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Summary of PSU Activity of the Incentive Plan (Detail) - Performance Share Units - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Number of Shares, beginning balance	717,677	453,748	150,980
Granted	202,145	263,929	302,768
Change in awards based on performance	75,488
Vested	(113,234)
Number of Shares, ending balance	882,076	717,677	453,748
Weighted Average Grant Date Fair Value Per Share
Weighted average fair value, Balance at beginning of period	$ 7.52	$ 7.04	$ 7.12
Granted	11.77	8.35	7.00
Change in awards based on performance	7.12	0.00	0.00
Vested	7.12	0.00	0.00
Weighted average fair value, Balance at end of period	$ 8.21	$ 7.52	$ 7.04

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options change in awards based on performance in period.

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Share based compensation arrangement by share based payment award equity instruments other than options change in awards based on performance in period weighted average grant date fair value.

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

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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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