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Share-based Compensation - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares shares in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested units at January 1, 2021				124
Granted (target)				45
Achieved performance adjustment	[1]			2
Vested				(42)
Non-vested units at September 30, 2021		129		129
Weighted Average Grant Date Fair Value, Non-vested units at January 1, 2020				$ 21.89
Weighted Average Grant Date Fair Value, Granted (target)		$ 0	$ 0	30.22	$ 15.86
Weighted Average Grant Date Fair Value, Achieved performance adjustment	[1]			28.25
Weighted Average Grant Date Fair Value, Vested				28.25
Weighted Average Grant Date Fair Value Non-vested units at September 30, 2020		$ 22.84		$ 22.84
[1] The 2018 LTIP RSUs were earned and vested at 105.6% of target, as described in greater detail in the Company’s definitive proxy statement filed with the SEC on April 16, 2021.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards increased or decreased 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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