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Certain Balance Sheet Accounts - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Payroll and related benefits $ 34,809 $ 28,681
Taxes 3,912 4,704
Other 10,908 8,018
Total $ 49,629 $ 41,403