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Income Taxes - Schedule of Components of Income Tax Provision (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal $ 21,330 $ 29,071 $ 19,879
State 298 274 154
Total current tax provision 21,628 29,345 20,033
Deferred State and Local Income Tax Expense (Benefit) 3,666 19,237 5,846
Deferred State and Local Income Tax Expense (Benefit) (20) (21) (240)
Deferred Income Tax Expense (Benefit) 3,646 19,216 5,606
Total tax provision (benefit), Amount $ 25,274 $ 48,561 $ 25,639