Income Taxes - Income Tax Expense (Benefit) from Continuing Operations, Less Noncontrolling Interest (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 12,798	$ 12,563	$ 18,094
State	2,621	2,371	3,232
Total Current	15,419	14,934	21,326
Deferred:
Federal	(6,273)	6,223	1,389
State	1,798	1,019	133
Total Deferred	(4,475)	7,242	1,522
Total Income Tax Expense	$ 10,944	$ 22,176	$ 22,848