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Transactions Related to the Partnership (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Nov. 30, 2011
Jun. 30, 2011
hp
CompressorUnits
Person
MMcf
May 31, 2011
Mar. 31, 2011
Sep. 30, 2010
Aug. 31, 2010
CompressorUnits
Person
hp
Dec. 31, 2011
MMcf
Compressor
CompressorUnits
hp
Customers
Related Party Transaction [Line Items]              
Total consideration excluding transaction costs             $ 184.0
General partner units     53,000        
Transactions Related to the Partnership (Textual) [Abstract]              
Number of customers to the partnership contract operations   34       43 40
Number of compressor units used to provide compression services   407       580 400
Horsepower of compressor units used to provide compression services   289,000       255,000 188,000
Percentage of the combined contract operations   8.00%       6.00% 5.00%
Assets sold that previously leased   207 compressor units, comprising approximately 98,000 horsepower          
Number of customer units included in assets sale   207         140
Horsepower of compressor units   98,000         75,000
Capacity of natural gas processing plant   8 million cubic feet per day          
Capacity of natural gas processing plan   8         10
Partners assumed debt in connection with acquisition   159.4          
Sale of common units     5,134,175 5,914,466 5,290,000    
Common units to cover over-allotments     134,175 664,466 690,000    
Net proceeds from the sale of the common units     127.7 162.2 109.4    
Repayment of borrowings under partners revolving credit facility     64.8        
General partner interest in partnership     2.00%        
Number of subordinated units 3,162,500         1,581,250  
Service Agreements [Member]
              
Related Party Transaction [Line Items]              
Description of sale of customer service agreements   34 customers and a fleet of 407 compressor units comprising 289,000 horsepower, or 8% of available horsepower       43 customers and a fleet of 580 compressor units comprising 255,000 horsepower, or 6% of available horsepower  
Total consideration excluding transaction costs   $ 223.0       214.0  
Issued wholly-owned subsidiaries   62,200,000       8,200,000  
General partner units   51,000       167,000