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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Provision for current income taxes      
Federal $ 11,308 $ 1,330  
State 2,292 388 $ 275
Total provision for current income taxes 13,600 1,718 275
Provision for deferred income taxes, net      
Federal (1,109) 2,114 347
State 89 161 170
Total provision for deferred income taxes, net (1,020) 2,275 517
Total provision for income taxes $ 12,580 $ 3,993 $ 792