Long-Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2011
Debt Instrument [Line Items]
Revolving Credit facility	$ 750.0
Revolving Credit Facility Agreement	London interbank offered rate ("LIBOR") (as defined in the Amended and Restated Credit Agreement, the "Credit Agreement") plus 225 basis points or Prime (as defined in the Credit Agreement) plus 125 basis points.
Revolving Credit Facility average interest rate	2.50%
Outstanding letter of credit	6.0
Senior Unsecured Notes 6.875 Percent Due 2020
Debt Instrument [Line Items]
Long-term debt	644.6
Senior Unsecured Notes 8.5 Percent Due 2018
Debt Instrument [Line Items]
Long-term debt	$ 600.0
Covenant Requirement \| Minimum
Debt Instrument [Line Items]
Interest coverage ratio	2.25
Covenant Requirement \| Maximum
Debt Instrument [Line Items]
Total leverage ratio	4.25

Debt To EBITDA Ratio

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- Definition

Interest Coverage ratio

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- Definition

Line of Credit, Average Interest Rate

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 2, 4

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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