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Long-Term Debt - Additional Information (Details) (USD $) | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Senior credit facility | Mar. 31, 2014 Senior credit facility Minimum | Mar. 31, 2014 Senior credit facility Maximum | Mar. 31, 2014 Senior credit facility Addition to LIBOR per annum LIBOR Minimum | Mar. 31, 2014 Senior credit facility Addition to LIBOR per annum LIBOR Maximum | Mar. 31, 2014 Senior credit facility Addition to federal funds rate | Mar. 31, 2014 Senior credit facility Addition to Eurodollar rate per annum Euro Dollar Rate | Mar. 31, 2014 Senior credit facility Applicable margin to base rate per annum Minimum | Mar. 31, 2014 Senior credit facility Applicable margin to base rate per annum Maximum | Mar. 31, 2014 Senior Notes Outstanding | Mar. 31, 2013 9.875% Senior Notes due 2016 | Mar. 31, 2013 8.0% Senior Notes due 2018 | Mar. 31, 2013 9.875% Senior Notes and 8.0% Senior Notes | Mar. 31, 2014 Senior Notes | Apr. 30, 2014 Subsequent Event Senior credit facility
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, debt to EBITDA, ratio maximum |  |  |  |  | 4.5 |  |  |  |  |  |  |  |  |  |  |  |
Current assets to current liabilities, ratio minimum |  |  |  | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, debt to EBITDA ratio, total funded debt determination |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity date |  |  | March 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, financial covenants compliance |  |  | As of and during the three month period ended March 31, 2014, the Company was in compliance with all applicable financial covenants under the senior credit facility. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, guarantee |  |  | The obligations under the senior credit facility are guaranteed by certain Company subsidiaries and are secured by first priority liens on all shares of capital stock of certain of the Company’s material present and future subsidiaries; certain intercompany debt of the Company; and substantially all of the Company’s assets, including proved oil and natural gas reserves representing at least 80.0% of the discounted present value (as defined in the senior credit facility) of proved oil and natural gas reserves considered by the lenders in determining the borrowing base for the senior credit facility. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate determination reference |  |  | (a) LIBOR plus an applicable margin between 1.75% and 2.75% per annum or (b) the “base rate,” which is the highest of (i) the federal funds rate plus 0.5%, (ii) the prime rate published by Bank of America or (iii) the Eurodollar rate (as defined in the senior credit facility) plus 1.00% per annum, plus, in each case under scenario (b), an applicable margin between 0.75% and 1.75% per annum. Interest is payable quarterly for base rate loans and at the applicable maturity date for LIBOR loans, except that if the interest period for a LIBOR loan is six months, interest is paid at the end of each three-month period. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, basis spread on variable rate |  |  |  |  |  | 1.75% | 2.75% | 0.50% | 1.00% | 0.75% | 1.75% |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowings capacity |  |  | 775,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 775,000,000
Line of credit facility, amount outstanding |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credity facility, letters of credit outstanding |  |  | 29,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  |  |  | 70,200,000 |  |  |  |  |
Debt tender offer, aggregate principal amount tendered |  |  |  |  |  |  |  |  |  |  |  |  | 365,500,000 | 750,000,000 |  |  |
Debt instrument redemption price per principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 1,061.34 | 1,052.77 |  |  |
Loss on extinguishment of debt | $ 0 | $ 82,005,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 82,005,000 |  |
Debt instrument, restrictive covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Each of the indentures governing the Company’s Senior Fixed Rate Notes contains covenants that restrict the Company’s ability to take a variety of actions, including limitations on the incurrence of indebtedness, payment of dividends, investments, asset sales, certain asset purchases, transactions with related parties and consolidations or mergers. |
Debt instrument, covenant compliance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | As of and during the three month period ended March 31, 2014, the Company was in compliance with all of the covenants contained in the indentures governing its senior notes. |

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