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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 |  |  |  |  |

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