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Summary of Status of Restricted Stock Units and Changes (Detail) - Restricted Stock Units - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Nonvested Stock Units
Nonvested at beginning period	1,643	1,621	1,538
Restricted stock units granted	1,692	1,584	1,622
Restricted stock units vested	(1,564)	(1,505)	(1,517)
Restricted stock units forfeited	(57)	(57)	(22)
Nonvested at ending period	1,714	1,643	1,621	1,538
Weighted Average Grant Date Fair Value
Nonvested at beginning period	$ 8.08	$ 13.85	$ 10.36
Restricted stock units granted	9.40	8.01	13.86
Restricted stock units vested	8.02	14.12	9.79
Restricted stock units forfeited	9.31	9.59	11.75
Nonvested at ending period	$ 9.37	$ 8.08	$ 13.85	$ 10.36
Weighted Average Remaining Recognition Period (Years)
Nonvested at ending period	3 months 21 days	3 months 14 days	4 months 17 days	3 months 29 days

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

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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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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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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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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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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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Weighted average remaining contractual term for equity-based awards excluding options, 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 equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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