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Divestitures - Additional Information (Details) (USD $)
6 Months Ended 0 Months Ended
Jun. 30, 2013
Permian Properties
Jun. 30, 2013
Permian Properties
Noncontrolling Interest
Feb. 25, 2014
Gulf Properties
Jun. 30, 2014
Gulf Properties
Feb. 25, 2014
Gulf Properties
Asset Retirement Obligations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of oil and natural gas properties $ 2,600,000,000   $ 703,500,000    
Asset retirement obligations assumed         366,000,000
Gain (loss) on sale of oil and gas property (399,100,000) (71,700,000) 0    
Contingent consideration, liability     9,446,000 12,028,000  
Restricted deposits     28,000,000    
Consideration receivable, current       $ 14,000,000