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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 |

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