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Asset Retirement Obligations - Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Reconciliation Of Changes In Asset Retirement Obligations  
Liability settled or disposed in current period(1) $ (100,653) [1]
Bullwinkle Platform
  
Reconciliation Of Changes In Asset Retirement Obligations  
Liability settled or disposed in current period(1) (22,700) [1]
Permian Properties
  
Reconciliation Of Changes In Asset Retirement Obligations  
Liability settled or disposed in current period(1) (15,200) [1]
East Breaks Region | Platforms, pipelines and associated wells
  
Reconciliation Of Changes In Asset Retirement Obligations  
Liability settled or disposed in current period(1) (17,100) [1]
West Delta Region | Platforms, pipelines and associated wells
  
Reconciliation Of Changes In Asset Retirement Obligations  
Liability settled or disposed in current period(1) $ (21,300) [1]
[1] Liability settled or disposed during the nine-month period ended September 30, 2013 includes $22.7 million for the settlement of a plugging and abandonment obligation associated with the Company’s Bullwinkle platform in the Gulf of Mexico and $15.2 million disposed in conjunction with the sale of the Permian Properties in February 2013. Additionally, $17.1 million and $21.3 million were spent in the East Breaks and West Delta regions, respectively, to decommission various platforms, pipeline and associated wells during the nine-month period ended September 30, 2013.