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Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
U.S. federal $ 51 $ 0 $ 0
U.S. state 0 0 0
Non-U.S. 0 0 0
Total current 51 0 0
Deferred      
U.S. federal 244,801 (43,814) 109,512
U.S. state 15,398 (4,311) (29,394)
Non-U.S. 0 0 0
Total deferred 260,199 (48,125) 80,118
Valuation allowance (260,199) 48,125 (80,118)
Total $ 51 $ 0 $ 0