Third Coast Midstream (AMID) 10-Q 10 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 06, 2014	Dec. 31, 2013
Document Information [Line Items]	'	'	'
Entity Registrant Name	'American Midstream Partners, LP	'	'
Entity Central Index Key	'0001513965	'	'
Document Type	'10-Q	'	'
Document Period End Date	30-Sep-14	'	'
Amendment Flag	'false	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'Q3	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Non-accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	15,775,018	'
Temporary Equity, Shares Outstanding	5,585,611	5,585,611	5,279,000
Series B [Member]	'	'	'
Document Information [Line Items]	'	'	'
Limited Partners' Capital Account, Units Outstanding	'	1,232,017	0

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$459	$393
Accounts receivable	7,430	6,822
Unbilled revenue	21,271	23,001
Risk management assets	1,047	473
Other current assets	4,715	7,497
Current assets held for sale	29	272
Total current assets	34,951	38,458
Property, plant and equipment, net	415,799	312,701
Goodwill	16,253	16,447
Intangible assets, net	45,585	3,682
Investment in unconsolidated affiliate	11,017	0
Other assets, net	11,195	9,064
Noncurrent assets held for sale, net	1,164	1,723
Total assets	535,964	382,075
Current liabilities	'	'
Accounts payable	12,426	3,261
Accrued gas purchases	14,762	17,386
Accrued expenses and other current liabilities	21,425	15,058
Current portion of long-term debt	1	2,048
Risk management liabilities	335	423
Current liabilities held for sale	1	114
Total current liabilities	48,950	38,290
Risk management liabilities	0	101
Asset retirement obligations	34,782	34,636
Other liabilities	161	191
Long- term debt	57,700	130,735
Deferred tax liability	4,816	4,749
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	95
Total liabilities	146,409	208,797
Series A convertible preferred units (5,586 thousand and 5,279 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	104,736	94,811
Partners' capital	'	'
General partner interest (299 thousand and 185 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	-3,106	2,696
Accumulated other comprehensive income	157	104
Total partners’ capital	280,286	73,839
Noncontrolling interests	4,533	4,628
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	284,819	78,467
Total liabilities, equity and partners' capital	535,964	382,075
Limited Partner Common Units [Member]	'	'
Partners' capital	'	'
Limited partner interest (15,771 thousand and 7,414 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	251,564	71,039
Limited Partner Series B Convertible Units [Member]	'	'
Partners' capital	'	'
Limited partner interest (15,771 thousand and 7,414 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	$31,671	$0

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited)	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]	'	'
Series A convertible preferred, units issued	5,585,611	5,278,562
Temporary Equity, Shares Outstanding	5,585,611	5,279,000
General partner interest, units issued	298,582	185,451
General partner interest units outstanding	298,582	185,451

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$69,699	$78,018	$227,940	$217,201
(Loss) gain on commodity derivatives, net	606	-499	283	110
Total Revenue	70,305	77,519	228,223	217,311
Operating expenses:	'	'	'	'
Purchases of natural gas, NGLs and condensate	46,690	55,765	155,729	162,998
Direct operating expenses	11,884	9,092	31,889	22,369
Selling, general and administrative expenses	5,875	4,494	17,105	12,507
Equity compensation expense	337	392	1,132	1,877
Depreciation, amortization and accretion expense	5,706	7,880	19,350	22,274
Costs and Expenses	70,492	77,623	225,205	222,025
Gain on involuntary conversion of property, plant and equipment	0	0	0	343
Loss on sale of assets, net	-103	0	-124	0
Loss on impairment of property, plant and equipment	0	0	0	15,232
Operating income (loss)	-290	-104	2,894	-19,603
Interest expense	-1,430	-2,636	-5,013	-6,958
Other expense	-672	0	-672	0
Earnings in unconsolidated affiliate	117	0	117	0
Income (Loss) before income tax expense	-2,275	-2,740	-2,674	-26,561
