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Derivative Financial Instruments - Income Statement Location And Impact Of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Foreign Exchange Contract | Derivatives not designated as hedging instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Currency exchange (gains) losses, net $ (5,124) $ 6,675