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Income Taxes - Benefit for Income Taxes from Continuing Operations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 67 $ 46 $ (4,655)
State (381) 11 (429)
Total Current (314) 57 (5,084)
Deferred:      
Federal (50,084) (46,926) (25,958)
State 9,639 4,913 (1,478)
Total Deferred (40,445) (42,013) (27,436)
Benefit for income taxes $ (40,759) $ (41,956) $ (32,520)