Income tax (expense) benefit	-122	214	-260	589
Net loss from continuing operations	-2,397	-2,526	-2,934	-25,972
Loss from operations of disposal groups, net of tax	-26	-15	-582	-1,891
Net loss	-2,423	-2,541	-3,516	-27,863
Net income attributable to noncontrolling interests	33	190	207	533
Net loss attributable to the Partnership	-2,456	-2,731	-3,723	-28,396
General partner's interest in net loss	-32	'	'	'
Limited partners' interest in net loss	($2,424)	'	'	'
Distribution declared per common unit (a)	$0.46	$0.43	$1.38	$0.87
Limited partners’ net (loss) income from continuing operations per unit (basic)	($0.58)	($0.81)	($1.52)	($5.52)
Loss from discontinued operations	$0	$0.01	($0.05)	($0.21)
Limited partners’ net (loss) income per unit (basic)	($0.58)	($0.80)	($1.57)	($5.73)
Weighted Average Number of Shares Outstanding, Basic	13,204	6,663	11,409	8,334

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net loss	($2,423)	($2,541)	($3,516)	($27,863)
Other comprehensive income (loss)	7	-34	53	-90
Comprehensive loss	-2,416	-2,575	-3,463	-27,953
Net Income (Loss) Attributable to Noncontrolling Interest	33	190	207	533
Comprehensive loss attributable to Partnership	-2,449	-2,765	-3,670	-28,486
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'
Net loss	'	'	0	0
Noncontrolling Interest [Member]	'	'	'	'
Other comprehensive income (loss)	'	'	$0	$0

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Changes in Partners' Capital (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Partners' Capital	$280,286,000	$56,015,000	$280,286,000	$56,015,000	$73,839,000	$80,165,000
Net Income (Loss) Allocated to General Partners	-32,000	'	'	'	'	'
Net Income (Loss) Allocated to Limited Partners	-2,424,000	'	'	'	'	'
Net loss	-2,423,000	-2,541,000	-3,516,000	-27,863,000	'	'
Net Income (Loss) Attributable to Parent	-2,456,000	-2,731,000	-3,723,000	-28,396,000	'	'
Unitholder contributions	'	'	2,964,000	'	'	'
Stock Issued During Period, Value, Other	'	'	'	35,196,000	'	'
Partners' Capital Account, Distributions	'	'	-29,825,000	-16,672,000	'	'
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	'	'	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	0	15,612,000	'	'
Net distributions to noncontrolling interest owners	'	'	0	0	'	'
Acquisition of noncontrolling interest	'	'	-8,000	0	'	'
Allocated Partners Capital Account Units, Value, Unit Based Compensation Ltip Vesting	'	'	205,000	0	'	'
LTIP tax netting unit repurchase	'	'	-253,000	-400,000	'	'
Partners' Capital Account, Unit-based Compensation	'	'	999,000	1,824,000	'	'
Other comprehensive income (loss)	7,000	-34,000	53,000	-90,000	'	'
Unrealized gain (loss) on post retirement benefit plan assets and liabilities	'	'	53,000	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	119,300,000	'	-204,335,000	0	'	'
Proceeds from Issuance of Common Limited Partners Units	'	'	31,671,000	'	'	'
Noncontrolling Interest [Member]	'	'	'	'	'	'
Partners' Capital	4,533,000	7,400,000	4,533,000	7,400,000	4,628,000	7,438,000
Unitholder contributions	'	'	0	'	'	'
Stock Issued During Period, Value, Other	'	'	'	0	'	'
Proceeds from Issuance of Common Stock	'	'	0	0	'	'
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	'	'	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	0	'	'
Net distributions to noncontrolling interest owners	'	'	273,000	571,000	'	'
Acquisition of noncontrolling interest	'	'	29,000	'	'	'
Allocated Partners Capital Account Units, Value, Unit Based Compensation Ltip Vesting	'	'	0	0	'	'
LTIP tax netting unit repurchase	'	'	0	0	'	'
Partners' Capital Account, Unit-based Compensation	'	'	0	0	'	'
Other comprehensive income (loss)	'	'	0	0	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	0	'	'	'
Proceeds from Issuance of Common Limited Partners Units	'	'	0	'	'	'
General Partner [Member]	'	'	'	'	'	'
Partners' Capital	-3,106,000	34,152,000	-3,106,000	34,152,000	2,696,000	548,000
Net Income (Loss) Allocated to General Partners	'	-221,000	-48,000	-1,194,000	'	'
Unitholder contributions	'	'	2,964,000	35,196,000	'	'
Partners' Capital Account, Distributions	-603,000	-80,000	-1,857,000	-340,000	'	'
