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Net (Gains) Losses Reclassified from Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	$ 21	$ (2)	$ (259)	$ 180
Derivatives designated as cash flow hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	21	(2)	(259)	180
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	63	2	259	(186)
Derivatives designated as cash flow hedging instruments | Foreign exchange option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	(2)	1	(128)	88
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	20	(1)	117	(88)
Derivatives designated as cash flow hedging instruments | Foreign exchange forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total	23	(3)	(131)	92
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total	$ 43	$ 3	$ 142	$ (98)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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-Publisher FASB
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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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