The Fair Value and Line Item Caption of Non-derivative Instruments (Detail) (Non-derivative instruments, USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Carrying Value of Non-derivative instrument Designated as hedging instrument carrying value	$ 656,509	$ 628,172
Foreign Currency Debt \| Long-term Debt
Derivative [Line Items]
Carrying Value of Non-derivative instrument Designated as hedging instrument carrying value	$ 656,509	$ 628,172

Aggregate notional amount of all nonderivative instruments that are designated as hedging instruments in a hedge of the net investment of foreign operations. For example, foreign currency denominated intercompany loans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

Name:	us-gaap_NotionalAmountOfNonderivativeInstrumentsDesignatedAsNetInvestmentHedges
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant