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Long-Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Senior secured revolving line of credit [Member]
Apr. 05, 2013
Senior secured revolving line of credit [Member]
Sep. 24, 2013
2022 Notes [Member]
Dec. 31, 2013
Senior unsecured notes [Member]
Dec. 31, 2013
Amended Credit Facility [Member]
Oct. 02, 2013
Amended Credit Facility [Member]
Apr. 05, 2013
Amended Credit Facility [Member]
Oct. 02, 2012
Amended Credit Facility [Member]
Dec. 31, 2013
Amended Credit Facility [Member]
Minimum [Member]
EBITDAX [Member]
Dec. 31, 2013
Amended Credit Facility [Member]
Minimum [Member]
Current Ratio [Member]
Dec. 31, 2012
2023 Notes [Member]
Dec. 31, 2012
2019 Notes [Member]
Dec. 31, 2012
2021 Notes [Member]
Debt Disclosure [Line Items]                                
Net proceeds from issuance of notes           $ 983,600,000 $ 1,175,800,000                  
Senior unsecured debt principal amount           1,000,000,000               400,000,000 400,000,000 400,000,000
Senior unsecured notes stated interest rate           6.875%               6.875% 7.25% 6.50%
Senior unsecured notes payment frequency             Semi-annually                  
Debt instrument, maturity date           Mar. 15, 2022               Jan. 15, 2023 Feb. 01, 2019 Nov. 01, 2021
Redemption percentage, maximum             35.00%                  
Percentage of minimum outstanding principal amount             65.00%                  
Event of default by payment default             10,000,000                  
Event of default by final judgments             10,000,000                  
Current borrowing capacity                 1,500,000,000              
Letter of credit maximum borrowings                   1,250,000,000 750,000,000          
Letter of credit borrowings       2,500,000,000.0 1,000,000,000.0       1,500,000,000.0 900,000,000.0            
Letter of credit unused borrowing base capacity               1,159,200,000                
Commitment fee of borrowing base capacity not utilized               0.375%                
Minimum debt to EBITDAX ratio                       2.5        
Minimum current ratio                         1.0      
Long-term Debt             2,200,000,000 335,600,000                
Outstanding letters of credit               5,200,000                
Deferred financing costs 41,800,000                              
Amortization of Financing Costs $ 4,500,000 $ 3,000,000 $ 1,700,000