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Income Taxes - Reconciliation of Effective Tax Rate on Net Income (Loss) and Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 19,447	$ 15,159	$ 19,537
Stock compensation	(255)	(436)	(581)
Qualified Production Activity Deduction			(1,715)
Other permanent items	737	(667)	197
Change in valuation allowance	276	312	285
Change in uncertain tax positions	67	969	(1,807)
State income taxes, net of federal benefit	4,174	2,911	2,150
Rate impact of the Tax Act		(810)	(3,386)
Total tax expense	$ 24,446	$ 17,438	$ 14,680
Income tax at federal statutory rate	21.00%	21.00%	35.00%
Stock compensation	(0.30%)	(0.60%)	(1.00%)
Qualified Production Activity Deduction	(0.00%)	(0.00%)	(3.10%)
Other permanent items	0.80%	(0.80%)	0.40%
Change in valuation allowance	0.30%	0.40%	0.50%
Change in uncertain tax positions	0.10%	1.30%	(3.20%)
State income taxes, net of federal benefit	4.50%	4.00%	3.80%
Rate impact of the Tax Act	0.00%	(1.10%)	(6.10%)
Total tax expense	26.40%	24.20%	26.30%

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