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Schedule of Effect of Derivative Instruments in Statements of Operations Recognized (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other (income) expense, net      
Derivative Instruments, Gain (Loss) [Line Items]      
Foreign exchange contracts derivatives not designated as hedging instruments, Losses Recognized in Statement of Operations $ 8,671 $ 3,047 $ 237