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Acquisitions (Details) (USD $)	9 Months Ended		2 Months Ended	3 Months Ended	9 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014 General partner	Sep. 30, 2013 General partner	Aug. 30, 2013 S&R	Sep. 30, 2013 S&R	Sep. 30, 2014 S&R	Sep. 30, 2013 S&R	Dec. 31, 2013 S&R	Aug. 30, 2013 S&R Common units	Sep. 30, 2013 S&R Limited partner Common units	Sep. 30, 2013 S&R Limited partner Common units	Sep. 30, 2013 S&R Limited partner Subordinated units	Sep. 30, 2013 S&R Limited partner Subordinated units
Acquisition of compression assets
Number of common units issued in exchange for contribution of assets								7,425,261
Cost of acquisition
Value of common units issued in exchange for contribution of assets								$ 181,900,000
Effective purchase price			178,500,000
Purchase price adjustment due to working capital changes			3,400,000
Adjustments to purchase accounting					0
Expenses associated with acquisition activities and transaction activities					50,000		2,100,000
Revenue, Net Income and Pro Forma Financial Information - Unaudited
Total revenues				44,934,000		127,547,000
Net income				3,822,000		13,269,000
Basic and diluted net income (in dollars per unit)									$ 0.10	$ 0.34	$ 0.10	$ 0.34
Revenue				6,600,000		23,300,000
Direct operating expenses				2,900,000		10,300,000
Depreciation and amortization				1,600,000		6,400,000
General partner interest (as a percent)	1.70%	2.00%
Estimated incremental interest expense reductions due to payment of revolving credit facility				$ 50,000		$ 100,000

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- Definition

The pro forma basic and diluted net income per share for a period, as if the business combination or combinations had been completed at the beginning of a period.

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This element represents the amount of direct operating expenses of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount of estimated incremental interest expense reductions due to payment of revolving credit facility, used to arrive at pro forma financial information under business acquisition.

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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Number of shares of equity interests issued or issuable to acquire entity.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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