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Carrying Amount and Estimated Fair Values of Debt (Parenthetical) (Detail) | Sep. 30, 2012 | Dec. 31, 2011
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5.625 % Senior Notes due July 2013 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Debt interest rate | 5.625% | 5.625%
12% Senior Notes due February 2014 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Debt interest rate | 12.00% | 12.00%
7.875% Senior Notes due June 2017 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Debt interest rate | 7.875% | 7.875%
8.125% Senior Notes due 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Debt interest rate | 8.125% | 8.125%
8.375% Senior Notes due 2021 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Debt interest rate | 8.375% | 8.375%
6.875% Senior Notes due July 2033 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [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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