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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
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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Debt instrument, maturity date

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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