Income Taxes - Summary of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S. federal	$ 24,311	$ 5,095	$ 1,650
State	5,364	3,176	1,732
Total current income tax provision	29,675	8,271	3,382
Deferred:
U.S. federal	8,255	24,137	27,114
State	8	525	356
Total deferred income tax provision	8,263	24,662	27,470
Total income tax provision	$ 37,938	$ 32,933	$ 30,852