Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
U.S. Federal	$ 17,203	$ 7,976	$ 7,494
State	2,049	1,851	2,139
Foreign	1,683	1,645	1,572
Current income tax expense (benefit)	20,935	11,472	11,205
Deferred:
U.S. Federal	4,005	13,201	17,986
State	3,039	1,538	1,927
Foreign	701	(304)	(266)
Deferred income tax expense (benefit)	7,745	14,435	19,647
Total	$ 28,680	$ 25,907	$ 30,852