Derivative Financial Instruments - Notional Amount and Fair Value of Foreign Currency Forward Contarct (Detail) In Thousands, unless otherwise specified	Mar. 31, 2013 Financial Institution Counterparties [Member] CAD	Mar. 31, 2013 Financial Institution Counterparties [Member] EUR (€)	Dec. 31, 2012 Financial Institution Counterparties [Member] EUR (€)	Mar. 31, 2012 Financial Institution Counterparties [Member] EUR (€)	Mar. 31, 2013 Customer Counterparties [Member] CAD
Derivative Counter Party [Line Items]
Forward contracts - assets		€ 1,009	€ 1,093	€ 1,089	19,380
Forward contracts - liabilities	19,432
Forward contracts - assets		3	3	(6)	258
Forward contracts - liabilities	(207)

Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

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

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