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Fair Values of Financial Instruments - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt interest rate	4.97%	4.97%
Current market rates used in measuring fair value	3.24%	4.07%
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt interest rate	4.27%
Current market rates used in measuring fair value	3.59%

X

- Definition

Minimum Percentage of Fair Value Transactions Corroborated Using Observable Market Inputs Required for Level Two

+ References

No definition available.

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X

- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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