Income Taxes - Components of Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
U.S. federal	$ (12)	$ 546	$ 30
U.S. state and local taxes	172	224	58
Total current	160	770	88
Deferred:
U.S. federal	(28,378)	1,512	(35,672)
U.S. state and local taxes	(5,322)	1,017	(1,877)
Foreign	0	63	(63)
Total deferred	(33,700)	2,592	(37,612)
Total income tax (benefit) expense	$ (33,540)	$ 3,362	$ (37,524)