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	'	'	7,164,000	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	312,000	'	'
Net distributions to noncontrolling interest owners	'	'	0	0	'	'
Acquisition of noncontrolling interest	'	'	0	'	'	'
Allocated Partners Capital Account Units, Value, Unit Based Compensation Ltip Vesting	'	'	696,000	1,570,000	'	'
LTIP tax netting unit repurchase	'	'	0	0	'	'
Partners' Capital Account, Unit-based Compensation	'	'	999,000	1,824,000	'	'
Other comprehensive income (loss)	'	'	0	0	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	0	'	'	'
Proceeds from Issuance of Common Limited Partners Units	'	'	0	'	'	'
Limited Partner [Member]	'	'	'	'	'	'
Partners' Capital	251,564,000	21,602,000	251,564,000	21,602,000	71,039,000	79,266,000
Net Income (Loss) Allocated to Limited Partners	'	-2,510,000	-3,675,000	-27,202,000	'	'
Unitholder contributions	'	'	0	0	'	'
Partners' Capital Account, Distributions	'	'	-27,968,000	-16,332,000	'	'
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	'	'	7,164,000	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	15,300,000	'	'
Net distributions to noncontrolling interest owners	'	'	0	0	'	'
Acquisition of noncontrolling interest	'	'	21,000	'	'	'
Allocated Partners Capital Account Units, Value, Unit Based Compensation Ltip Vesting	'	'	901,000	1,570,000	'	'
LTIP tax netting unit repurchase	'	'	-253,000	-400,000	'	'
Partners' Capital Account, Unit-based Compensation	'	'	0	0	'	'
Other comprehensive income (loss)	'	'	0	0	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	204,335,000	'	'	'
Proceeds from Issuance of Common Limited Partners Units	'	'	0	'	'	'
Series B [Member]	'	'	'	'	'	'
Partners' Capital	31,671,000	0	31,671,000	0	0	0
Net Income (Loss) Allocated to General Partners	'	'	'	0	'	'
Net loss	'	'	0	'	'	'
Unitholder contributions	'	'	0	0	'	'
Partners' Capital Account, Distributions	'	'	0	0	'	'
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	'	'	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	0	'	'
Net distributions to noncontrolling interest owners	'	'	0	0	'	'
Acquisition of noncontrolling interest	'	'	0	'	'	'
Allocated Partners Capital Account Units, Value, Unit Based Compensation Ltip Vesting	'	'	0	0	'	'
LTIP tax netting unit repurchase	'	'	0	0	'	'
Partners' Capital Account, Unit-based Compensation	'	'	0	0	'	'
Other comprehensive income (loss)	'	'	0	0	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	0	'	'	'
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'	'	'
Partners' Capital	157,000	261,000	157,000	261,000	104,000	351,000
Net loss	'	'	0	0	'	'
Unitholder contributions	'	'	0	0	'	'
Partners' Capital Account, Distributions	'	'	0	0	'	'
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	'	'	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	0	'	'
Net distributions to noncontrolling interest owners	'	'	0	0	'	'
Acquisition of noncontrolling interest	'	'	0	'	'	'
Allocated Partners Capital Account Units, Value, Unit Based Compensation Ltip Vesting	'	'	0	0	'	'
LTIP tax netting unit repurchase	'	'	0	0	'	'
Partners' Capital Account, Unit-based Compensation	'	'	0	0	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	0	'	'	'
Consolidated Entities [Member]	'	'	'	'	'	'
Acquisition of noncontrolling interest	'	'	21,000	'	'	'
Series B [Member]	'	'	'	'	'	'
Partners' Capital Account, Distributions	-619,000	0	-1,671,000	0	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	-30,000,000	0	'	'
Series B [Member] | Series B [Member]	'	'	'	'	'	'
Proceeds from Issuance of Common Limited Partners Units	'	'	31,671,000	'	'	'
Series B [Member] | Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'	'	'
Proceeds from Issuance of Common Limited Partners Units	'	'	$0	'	'	'

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Net loss	($3,516,000)	($27,863,000)
Depreciation, amortization and accretion expense	19,350,000	22,274,000
Depreciation and Accretion Expense, Including Discontinued Operation	'	22,355,000
Amortization of deferred financing costs	1,894,000	975,000
Amortization of weather derivative premium	794,000	378,000
Unrealized (gain) loss on commodity derivatives, net	592,000	-1,159,000
