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Income Taxes - Components of Income Tax Provision (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current provision:      
Federal $ (72) $ 8,576 $ 15,546
State 453 1,270 2,825
Deferred provision:      
Federal 4,144 (2,421) (1,393)
State (472) (277) (159)
Total income tax provision $ 4,053 $ 7,148 $ 16,819