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Long-Term Debt - Additional Information (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Senior credit facility
Jun. 30, 2014
Senior credit facility
Apr. 30, 2014
Senior credit facility
Jun. 30, 2014
Senior credit facility
Minimum
Jun. 30, 2014
Senior credit facility
Maximum
Jun. 30, 2014
Senior credit facility
Addition to LIBOR per annum
LIBOR
Minimum
Jun. 30, 2014
Senior credit facility
Addition to LIBOR per annum
LIBOR
Maximum
Jun. 30, 2014
Senior credit facility
Addition to federal funds rate
Jun. 30, 2014
Senior credit facility
Addition to Eurodollar rate per annum
Euro Dollar Rate
Jun. 30, 2014
Senior credit facility
Applicable margin to base rate per annum
Minimum
Jun. 30, 2014
Senior credit facility
Applicable margin to base rate per annum
Maximum
Jun. 30, 2014
Senior Notes Outstanding
Mar. 31, 2013
9.875% Senior Notes due 2016
Mar. 31, 2013
8.0% Senior Notes due 2018
Jun. 30, 2013
9.875% Senior Notes and 8.0% Senior Notes
Jun. 30, 2014
Senior Notes
Jun. 30, 2014
Senior Notes
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 $ 10,000,000                              
Debt maturity date           March 2017                              
Line of credit facility, financial covenants compliance         As of and during the three and six-month periods ended June 30, 2014, the Company was in compliance with all applicable financial covenants under the senior credit facility. As of and during the three and six-month periods ended June 30, 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, natural gas and NGL reserves representing at least 80.0% of the discounted present value (as defined in the senior credit facility) of proved oil, natural gas and NGL 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% 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         775,000,000 775,000,000 775,000,000                            
Line of credit facility, amount outstanding         0 0                              
Line of credity facility, letters of credit outstanding         10,400,000 10,400,000                              
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 $ 0 $ 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 and six-month periods ended June 30, 2014, the Company was in compliance with all of the covenants contained in the indentures governing its Senior Fixed Rate Notes. As of and during the three and six-month periods ended June 30, 2014, the Company was in compliance with all of the covenants contained in the indentures governing its outstanding Senior Fixed Rate Notes.