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Impact from Foreign Exchange Derivative Instruments Designated as Cash Flow Hedges (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
(Loss) gain recorded in accumulated other comprehensive loss $ (735) $ 207
Foreign Currency Forward Contracts | Cash Flow Hedge    
Derivative Instruments, Gain (Loss) [Line Items]    
(Loss) gain recorded in accumulated other comprehensive loss (735) 207
(Gain) loss reclassified from accumulated other comprehensive loss into earnings $ (375) $ 1,031