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Income Taxes - Schedule of Components of Income Tax Provision (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Federal $ 29,071 $ 19,879 $ 8,610
State 274 154 68
Total current tax provision 29,345 20,033 8,678
Deferred State and Local Income Tax Expense (Benefit) 19,237 5,846 12,158
Deferred State and Local Income Tax Expense (Benefit) (21) (240) 0
Deferred Income Tax Expense (Benefit) 19,216 5,606 12,158
Total tax provision (benefit), Amount $ 48,561 $ 25,639 $ 20,836