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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Total net derivative contracts | $ 83,082 | $ 19,992
9.875% Senior Notes due 2016 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 9.875% | 9.875%
Debt maturity date | 2016 | 2016
Long-term debt, discount | 0 | 8,843
8.0% Senior Notes due 2018 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 8.00% | 8.00%
Debt maturity date | 2018 | 2018
8.75% Senior Notes due 2020 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 8.75% | 8.75%
Debt maturity date | 2020 | 2020
Long-term debt, discount | 5,575 | 5,873
7.5% Senior Notes due 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 7.50% | 7.50%
Debt maturity date | 2021 | 2021
Long term debt, premium | 4,128 | 4,328
8.125% Senior Notes due 2022 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 8.125% | 8.125%
Debt maturity date | 2022 | 2022
7.5% Senior Notes due 2023 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Long-term debt, fixed interest rate | 7.50% | 7.50%
Debt maturity date | 2023 | 2023
Long-term debt, discount | 3,893 | 4,029
Fair Value Measurements Level 3 | Oil Basis Swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Total net derivative contracts | $ 0 | $ (512)

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 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FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. + Details
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