Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 115,610	$ 126,358	$ 211,641
State	34,586	37,038	37,006
Deferred:
Federal	(2,195)	138	60,785
State	(745)	(999)	(42)
Total	$ 147,256	$ 162,535	$ 309,390