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Long-Term Debt - Additional Information (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Senior credit facility
Dec. 31, 2012
Senior credit facility
Dec. 31, 2011
Senior credit facility
Oct. 31, 2013
Senior credit facility
Aug. 31, 2012
Senior credit facility
Dec. 31, 2013
Senior credit facility
Minimum
Dec. 31, 2013
Senior credit facility
Maximum
Dec. 31, 2013
Senior Notes
Dec. 31, 2013
Senior Notes Outstanding
Dec. 31, 2013
8.0% Senior Notes due 2018
Mar. 31, 2013
8.0% Senior Notes due 2018
Dec. 31, 2012
8.0% Senior Notes due 2018
Dec. 31, 2013
9.875% Senior Notes due 2016
Mar. 31, 2013
9.875% Senior Notes due 2016
Dec. 31, 2012
9.875% Senior Notes due 2016
Dec. 31, 2013
9.875% Senior Notes due 2016 and 8.0% Senior Notes due 2018
Dec. 31, 2013
8.125% Senior Notes due 2022
Dec. 31, 2012
8.125% Senior Notes due 2022
Dec. 31, 2013
7.5% Senior Notes due 2023
Dec. 31, 2012
7.5% Senior Notes due 2023
Dec. 31, 2013
7.5% Senior Notes due 2021
Dec. 31, 2012
7.5% Senior Notes due 2021
Mar. 31, 2011
7.5% Senior Notes due 2021
Dec. 31, 2011
8.625% Senior Notes Due 2015
Sep. 30, 2012
Senior Floating Rate Notes due 2014
Dec. 31, 2012
Senior Floating Rate Notes due 2014
Aug. 31, 2012
2012 Activity
2012 Senior Notes
Dec. 31, 2012
2012 Activity
2012 Senior Notes
Apr. 30, 2012
2012 Activity
8.125% Senior Notes due 2022
Aug. 31, 2012
2012 Activity
7.5% Senior Notes due 2023
Dec. 31, 2013
2012 Activity
7.5% Senior Notes due 2023
Aug. 31, 2012
2012 Activity
7.5% Senior Notes due 2021
Dec. 31, 2013
2012 Activity
7.5% Senior Notes due 2021
Dec. 31, 2011
2011 Activity
8.625% Senior Notes Due 2015
Dec. 31, 2013
Addition to LIBOR per annum
Senior credit facility
LIBOR
Minimum
Dec. 31, 2013
Addition to LIBOR per annum
Senior credit facility
LIBOR
Maximum
Dec. 31, 2013
Addition to federal funds rate
Senior credit facility
Dec. 31, 2013
Addition to Eurodollar rate per annum
Senior credit facility
Eurodollar Rate
Dec. 31, 2013
Applicable margin to base rate per annum
Senior credit facility
Minimum
Dec. 31, 2013
Applicable margin to base rate per annum
Senior credit facility
Maximum
Aug. 31, 2012
Prior to additional debt issuance
Senior credit facility
Debt Instrument [Line Items]                                                                                        
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                 2018   2018 2016   2016   2022 2022 2023 2023 2021 2021                                      
Line of credit facility, financial covenants compliance       As of and during the year ended December 31, 2013, the Company was in compliance with all applicable financial covenants under the senior credit facility.                                                                                
Line of credit facility, collateral       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, 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                                                       3.625%                   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, increase (decrease), net       0 0                                                                              
Line of credit facility, average annual interest rates           2.69%                                                                            
Line of credit facility maximum borrowings capacity             775,000,000 775,000,000                                                                       1,000,000,000
Line of credit facility, amount outstanding       0                                                                                
Line of credit facility, letters of credit outstanding       29,100,000                                                                                
Debt issuance cost, cumulative                       70,200,000                                     41,000,000                          
Debt instrument, covenant compliance                     As of and during the year ended December 31, 2013, the Company was in compliance with all of the covenants contained in the indentures governing its outstanding Senior Fixed Rate Notes.                                                                  
Debt instrument issuance date, month and year                                                               April 2012   August 2012                    
Debt instrument, face amount                                                   900,000,000           750,000,000   825,000,000   275,000,000                
Long-term debt, fixed interest rate                         8.00%   8.00% 9.875%   9.875%   8.125% 8.125% 7.50% 7.50% 7.50% 7.50%                       8.625%              
Debt tender offer, aggregate principal amount tendered                                                                         650,000,000              
Proceeds from debt, net of issuance costs                                                           1,100,000,000   730,100,000                        
Premium paid to purchase notes and unamortized debt issuance cost in relation to the notes (82,005,000) (3,075,000) (38,232,000)                               (82,005,000)               (38,232,000)   (3,075,000)                              
Debt instrument redemption price per principal amount                           1,052.77     1,061.34                                                      
Debt tender offer, aggregate principal amount                           750,000,000     365,500,000                                                      
Selling price of Senior Notes issued                                                                 99.50%   101.625%                  
Percentage of aggregate senior notes outstanding principal amount purchased                                                       100.00%                                
Debt instrument, repurchased face amount                                                       350,000,000                                
Long-term debt maturities, repayments of principal in the next twelve months                     0                                                                  
Long-term debt maturities, in years two and three                     0                                                                  
Long-term debt maturities, in years four and five                     $ 0                                                                  
Line of Credit Facility, Interest Rate Description       (a) the London Interbank Offered Rate (“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.