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Business Segment Information - Summarized Financial Information Concerning Segments (Parenthetical) (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Exploration and Production
Jun. 30, 2013
Drilling Assets
Dec. 31, 2013
Drilling Assets
Dec. 31, 2013
Drilling Assets
Drilling and Oil Field Services
Dec. 31, 2013
Gas Treating Plants and other Midstream Assets
Jun. 30, 2013
Gas Treating Plants and other Midstream Assets
Dec. 31, 2013
Gas Treating Plants and other Midstream Assets
Dec. 31, 2013
Gas Treating Plants and other Midstream Assets
Midstream Services
Dec. 31, 2012
Gas Treating Plants
Midstream Services
Jun. 30, 2013
Corporate Asset
Dec. 31, 2013
Corporate Asset
All Other
Dec. 31, 2013
CO2 Compression Facilities
All Other
Dec. 31, 2012
CO2 Compression Facilities
All Other
Segment Reporting Information [Line Items]                                  
Goodwill impairment loss $ 235,400,000   $ 235,400,000   $ 235,400,000                        
Asset impairment charges   $ 26,280,000 $ 316,004,000 $ 2,825,000   $ 10,600,000 $ 11,100,000 $ 11,100,000 $ 10,000,000 $ 2,100,000 $ 12,200,000 $ 3,900,000 $ 59,700,000 $ 2,900,000 $ 2,900,000 $ 8,300,000 $ 19,600,000