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Common Stock - Summary of Information Regarding Outstanding Restricted Shares (Detail) - Restricted Stock and Restricted Stock Units [Member] - $ / shares		12 Months Ended
	Feb. 27, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares Outstanding, Beginning balance		5,914,860	4,889,678	4,563,983
Restricted Stock Granted, Shares	2,895,086	3,335,315	2,657,115	1,738,589
Restricted Stock Vested, Shares		(2,901,945)	(1,242,682)	(1,018,206)
Restricted Stock Forfeited, Shares		(73,922)	(389,251)	(394,688)
Restricted Shares Outstanding, Ending balance		6,274,308	5,914,860	4,889,678
Weighted-Average Grant Date Fair Value of Restricted Stock, Beginning Balance		$ 34.41	$ 37.04	$ 41.10
Restricted Stock Granted, Weighted-Average Grant Date Fair Value	$ 28.72	28.52	35.17	38.74
Restricted Stock Vested, Weighted-Average Grant Date Fair Value		25.67	34.86	34.84
Restricted Stock Forfeited, Weighted-Average Grant Date Fair Value		50.57	57.56	55.22
Weighted-Average Grant Date Fair Value of Restricted Stock, Ending Balance		$ 33.10	$ 34.41	$ 37.04

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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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- 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).

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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

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

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

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- Definition

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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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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