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Property, Plant and Equipment - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
$ / Boe
Dec. 31, 2014
USD ($)
company
$ / Boe
Dec. 31, 2013
USD ($)
company
$ / Boe
Jun. 30, 2015
USD ($)
May. 31, 2015
well
Jun. 30, 2014
USD ($)
well
Property, Plant and Equipment [Line Items]              
Cumulative full cost ceiling limitation impairment charges   $ 8,200,000,000 $ 3,700,000,000        
Full cost ceiling impairments $ 164,800,000 $ 4,500,000,000 $ 164,800,000 $ 0      
Average depreciation and depletion rate (usd per Boe) | $ / Boe   10.67 15.00 16.81      
Net value of assets held for sale   $ 491,760,000 $ 576,463,000        
Loss on sale of assets   $ 1,491,000 $ 10,000 $ 399,086,000      
Number of parties to agreements | company     2 2      
Period during which target number of wells should be drilled for the carry commitment to be reduced       12 months      
Expected completion of evaluation activities on majority of unproved properties   10 years          
Repsol              
Property, Plant and Equipment [Line Items]              
Drilling carry received or billed     $ 205,600,000        
Atinum and Repsol              
Property, Plant and Equipment [Line Items]              
Drilling carry received or billed       $ 408,000,000      
Repsol              
Property, Plant and Equipment [Line Items]              
Minimum net wells | well             484
Net wells | well           453  
Costs incurred toward satisfaction of obligation   $ 16,100,000          
Repsol | Potential Drilling Carry Costs              
Property, Plant and Equipment [Line Items]              
Repsol's future drilling and completion costs, per well             $ 1,000,000
Future drilling and completion costs   31,000,000         $ 75,000,000.0
Drilling and Oil Field Services              
Property, Plant and Equipment [Line Items]              
Net value of assets held for sale   16,000,000     $ 20,000,000    
Loss on sale of assets   $ 3,500,000