Derivative Financial Instruments - Fair Values of our Derivative Financial Instruments (Detail) (FOREX contracts [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities designated as hedging instruments, current	$ (4,304)	$ (29)
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets designated as hedging instruments, current	$ 3,272	$ 3,627

Fair value of all liability derivatives designated as cash flow hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant