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Income Taxes - Components of Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Federal - Current $ (420) $ 0 $ (9)
State - Current 0 0 0
Total current income tax expense (420) 0 (9)
Federal - Deferred (199,370) (117,781) (11,667)
State - Deferred (3,514) (10,757) (4,447)
Total deferred income tax expense (202,884) (128,538) (16,114)
Annual effective tax benefit $ (203,304) $ (128,538) $ (16,123)