Income Taxes - Significant Components of the Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 16,346	$ 13,594	$ 7,793
State	1,534	996	800
Foreign	1,050	0	0
Total current	18,930	14,590	8,593
Deferred:
Federal	(4,145)	288	2,656
State	(977)	984	942
Foreign	(45)	(278)	0
Total deferred	(5,167)	994	3,598
Tax provision recorded as an increase (decrease) in liability for unrecorded tax benefits	437	(156)	202
Provision for income taxes	$ 14,200	$ 15,428	$ 12,393