$ 10,300,000	$ 9,300,000	$ 11,700,000
Unrecognized compensation related to Awards	$ 4,200,000
Weighted average period	1 year 4 months 24 days
Granted, weighted average grant date fair value	$ 3.18	$ 10.16	$ 15.30
Restricted Stock Liability Awards \| Non-Employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	217,000	183,000	146,000
Restricted Stock Liability Awards \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	3,300,000	1,000,000.0	745,000
Vesting period	3 years	3 years	3 years

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

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-Section S99
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-Subparagraph (SAB Topic 14.F)
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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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-Publisher FASB
-Name Accounting Standards Codification
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

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