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Income Taxes - Components of Provision for (Benefit from) Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 9,944 $ 18,300 $ 11,123
State and local 3,906 5,595 2,325
Foreign 558 64 140
Total current provision 14,408 23,959 13,588
Deferred:      
Federal (172) (68) 197
State and local (1,382) (539) 141
Foreign (27)    
Total deferred (benefit) provision (1,581) (607) 338
Total provision for income taxes $ 12,827 $ 23,352 $ 13,926