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Net (Gains) Losses Reclassified from Accumulated Other Comprehensive Loss (Detail) - Derivatives designated as cash flow hedging instruments - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total | $ (24) | $ 182
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total | 19 | (146)
Foreign exchange option contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total | (19) | 91
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total | 14 | (49)
Foreign exchange forward contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) recognized in other comprehensive income (loss), Effective portion, Net, Total | (5) | 91
Gain (loss) reclassified from accumulated OCI into income, Effective portion, Net, Total | $ 5 | $ (97)

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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 + Details
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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 + Details
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