Income Taxes - Reconciliation of Effective Tax Rate on Net Income (Loss) from Continuing Operations and Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 20,864	$ 14,676	$ 7,905
Stock compensation	(227)
Qualified Production Activity Deduction	(1,776)	(1,347)	(694)
Other permanent items	(92)	(69)	(272)
Change in valuation allowance	442	467	585
Change in uncertain tax positions	66	(559)
State income taxes, net of federal benefit	1,897	2,245	1,083
Total tax expense	$ 21,174	$ 15,413	$ 8,607
Income tax at federal statutory rate	35.00%	35.00%	35.00%
Stock compensation	(0.40%)	(0.00%)	(0.00%)
Qualified Production Activity Deduction	(3.00%)	(3.20%)	(3.10%)
Other permanent items	(0.10%)	(0.20%)	(1.20%)
Change in valuation allowance	0.70%	1.10%	2.60%
Change in uncertain tax positions	0.10%	(1.30%)	0.00%
State income taxes, net of federal benefit	3.20%	5.40%	4.80%
Total tax expense	35.50%	36.80%	38.10%