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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal, Current									$ 97,754	$ 130,053	$ 166,758
Federal, Deferred									(20,176)	(63,038)	15,596
Federal income tax provision, Total									77,578	67,015	182,354
State, Current									26,605	20,070	4,296
State, Deferred									(3,973)	2,965	2,553
State income tax provision, Total									22,632	23,035	6,849
Income tax provision, Total	$ 21,156	$ 24,873	$ 30,122	$ 24,059	$ (27,761)	$ 42,119	$ 40,725	$ 34,967	$ 100,210	$ 90,050	$ 189,203

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