Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 24,509	$ 20,947	$ 8,073
State	8,132	6,260	7,610
Foreign	338	480	426
Total current	32,979	27,687	16,109
Deferred:
Federal	800	(1,534)	1,056
State	516	(2,301)	3,556
Total deferred	1,316	(3,835)	4,612
Total income tax expense	$ 34,295	$ 23,852	$ 20,721