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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 15,159	$ 19,537	$ 20,864
Stock compensation	(436)	(581)	(227)
Qualified Production Activity Deduction		(1,715)	(1,776)
Other permanent items	(667)	197	(92)
Change in valuation allowance	312	285	442
Change in uncertain tax positions	969	(1,807)	66
State income taxes, net of federal benefit	2,911	2,150	1,897
Rate impact of the Tax Act	(810)	(3,386)
Total tax expense	$ 17,438	$ 14,680	$ 21,174
Income tax at federal statutory rate	21.00%	35.00%	35.00%
Stock compensation	(0.60%)	(1.00%)	(0.40%)
Qualified Production Activity Deduction	(0.00%)	(3.10%)	(3.00%)
Other permanent items	(0.80%)	0.40%	(0.10%)
Change in valuation allowance	0.40%	0.50%	0.70%
Change in uncertain tax positions	1.30%	(3.20%)	0.10%
State income taxes, net of federal benefit	4.00%	3.80%	3.20%
Rate impact of the Tax Act	(1.10%)	(6.10%)
Total tax expense	24.20%	26.30%	35.50%

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