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Income Tax - Income Tax Provision (Benefit) on Income From Operations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal $ 9,110 $ 22,883 $ 41,366
State 4,367 4,666 7,023
Current income tax expense benefit 13,477 27,549 48,389
Deferred (5,069) (33,664) (26,432)
Income tax expense benefit $ 8,408 $ (6,115) $ 21,957