Non-cash compensation expense	1,200,000	1,824,000
OPEB plan net periodic benefit	-35,000	-55,000
Gain on involuntary conversion of property, plant and equipment	0	343,000
Loss on sale of assets	209,000	0
Loss on impairment of property, plant and equipment	0	15,232,000
Loss on impairment of noncurrent assets held for sale	673,000	1,807,000
Deferred tax benefit	-58,000	-662,000
Accounts receivable	599,000	-397,000
Unbilled revenue	-1,913,000	1,970,000
Risk management assets and liabilities	965,000	1,147,000
Other current assets	2,858,000	602,000
Other assets, net	-608,000	-67,000
Accounts payable	624,000	121,000
Accrued gas purchases	-2,734,000	273,000
Accrued expenses and other current liabilities	-1,446,000	2,685,000
Asset retirement obligations	-690,000	0
Other liabilities	-32,000	-114,000
Net Cash Provided by (Used in) Operating Activities	-18,240,000	-15,587,000
Cost of acquisitions	-110,909,000	0
Additions to property, plant and equipment	41,257,000	22,842,000
Proceeds from disposals of property, plant and equipment	6,323,000	0
Insurance proceeds from involuntary conversion of property, plant and equipment	0	482,000
Equity method investment	-12,000,000	0
Proceeds from equity method investment, return of capital	983,000	0
Net Cash Provided by (Used in) Investing Activities	-156,860,000	-22,360,000
Partners' Capital Account, Public Sale of Units Net of Offering Costs	204,335,000	0
Unitholder contributions	2,896,000	13,075,000
Unitholder distributions	19,549,000	12,458,000
Issuance of Series A convertible preferred units, net	0	14,393,000
Acquisition of noncontrolling interest	-8,000	0
Net distributions to noncontrolling interest owners	0	0
LTIP tax netting unit repurchase	-253,000	-400,000
Payments of deferred debt issuance costs	3,380,000	1,509,000
Payments on other debt	2,217,000	2,231,000
Borrowings on other debt	170,000	1,495,000
Payments on loan to affiliate	0	1,072,000
Payments on bank loans	0	6,200,000
Payments on long-term debt	212,670,000	99,821,000
Borrowings on long-term debt	139,635,000	92,571,000
Net Cash Provided by (Used in) Financing Activities	138,686,000	9,672,000
Net increase in cash and cash equivalents	66,000	2,899,000
Beginning of period	393,000	576,000
End of period	459,000	3,475,000
Interest payments, net	4,064,000	5,051,000
Increase (decrease) in accrued property, plant and equipment	17,746,000	-6,080,000
Fair value of Series A Units in excess of net assets received	0	15,612,000
Accrued and in-kind unitholder distribution for Series A Units	9,925,000	2,912,000
In-kind unitholder distribution for Series B Units	1,671,000	0
Series B [Member]	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	30,000,000	0
Blackwater [Member]	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	0	22,129,000
ArcLight [Member]	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	0	59,994,000
Noncontrolling Interest [Member]	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	0	'
Acquisition of noncontrolling interest	29,000	'
Net distributions to noncontrolling interest owners	273,000	571,000
LTIP tax netting unit repurchase	0	0
Fair value of Series A Units in excess of net assets received	'	$0

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization and Basis of Presentation	'
	Organization and Basis of Presentation
	Nature of Business
	American Midstream Partners, LP (the “Partnership”), was formed on August 20, 2009 as a Delaware limited partnership for the purpose of operating, developing and acquiring a diversified portfolio of midstream energy assets. We provide natural gas gathering, treating, processing, fractionating, marketing and transportation services primarily in the Gulf Coast and Southeast regions of the United States through our ownership and operation of nine gathering systems, two processing facilities, one fractionation facility, three interstate pipelines and five intrastate pipelines. In addition, we own a 50% undivided, non-operating interest in a processing plant located in southern Louisiana. Through our four marine terminal sites, we provide petroleum, agricultural, and chemical liquid storage services.
