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Long-Term Debt - Additional Information (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
8.625% Senior Notes due 2015
Apr. 30, 2011
8.625% Senior Notes due 2015
Mar. 31, 2011
8.625% Senior Notes due 2015
Dec. 31, 2012
Senior Floating Rate Notes due 2014
Aug. 06, 2012
Senior Floating Rate Notes due 2014
Mar. 31, 2012
Senior credit facility
Dec. 31, 2012
Senior credit facility
Dec. 31, 2011
Senior credit facility
Dec. 31, 2010
Senior credit facility
Oct. 31, 2012
Senior credit facility
Aug. 31, 2012
Senior credit facility
Mar. 29, 2012
Senior credit facility
Dec. 31, 2012
Senior credit facility
Minimum
Dec. 31, 2012
Senior credit facility
Maximum
Mar. 29, 2012
Senior credit facility
Maximum
Dec. 31, 2012
Senior credit facility
LIBOR
Minimum
Dec. 31, 2012
Senior credit facility
LIBOR
Maximum
Dec. 31, 2012
Senior credit facility
Eurodollar Rate
Dec. 31, 2012
9.875% Senior Notes due 2016
Dec. 31, 2011
9.875% Senior Notes due 2016
Dec. 31, 2012
8.0% Senior Notes due 2018
Dec. 31, 2011
8.0% Senior Notes due 2018
Dec. 31, 2012
7.5% Senior Notes due 2023
Mar. 31, 2011
7.5% Senior Notes due 2021
Dec. 31, 2012
7.5% Senior Notes due 2021
Dec. 31, 2011
7.5% Senior Notes due 2021
May 31, 2012
Other notes payable
Mortgage note payable
Dec. 31, 2012
8.125% Senior Notes due 2022
Aug. 31, 2012
Tendered by August 17, 2012
Senior Floating Rate Notes due 2014
Aug. 31, 2012
2012 Activity
2012 Senior Notes
Dec. 31, 2012
2012 Activity
2012 Senior Notes
Aug. 31, 2012
2012 Activity
7.5% Senior Notes due 2023
Dec. 31, 2012
2012 Activity
7.5% Senior Notes due 2023
Aug. 31, 2012
2012 Activity
7.5% Senior Notes due 2021
Apr. 17, 2012
2012 Activity
8.125% Senior Notes due 2022
Dec. 31, 2012
2012 Activity
8.125% Senior Notes due 2022
Sep. 04, 2012
Tendered after August 17, 2012
Senior Floating Rate Notes due 2014
Debt Instrument [Line Items]                                                                                
Line of credit facility amended maximum borrowings capacity                             $ 1,000,000,000                                                  
Line of credit facility maximum borrowings capacity                         775,000,000 775,000,000 790,000,000                                                  
Issuance of additional debt                                   750,000,000                                            
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                       2016   2018   2023   2021     2022                  
Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination                   80.00%                                                            
Long-term debt, interest rate, applicable margin                               0.75% 1.75%   1.75% 2.75% 1.00%                                      
Long-term debt, interest rate in addition to federal funds rate                   0.50%                                                            
Line of credit facility, unused capacity, commitment fee percentage                   0.50%                                                            
Line of credit facility, amount outstanding                   0                                                            
Line of credit facility, average annual interest rates                     2.69% 2.70%                                                        
Line of credit facility borrowing capacity prior to additional debt issuance                           1,000,000,000                                                    
Line of credit facility, additional costs as a result of amendments to the credit agreement and changes to the borrowing base                   7,500,000                                                            
Letters of credit, outstanding 30,200,000                                                                              
Line of credit facility, amendment description                 On March 29, 2012, the senior credit facility was amended and restated to, among other things, (a) increase the borrowing base to $1.0 billion from $790.0 million, (b) allow for the incurrence or issuance of additional debt (including up to $750.0 million of unsecured debt to finance the cash portion of the Dynamic purchase price and related costs and expenses), (c) permit the Company to designate certain of its subsidiaries as unrestricted subsidiaries, and (d) effective on and after June 30, 2012, establish the financial covenants as maintaining agreed upon levels for (i) ratio of total funded debt to EBITDA, which may not exceed 4.5:1.0 at each quarter end, calculated using the last four completed fiscal quarters and (ii) ratio of current assets to current liabilities, which must be at least 1.0:1.0 at each quarter end. If no amounts are drawn under the senior credit facility when calculating the ratio of total funded debt to EBITDA, the Company’s debt is reduced by its cash balance in excess of $10.0 million. In the current ratio calculation, any amounts available to be drawn under the senior credit facility are included in current assets, and unrealized assets and liabilities resulting from mark-to-market adjustments on the Company’s derivative contracts are disregarded.                                                              
Line of credit facility, financial covenants compliance                   As of and during the year ended December 31, 2012, 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, interest rate determination reference                   (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.                                                            
Debt issuance cost, cumulative 94,100,000                                                                              
Debt issuance cost                                                                   41,000,000            
Long-term debt, fixed interest rate           8.625%                               9.875% 9.875% 8.00% 8.00% 7.50%   7.50% 7.50%   8.125%                  
Senior notes issued                                                     900,000,000                          
Percentage of aggregate senior notes outstanding principal amount purchased           94.50%                                                                    
Aggregate senior notes outstanding principal amount purchased         35,800,000 614,200,000                                                                   20,100,000
Premium paid to purchase notes and unamortized debt issuance cost in relation to the notes (3,075,000) (38,232,000) 0 (38,232,000)     (3,075,000)                                                                  
Debt instrument issuance date, month and year                                                                       August 2012     April 2012  
Debt Instrument, Face Amount                                                                     825,000,000   275,000,000      
Face amount of Senior Notes issued                                                                           750,000,000    
Proceeds from debt, net of issuance costs                                                                 1,100,000,000         730,100,000    
Debt tender offer, aggregate principal amount tendered                                                               329,900,000                
Debt Tendered Percentage Of Principal Amount Payment                                                               94.30%                
Selling price of Senior Notes issued                                                                     99.50%   101.625%      
Long-term debt, interest rate above LIBOR               3.625%                                                                
Debt Tender Offer Aggregate Principal Amount               350,000,000                                                                
Long-term debt, payment of outstanding principal                                                           15,800,000                    
Long-term debt, maturities, repayments of principal in 2016 365,500,000                                                                              
Long-term debt, maturities, repayments of principal thereafter $ 4,000,000,000