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Summary of Significant Accounting Policies - Other Income (Expense) Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Foreign currency forward contract gain (loss), net $ (7,688) $ (2,917) $ 2,877
Foreign currency transaction gain (loss), net 808 226 (1,611)
Other 9 1,001 199
Other income (expense), net $ (6,871) $ (1,690) $ 1,465