	We hold our assets in a series of wholly owned limited liability companies, a limited partnership and a corporation. Our capital accounts consist of general partner interests and limited partner interests.
	Our interstate natural gas pipeline assets transport natural gas through the FERC regulated interstate natural gas pipelines in Louisiana, Mississippi, Alabama and Tennessee. Our interstate pipelines include:
	•	High Point Gas Transmission, LLC, which owns and operates approximately 400 miles of intrastate pipeline and is connected to 40 meters with 32 active producers and offers processing options at the Toca processing plant with delivery to Southern Natural Gas available downstream of the processing plant in Louisiana;
	•	American Midstream (Midla), LLC, which owns and operates approximately 370 miles of interstate pipeline that runs from the Monroe gas field in northern Louisiana south through Mississippi to Baton Rouge, Louisiana;
	•	American Midstream (AlaTenn), LLC, which owns and operates approximately 295 miles of interstate pipeline that runs through the Tennessee River Valley from Selmer, Tennessee to Huntsville, Alabama and serves an eight-county area in Alabama, Mississippi and Tennessee.
	Common Unit Purchase Agreement
	On July 14, 2014, the Partnership entered into a common unit purchase agreement with certain institutional investors, which was subsequently amended on August 15, 2014 to provide for the sale of 4,622,352 common units representing limited partner interests in the Partnership (the "PIPE Offering") in a private placement at a price of $25.8075 per common unit (reflecting an adjustment for the Partnership's second quarter distribution of $0.4625 per unit), for cash consideration of $119.3 million. The PIPE Offering was completed on August 20, 2014.
	Series A Distribution Amendment
	The Partnership executed an amendment (the "Amendment") to the Partnership agreement related to its outstanding Series A convertible preferred units ("Series A Units") which became effective July 24, 2014. As a result of the Amendment, distributions on Series A Units will be made with paid-in-kind Series A Units, cash or a combination thereof, at the discretion of the Board of Directors, which began with the distribution for the three months ended June 30, 2014 and will continue through the distribution for the quarter ended March 31, 2015. Prior to the Amendment, the Partnership was required to pay distributions on the Series A Units with a combination of paid-in-kind units and cash. We have recorded the impacts of the Amendment for the three months ended September 30, 2014 and have accrued $4.2 million for the paid-in-kind Series A Units.
	Equity Offering and Series B Convertible Units Issuance
	In January 2014, in connection with the Lavaca Acquisition as discussed in Note 3, the Partnership completed a public equity offering resulting in net proceeds of $86.9 million and the issuance to our General Partner of 1,168,225 Series B convertible units ("Series B Units") representing Series B limited partnership interests in the Partnership. The net proceeds related to the Series B Units issuance was $30.0 million. The Series B Units have the right to share in distributions from the Partnership on a pro-rata basis with holders of the Partnership’s common units and will convert into common units on a one-for-one basis on January 31, 2016. During 2014, the Partnership has elected to pay the Series B distributions using paid-in-kind Series B Units.
	Basis of Presentation
	These unaudited condensed consolidated financial statements have been prepared in accordance with GAAP for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from consolidated audited financial statements but does not include disclosures required by GAAP for annual periods. We have made reclassifications to amounts reported in prior period condensed consolidated financial statements to conform to our current year presentation. These reclassifications did not have an impact on net income for the period previously reported. The information furnished herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair statement of financial position and results of operations for the respective interim periods.
	The financial results for the three and nine months ended September 30, 2013 have been reclassified to present an asset group previously presented as held for sale as held and used.
	Our financial results for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the full year ended December 31, 2014. These unaudited condensed consolidated financial statements should be read in conjunction with our consolidated financial statements and notes thereto included in i) our Annual Report on Form 10-K for the year ended December 31, 2013 (“Annual Report”) filed on March 11, 2014 and ii) our Annual Report on Form 10-K/A that was filed with the Securities and Exchange Commission ("SEC") on May 12, 2014, which updated portions of our annual report.
