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Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 (43,814) 109,512 57,873
U.S. state (4,311) (29,394) 7,631
Non-U.S. 0 0 0
Total deferred (48,125) 80,118 65,504
Valuation allowance 48,125 (80,118) (65,504)
Total $ 0 $ 0 $ 0