Foreign Currency Derivatives - Additional Information (Detail) (USD $)	9 Months Ended
Sep. 30, 2013 M
Derivative [Line Items]
Maximum duration of foreign exchange forward contracts designated as cash flow hedges, months	13
Original Maturities of 360 Days or Less
Derivative [Line Items]
Cash flow hedge contracts	$ 0

Fair value as of the balance sheet date of all foreign currency 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 (a),(b),(c)(1)

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

Name:	us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant