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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Parenthetical) (Detail) | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012
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12% Senior Notes due February 2014 [Member] |  |  |
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items] |  |  |
Debt interest rate | 12.00% | 12.00% | 12.00%
7.875% Senior Notes due June 2017 [Member] |  |  |
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items] |  |  |
Debt interest rate | 7.875% | 7.875% |
8.125% Senior Notes due September 2019 [Member] |  |  |
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items] |  |  |
Debt interest rate | 8.125% | 8.125% |
6.50% Senior Notes due December 2020 [Member] |  |  |
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items] |  |  |
Debt interest rate | 6.50% | 6.50% |
8.375% Senior Notes due September 2021 [Member] |  |  |
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items] |  |  |
Debt interest rate | 8.375% | 8.375% |
5.25% Senior Notes due April 2023 [Member] |  |  |
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items] |  |  |
Debt interest rate | 5.25% | 5.25% |
6.875% Senior Notes due July 2033 [Member] |  |  |
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items] |  |  |
Debt interest rate | 6.875% | 6.875% |

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- 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 + Details
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