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Provision for Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Expected tax expense, at the U.S. federal statutory income tax rate of 35% in 2017 and 21% in 2018     $ 2,430 $ 3,480
Domestic production activities deduction       (298)
State income taxes     396 269
Other, net     20 38
Total income tax expense $ 1,627 $ 1,780 $ 2,846 $ 3,489