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Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail) (Forward Foreign Currency Exchange Contracts [Member]) In Thousands, unless otherwise specified | Sep. 30, 2013 Euro / U.S. Dollar [Member] Not Designated as Hedging [Member] EUR (€) | Dec. 31, 2012 Euro / U.S. Dollar [Member] Not Designated as Hedging [Member] EUR (€) | Sep. 30, 2013 Euro / U.S. Dollar [Member] Designated as Hedging [Member] EUR (€) | Dec. 31, 2012 Euro / U.S. Dollar [Member] Designated as Hedging [Member] EUR (€) | Sep. 30, 2013 Euro / British Pound [Member] Not Designated as Hedging [Member] EUR (€) | Dec. 31, 2012 Euro / British Pound [Member] Not Designated as Hedging [Member] EUR (€) | Sep. 30, 2013 Euro / British Pound [Member] Not Designated as Hedging [Member] EUR (€) | Dec. 31, 2012 Euro / British Pound [Member] Not Designated as Hedging [Member] EUR (€) | Sep. 30, 2013 U.S. Dollar / Canadian Dollar [Member] Not Designated as Hedging [Member] CAD | Dec. 31, 2012 U.S. Dollar / Canadian Dollar [Member] Not Designated as Hedging [Member] CAD | Sep. 30, 2013 U.S. Dollar / Canadian Dollar [Member] Designated as Hedging [Member] EUR (€) | Dec. 31, 2012 U.S. Dollar / Canadian Dollar [Member] Designated as Hedging [Member] EUR (€) | Sep. 30, 2013 U.S Dollar / Euro [Member] Not Designated as Hedging [Member] USD ($) | Dec. 31, 2012 U.S Dollar / Euro [Member] Not Designated as Hedging [Member] USD ($) | Sep. 30, 2013 U.S. Dollar / British Pound [Member] Not Designated as Hedging [Member] USD ($) | Dec. 31, 2012 U.S. Dollar / British Pound [Member] Not Designated as Hedging [Member] USD ($)
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buy Notional | € 18,000 | € 13,000 | € 25,275 | € 27,003 | € (8,000) | € 4,000 | € 5,000 |  | 2,000 | 2,000 | € 13,317 | € 12,369 | $ 6,000 | $ 2,000 | $ 6,000 |

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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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- Details
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