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Income Tax - Components of Income Tax Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Current tax provision (benefit) $ 4,923 $ (301) $ 13,083 $ 7,586
Deferred tax benefit (1,621) (4,539) (2,734) (6,338)
Income tax expense (benefit) $ 3,302 $ (4,840) $ 10,349 $ 1,248