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Derivatives and Hedging Activities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2013 Derivatives not qualified as hedging instruments | Sep. 30, 2012 Derivatives not qualified as hedging instruments | Sep. 30, 2013 Derivatives not qualified as hedging instruments | Sep. 30, 2012 Derivatives not qualified as hedging instruments | Sep. 30, 2013 Derivatives not qualified as hedging instruments Foreign exchange contracts | Dec. 31, 2012 Derivatives not qualified as hedging instruments Foreign exchange contracts | Sep. 30, 2013 Derivatives designated as cash flow hedging instruments | Sep. 30, 2012 Derivatives designated as cash flow hedging instruments | Sep. 30, 2013 Derivatives designated as cash flow hedging instruments | Sep. 30, 2012 Derivatives designated as cash flow hedging instruments | Sep. 30, 2013 Derivatives designated as cash flow hedging instruments Foreign exchange contracts | Dec. 31, 2012 Derivatives designated as cash flow hedging instruments Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional principal amount of Hedging Contracts |  |  |  |  | $ 0 | $ 2,610 |  |  |  |  | $ 1,500 | $ 5,400
Gain (loss) recognized in income, net | $ 0 | $ 5 | $ 112 | $ 17 |  |  | $ 164 | $ 82 | $ 452 | $ 222 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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