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Subsequent Events - Additional Information (Details) (USD $) |  |  |  |  |  | 1 Months Ended |  | 12 Months Ended | 1 Months Ended
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Dec. 31, 2012 9.875% Senior Notes due 2016 | Dec. 31, 2011 9.875% Senior Notes due 2016 | Dec. 31, 2012 8.0% Senior Notes due 2018 | Dec. 31, 2011 8.0% Senior Notes due 2018 | Jan. 31, 2013 Royalty Trust Distributions Royalty Trusts | Feb. 28, 2013 Permian Properties | Dec. 31, 2012 Permian Properties | Dec. 31, 2012 Redemption of Senior Notes | Dec. 31, 2012 Redemption of Senior Notes 9.875% Senior Notes due 2016 | Dec. 31, 2012 Redemption of Senior Notes 8.0% Senior Notes due 2018 | Dec. 31, 2011 Derivative Contracts Early Settlements Commodity Derivatives | Feb. 28, 2013 Derivative Contracts Early Settlements Commodity Derivatives Permian Properties
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expected distribution date |  |  |  |  | 3/1/2013 |  |  |  |  |  |  |
Distributions record date |  |  |  |  | 2/14/2013 |  |  |  |  |  |  |
Proceeds from sale of oil and natural gas properties |  |  |  |  |  | $ 2,600,000,000 |  |  |  |  |  |
Pro forma loss on sale of oil and natural gas properties |  |  |  |  |  |  | 450,000,000 |  |  |  |  |
Realized loss on derivatives |  |  |  |  |  |  |  |  |  |  | 62,900,000 | 30,000,000
Long-term debt, fixed interest rate | 9.875% | 9.875% | 8.00% | 8.00% |  |  |  |  | 9.875% | 8.00% |  |
Aggregate principal outstanding |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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