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Long-Term Debt - Additional Information (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended
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.