Income Taxes - Significant Components of the Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 13,594	$ 7,793	$ 7,963
State	996	800	987
Total current	14,590	8,593	8,950
Deferred:
Federal	288	2,656	764
State	984	942	(143)
Foreign	(278)	0	0
Total deferred	994	3,598	621
Tax provision recorded as an increase in liability for unrecorded tax benefits	(156)	202	219
Provision for income taxes	$ 15,428	$ 12,393	$ 9,790