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Impact from Foreign Exchange Derivative Instruments Designated as Cash Flow Hedges (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recorded in accumulated other comprehensive loss $ 520 $ 304 $ 727 $ (119)
Loss (gain) reclassified from accumulated other comprehensive loss into earnings 144 (937) 1,175 (1,180)
Foreign Currency Forward Contracts | Cash Flow Hedge        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recorded in accumulated other comprehensive loss 520 304 727 (119)
Loss (gain) reclassified from accumulated other comprehensive loss into earnings $ 144 $ (937) $ 1,175 $ (1,180)