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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 19,537	$ 20,864	$ 14,676
Stock compensation	(581)	(227)
Qualified Production Activity Deduction	(1,715)	(1,776)	(1,347)
Other permanent items	197	(92)	(69)
Change in valuation allowance	285	442	467
Change in uncertain tax positions	(1,807)	66	(559)
State income taxes, net of federal benefit	2,150	1,897	2,245
Rate impact of the Tax Act	(3,386)
Total tax expense	$ 14,680	$ 21,174	$ 15,413
Income tax at federal statutory rate	35.00%	35.00%	35.00%
Stock compensation	(1.00%)	(0.40%)	(0.00%)
Qualified Production Activity Deduction	(3.10%)	(3.00%)	(3.20%)
Other permanent items	0.40%	(0.10%)	(0.20%)
Change in valuation allowance	0.50%	0.70%	1.10%
Change in uncertain tax positions	(3.20%)	0.10%	(1.30%)
State income taxes, net of federal benefit	3.80%	3.20%	5.40%
Rate impact of the Tax Act	(6.10%)
Total tax expense	26.30%	35.50%	36.80%

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