	Consolidation Policy
	Our condensed consolidated financial statements include our accounts and those of our subsidiaries in which we have a controlling interest. We hold a 50% undivided interest in the Burns Point gas processing facility in which we are responsible for our proportionate share of the costs and expenses of the facility. Our condensed consolidated financial statements reflect our proportionate share of the revenues, expenses, assets and liabilities of this undivided interest. As of September 30, 2014, we also hold a 92.2% undivided interest in the Chatom Processing and Fractionation facility (the "Chatom System"). Our condensed consolidated financial statements reflect the accounts of the Chatom System and the interests in the Chatom System held by non-affiliated working interest owners are reflected as noncontrolling interests in the Partnership's condensed consolidated financial statements.
	The Partnership accounts for its 66.7% non-operated interest in Main Pass Oil Gathering Company ("MPOG") as an equity method investments under ASC 323, as the Partnership exercises significant influence but does not control nor is the primary beneficiary of MPOG.
	Use of Estimates
	When preparing condensed consolidated financial statements in conformity with GAAP, management must make estimates and assumptions based on information available at the time. These estimates and assumptions affect the reported amounts of assets, liabilities, revenues and expenses, as well as the disclosures of contingent assets and liabilities as of the date of the financial statements. Estimates and judgments are based on information available at the time such estimates and judgments are made. Adjustments made with respect to the use of these estimates and judgments often relate to information not previously available. Uncertainties with respect to such estimates and judgments are inherent in the preparation of financial statements. Estimates and judgments are used in, among other things i) estimating unbilled revenues, accrued gas purchases and operating and general and administrative costs, ii) developing fair value assumptions, including estimates of future cash flows and discount rates, iii) analyzing long-lived assets, goodwill and intangible assets for possible impairment, iv) estimating the useful lives of assets and v) determining amounts to accrue for contingencies, guarantees and indemnifications. Actual results, therefore, could differ materially from estimated amounts.

Acquisitions_and_Divestitures

Acquisitions and Divestitures	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	'
	Acquisitions and Divestitures
	Lavaca Acquisition
	On January 31, 2014, the Partnership acquired approximately 120 miles of high- and low-pressure pipelines ranging from four to eight inches in diameter with over 9,000 horsepower of leased compression, and associated facilities located in the Eagle Ford shale in Gonzales and Lavaca Counties, Texas (the “Lavaca Acquisition”). The Lavaca Acquisition was financed with a portion of the net proceeds from the Partnership’s January 2014 equity offering of $86.9 million and proceeds of $30.0 million from the issuance to our General Partner of 1,168,225 Series B Units.
	The Lavaca Acquisition qualified as a business combination in accordance with ASC 805, Business Combinations, and, as such, the Partnership engaged a third party to estimate the fair value of the assets as of the effective date of the acquisition. A combination of the income and cost approaches were utilized to estimate the fair value of the assets. These fair value measurements are based on significant inputs not observable in the market and thus represent a Level 3 measurement as defined by ASC 820, Fair Value Measurement.
	Primarily using the cost approach to value the physical assets, the fair value estimates are based on i) replacement cost estimates using third party data based on installations of similar assets and ii) estimated depreciation on the assets based on third party sources and analysis of the life and use of the assets.
	It was determined as part of the fair value analysis of the acquisition, that the Partnership acquired separately identifiable intangible assets. The Lavaca Acquisition includes a 25-year gas gathering agreement which states that Penn Virginia Corporation (NYSE: PVA) ("PVA") will dedicate certain acreage and all related future production to the gathering infrastructure included in the acquisition. In accordance with ASC 805, contract based intangible assets include the value of rights derived from contractual agreements. The Partnership will receive incremental value from PVA’s development of the reserves within the dedicated acreage and, therefore, it was determined that the dedicated acreage represents intangible assets acquired with the Lavaca Acquisition. The Partnership will amortize the Lavaca Acquisition intangibles using the straight-line method over the life of the related reserves within the dedicated acreage and recognize $1.5 million of amortization expense annually.
	Primarily using the income approach to value the intangible assets, the fair value estimates are based on i) an assumed discount rate of 10.5%; ii) present value of estimated future cash flows; iii) estimated timing and amounts of future operating and development costs; iv) forward market prices as of December 2013 for natural gas and crude oil; and v) an increase in throughput volumes through 2019, declining thereafter.
