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Impairment - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Gas Treating Plants and CO2 Compression Facilities
Dec. 31, 2012
Rigs
Dec. 31, 2012
Software Costs
Dec. 31, 2011
Natural Gas Compressors
Impaired Long-Lived Assets Held and Used [Line Items]              
Asset impairment charges $ 316,004 $ 2,825 $ 0 $ 79,300 $ 0 $ 1,300 $ 2,825