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Background and Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2011
Y
Compression equipment, facilities and other fleet assets [Member]
 
Property, plant and equipment estimated useful lives  
Property, plant and equipment, estimated useful life, minimum 3
Property, plant and equipment, estimated useful life, maximum 30
Building [Member]
 
Property, plant and equipment estimated useful lives  
Property, plant and equipment, estimated useful life, minimum 20
Property, plant and equipment, estimated useful life, maximum 35
Transportation, shop equipment and other [Member]
 
Property, plant and equipment estimated useful lives  
Property, plant and equipment, estimated useful life, minimum 3
Property, plant and equipment, estimated useful life, maximum 12