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Organization and Summary of Significant Accounting Policies - Property and Equipment (Details)
9 Months Ended
Sep. 30, 2014
Compression equipment overhauls | Minimum
 
Property and Equipment  
Estimated useful lives 3 years
Compression equipment overhauls | Maximum
 
Property and Equipment  
Estimated useful lives 5 years
Compression equipment
 
Property and Equipment  
Estimated useful lives 25 years
Furniture and fixtures
 
Property and Equipment  
Estimated useful lives 7 years
Vehicles and computer equipment | Minimum
 
Property and Equipment  
Estimated useful lives 3 years
Vehicles and computer equipment | Maximum
 
Property and Equipment  
Estimated useful lives 7 years
Leasehold improvements
 
Property and Equipment  
Estimated useful lives 5 years