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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current tax provision:      
U.S. Federal $ (44,177) $ (15,089) $ 6,740
State and other (3,378) (1,520) (418)
Total (47,555) (16,609) 6,322
Deferred tax provision:      
U.S. Federal 1,678 1,382 (38,262)
State and other 57 (75) (3,191)
Total 1,735 1,307 (41,453)
Income tax expense $ (45,820) $ (15,302) $ (35,131)