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Income Taxes - Components of Provision for Income Tax Expense (Benefit) (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
Current provision:
Federal									$ 102,516	$ 248,191	$ 228,505
State									32,638	13,092	24,336
Total current provision									135,154	261,283	252,841
Deferred (benefit)/provision:
Federal									(57,076)	(58,124)	(89,518)
State									(6,225)	(628)	786
Total deferred benefit									(63,301)	(58,752)	(88,732)
Provision for income tax expense	$ 44,449	$ (53,667)	$ 40,074	$ 40,997	$ 66,190	$ 40,617	$ 44,713	$ 51,011	$ 71,853	$ 202,531	$ 164,109

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