Income Taxes - Provision (Benefit) for Income Tax Attributable to Income (Loss) from Continuing Operations before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 38,782	$ 70,098	$ 95,814
State	7,253	10,941	8,961
Total current taxes	46,035	81,039	104,775
Deferred:
Federal	9,698	(350)	37,151
State	8,167	9,863	10,341
Total deferred taxes	17,865	9,513	47,492
Total income tax expense	$ 63,900	$ 90,552	$ 152,267