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Subsequent Events - Additional Information (Details) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 2 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Permian Trust
Dec. 31, 2012
Permian Trust
Aug. 31, 2011
Permian Trust
Dec. 31, 2013
Royalty Trusts
Dec. 31, 2012
Royalty Trusts
Jan. 09, 2014
Subsequent Event
Permian Trust
Jan. 30, 2014
Royalty Trust Distributions
Royalty Trusts
Dec. 31, 2013
Commodity Derivatives
Sep. 30, 2013
Commodity Derivatives
Jun. 30, 2013
Commodity Derivatives
Mar. 31, 2013
Commodity Derivatives
Dec. 31, 2012
Commodity Derivatives
Sep. 30, 2012
Commodity Derivatives
Jun. 30, 2012
Commodity Derivatives
Mar. 31, 2012
Commodity Derivatives
Dec. 31, 2013
Commodity Derivatives
Dec. 31, 2012
Commodity Derivatives
Dec. 31, 2011
Commodity Derivatives
Feb. 25, 2014
Gulf of Mexico Properties
Subsequent Event
Dec. 31, 2013
Gulf of Mexico Properties
Subsequent Event
MMBoe
Dec. 31, 2013
Cash
Commodity Derivatives
Dec. 31, 2012
Cash
Commodity Derivatives
Dec. 31, 2011
Cash
Commodity Derivatives
Dec. 31, 2013
Cash
Derivative Contracts Early Settlements
Commodity Derivatives
Feb. 28, 2014
Cash
Derivative Contracts Early Settlements
Gulf of Mexico Properties
Commodity Derivatives
Subsequent Event
Feb. 25, 2014
Asset Retirement Obligations
Gulf of Mexico Properties
Subsequent Event
Subsequent Event [Line Items]                                                                          
Proceeds from the sale of royalty trust units                 $ 28,985,000 $ 139,360,000 $ 0       $ 28,985,000 $ 139,360,000 $ 22,100,000                                        
Beneficial interest owned by Company                       28.50% 30.50% 34.30% [1]     25.00%                                        
Subsequent event, description                                   On January 30, 2014, the Royalty Trusts announced quarterly distributions for the three-month period ended December 31, 2013. The following distributions will be paid on February 28, 2014 to holders of record as of the close of business on February 14, 2014                                      
Expected distribution date                                   February 28, 2014                                      
Distributions record date                                   February 14, 2014                                      
Proceeds from sale of oil and natural gas properties                                                           750,000,000              
Asset retirement obligation assumed                                                                         370,000,000
Fair value of guarantee as of year end                                                           9,000,000              
Restricted deposits                                                           27,900,000              
Consideration receivable, current                                                           14,000,000              
Loss (gain) on derivative contracts                 47,123,000 (241,419,000) (44,075,000)               (22,900,000) 132,800,000 (103,700,000) 40,900,000 (19,600,000) 193,500,000 (669,900,000) 254,600,000 47,123,000 (241,419,000) (44,075,000)     (3,200,000) (100,700,000) 37,600,000 29,600,000 69,600,000  
Production, MMBoe                                                             10.1            
Total revenues 465,108,000 493,603,000 512,987,000 511,690,000 1,338,098,000 532,798,000 478,434,000 381,635,000 1,983,388,000 2,730,965,000 1,415,213,000                                       627,200,000            
Total expenses                 $ 2,152,389,000 $ 2,405,769,000 $ 986,200,000                                       $ 492,000,000            
[1] Subsequent to the initial public offerings, the Company sold common units of the Royalty Trusts it owned in transactions exempt from registration under Rule 144 under the Securities Act. These transactions decreased the Company’s beneficial interests in the Royalty Trusts. See further discussion of the unit sales below.