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Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) - Derivatives designated as cash flow hedging instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in other comprehensive income (loss), Effective portion, Net, Total	$ 183	$ 158	$ 177
Gain reclassified from accumulated OCI into income, Effective portion, Net, Total	(189)	(161)	(104)
Foreign exchange option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in other comprehensive income (loss), Effective portion, Net, Total	90	67	83
Gain reclassified from accumulated OCI into income, Effective portion, Net, Total	(90)	(67)	(31)
Foreign exchange forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in other comprehensive income (loss), Effective portion, Net, Total	93	91	94
Gain reclassified from accumulated OCI into income, Effective portion, Net, Total	$ (99)	$ (94)	$ (73)

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+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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