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Estimated Fair Value of Outstanding Debt Balances (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	$ 600,000	$ 502,500
Carrying (Reported) Amount, Fair Value Disclosure | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt		110,000
Carrying (Reported) Amount, Fair Value Disclosure | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt		92,500
Carrying (Reported) Amount, Fair Value Disclosure | Series A Senior Notes, 4.97 Percent
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	300,000	300,000
Carrying (Reported) Amount, Fair Value Disclosure | Series B Senior Notes, 4.27 Percent
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	300,000
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	646,993	518,442
Estimate of Fair Value, Fair Value Disclosure | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt		110,000
Estimate of Fair Value, Fair Value Disclosure | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt		92,500
Estimate of Fair Value, Fair Value Disclosure | Series A Senior Notes, 4.97 Percent
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	336,548	315,942
Estimate of Fair Value, Fair Value Disclosure | Series B Senior Notes, 4.27 Percent
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of Debt	$ 310,445

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

+ Details

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

X

- Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration