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Subsequent Event (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended		12 Months Ended
	Jun. 30, 2011 MMcf hp CompressorUnits Person	Aug. 31, 2010 Person CompressorUnits hp	Dec. 31, 2011 MMcf Compressor CompressorUnits Customers hp
Subsequent Event (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%
Capacity of natural gas processing plan	8		10
Number of customer units included in assets sale	207		140
Horsepower of compressor units	98,000		75,000
Total consideration excluding transaction costs			$ 184

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Horse power of compressor units.

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Horse power of compressor units used to provide compression services.

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Number of compressor units used to provide compression services.

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Number of customers to the partnership contract operations.

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Percentage of combined contract operations.

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Amount of transactions with related party during the financial reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 57

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-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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