Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current provision (benefit), federal	$ (4)	$ (153)	$ 26
Deferred provision (benefit), federal	(1,801)	6,077	4,799
Total provision (benefit), federal	(1,805)	5,924	4,825
Current provision (benefit), state and local	(27)	380	316
Deferred provision (benefit), state and local	1,021	389	2,834
Total provision (benefit), state and local	994	769	3,150
Current provision (benefit), foreign	2,605	1,374	1,512
Deferred provision (benefit), foreign	(1,745)	1,691	(4,356)
Total provision (benefit), foreign	860	3,065	(2,844)
Current provision (benefit)	2,574	1,601	1,854
Deferred provision (benefit)	(2,525)	8,157	3,277
Provision for income taxes	$ 49	$ 9,758	$ 5,131