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Provision for Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]        
Expected tax expense, at the U.S. federal statutory income tax rate of 35%     $ 3,480 $ 2,500
Domestic production activities deduction     (298) (218)
State income taxes     269 208
Other, net     38 15
Total income tax expense $ 1,780 $ 1,320 $ 3,489 $ 2,505