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Income Taxes - Summary of Components of Income Tax Provision (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal, Current									$ (16,610)	$ 63,697	$ 65,403
Federal, Deferred									28,719	(45,660)	(29,667)
Federal income tax provision, Total									12,109	18,037	35,736
State, Current									(2,954)	8,561	15,185
State, Deferred									7,573	(10,022)	(6,227)
State income tax provision, Total									4,619	(1,461)	8,958
Income tax provision, Total	$ 5,869	$ 6,677	$ 3,097	$ 1,085	$ 3,986	$ 7,360	$ 6,744	$ (1,514)	$ 16,728	$ 16,576	$ 44,694

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