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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 ($)	Dec. 31, 2012 U.S. Dollar / British Pound [Member] Not Designated as Hedging [Member] USD ($)
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

X

- 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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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration