Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 151,532	$ 115,610	$ 126,358
State	42,769	34,586	37,038
Deferred:
Federal	(13,289)	(2,195)	138
State	(4,227)	(745)	(999)
Total	$ 176,785	$ 147,256	$ 162,535