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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, 2018
Dec. 31, 2017
Foreign Exchange Contract | Derivatives not designated as hedging instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Currency exchange losses, net $ 2,428 $ (5,124)