Amount of horsepower of compressor units acquired during the period.

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Represents the number of compressor units acquired during the period.

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Represents the length of contract operations services agreement to be effective at of the closing of the acquisition for assets acquired in the transaction, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

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The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Business Acquisitions (Details 2) (USD $) Share data in Millions, unless otherwise specified	1 Months Ended	0 Months Ended	3 Months Ended
	Apr. 30, 2014	Apr. 10, 2014 CompressorUnit hp	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
6% senior notes due October 2022
Business Acquisitions
Principle amount of senior notes	350,000,000
Interest rate (as a percent)	6.00%			6.00%	6.00%
Partners' Capital Common Units
Business Acquisitions
Units sold (in units)	6.2
April 2014 MidCon Acquisition
Business Acquisitions
Number of compressor units acquired		337
Horsepower of compressor units acquired		444,000
Purchase consideration		352,900,000
Transaction costs			1,500,000
Estimated fair value of acquired assets and liabilities assumed as of the acquisition date
Property, plant and equipment		311,270,000
Intangible assets		42,474,000
Current liabilities		(827,000)
Purchase price		352,917,000
Estimated average remaining useful life		25 years
Total acquired identifiable intangible assets		42,474,000
April 2014 MidCon Acquisition \| Customer related
Estimated fair value of acquired assets and liabilities assumed as of the acquisition date
Total acquired identifiable intangible assets		4,701,000
Average Useful Life		25 years
April 2014 MidCon Acquisition \| Contract based
Estimated fair value of acquired assets and liabilities assumed as of the acquisition date
Total acquired identifiable intangible assets		37,773,000
Average Useful Life		7 years
April 2014 MidCon Acquisition \| Williams Partners, L.P.
Business Acquisitions
Contract operations services agreement term		7 years
April 2014 MidCon Acquisition \| Wholly-owned subsidiary of Exterran Holdings
Business Acquisitions
Purchase consideration		$ 7,700,000