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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Apr. 30, 2012
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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 | 5,420 | 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 | 4,027 | 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% | 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 | $ 3,823 | $ 4,029 |

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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 Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The amount of debt premium 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 Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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