Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
U.S. federal	$ 0	$ 0	$ 0
U.S. state	0	0	0
Non-U.S.	0	0	0
Total current	0	0	0
Deferred
U.S. federal	109,512	57,873	59,379
U.S. state	(29,394)	7,631	7,470
Non-U.S.	0	0	0
Valuation Allowance	(80,118)	(65,504)	(66,849)
Total deferred	0	0	0
Total	$ 0	$ 0	$ 0