Income Taxes - Reconciliation of Effective Tax Rate on Net Income (Loss) from Continuing Operations and Federal Statutory Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 7,905	$ 3,799	$ (1,309)
Stock Compensation		(97)	1,581
Section 199 Deduction	(694)	(454)	(268)
Other permanent items	(272)	7	262
Change in valuation allowance	585	647	214
Interest and penalties on uncertain tax positions			56
State income taxes, net of federal benefit	1,083	314	19
Total tax expense	$ 8,607	$ 4,216	$ 555
Income tax at federal statutory rate	35.00%	35.00%	35.00%
Stock Compensation	0.00%	(0.90%)	(42.30%)
Section 199 Deduction	(3.10%)	(4.20%)	7.20%
Other permanent items	(1.20%)	0.10%	(7.00%)
Change in valuation allowance	2.60%	6.00%	(5.70%)
Interest and penalties on uncertain tax positions	0.00%	0.00%	(1.50%)
State income taxes, net of federal benefit	4.80%	2.90%	(0.50%)
Total tax expense	38.10%	38.90%	(14.80%)