Income Taxes - Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax provision:
Federal	$ 30,306	$ 33,578	$ 41,177
State	6,952	7,674	5,420
Total	37,258	41,252	46,597
Deferred income tax provision:
Federal	6,928	988	1,177
State	778	49	(983)
Total	7,706	1,037	194
Total income tax provision	$ 44,964	$ 42,289	$ 46,791