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Summary of Significant Accounting Policies - Other Income (Expense) Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]      
Foreign currency exchange contract gains/(losses), net $ 2,877 $ 6,356 $ 6,764
Foreign currency transaction gains/(losses), net (1,611) (6,198) (821)
Other 199 (206) 62
Other income (expense), net $ 1,465 $ (48) $ 6,005