	The Partnership completed a preliminary purchase price allocation to determine the estimated fair value of the acquired assets. The preliminary allocation is subject to various purchase price adjustments, which could impact the allocation presented below. The following table summarizes the preliminary purchase price allocation for the Lavaca Acquisition (in thousands):
	Property, plant and equipment:
	Land	$	2
	Pipelines	58,737
	Equipment	753
	Total property, plant and equipment	59,492
	Intangible assets	44,917
	Total cash consideration	$	104,409
	For the three and nine months ended September 30, 2014, the Lavaca System contributed $4.5 million and $10.6 million of revenue and $2.3 million and $4.5 million of net income, respectively, attributable to the Partnership's Gathering and Processing segment, which are included in the condensed consolidated statement of operations.
	Pro forma financial results are not presented as it is impractical to obtain the necessary information. The seller did not operate the acquired assets as a standalone business and, therefore, historical financial information that is consistent with the operations under the current agreement is not available.
	Other Acquisitions
	Investment in Unconsolidated Affiliate
	On August 11, 2014, the Partnership acquired a 66.7% non-operated interest in MPOG, which is an offshore oil gathering system, for a net purchase price of $12.0 million. The acquisition was financed through the Partnership's credit facility. The interest is accounted for as an equity method investment under ASC 323, Investments-Equity Method and Joint Ventures. Although the Partnership owns a majority interest in MPOG, the ownership structure requires unanimous approval amongst owners on decisions impacting the operation of the assets and any changes in ownership structure. Therefore, the Partnership's voting rights are not proportional to their obligations to absorb losses or receive returns. As such, MPOG is considered a variable interest entity however the Partnership is not the primary beneficiary and as a result does not consolidate MPOG. The Partnership recorded $0.1 million in earnings from unconsolidated affiliate, and received cash distributions of $1.1 million for the three and nine months ended September 30, 2014. The excess of the cash distributions received over the earnings recorded from MPOG is classified as a return of capital within the investing section of our condensed consolidated statement of cash flows.
	Williams Pipeline Acquisition
	In the fourth quarter of 2013, High Point Gas Gathering LLC, a subsidiary of the Partnership, entered into a purchase and sale agreement to acquire natural gas pipeline facilities and interests thereto for approximately $6.5 million that are contiguous to, and connect with, our High Point System in offshore Louisiana (the “Williams Pipeline Acquisition”). The closing of the purchase and sale agreement was subject to FERC approval of the seller's application to abandon by sale to us the pipeline facilities and to permit the facilities to serve a gathering function, exempt from FERC's jurisdiction. The FERC granted approval of the application during the first quarter of 2014, and the purchase and sale agreement closed on March 14, 2014. Total consideration was allocated to pipeline fixed assets using the income approach based on Level 3 inputs.
	Blackwater Terminals Acquisition
	Effective December 17, 2013, we acquired Blackwater Midstream Holdings, LLC ("Blackwater"), which operates 1.7 million barrels of storage capacity across four marine terminal sites located in Westwego, Louisiana; Brunswick, Georgia; Harvey, Louisiana; and Salisbury, Maryland. The acquisition of Blackwater represented a transaction between entities under common control and a change in reporting entity. Transfers of net assets or exchanges of shares between entities under common control are accounted for as if the transfer occurred at the beginning of the period or date of common control, which was April 15, 2013.
	For the three and nine months ended September 30, 2014, Blackwater contributed $3.8 million and $11.3 million of revenue and $0.7 million and $1.1 million of net income, respectively, attributable to the Partnership's Terminals segment, which are included in the condensed consolidated statement of operations.
	Subsequent to the acquisition of Blackwater, for the three and nine months ended September 30, 2013, Blackwater contributed $3.5 million and $6.3 million of revenue and $0.1 million and $0.7 million of net loss, respectively, attributable to the Partnership's Terminals segment, which are included in the condensed consolidated statement of operations.
	High Point System Acquisition
	Effective April 15, 2013, our General Partner contributed to us the High Point System, consisting of 100% of the limited liability company interests in High Point Gas Transmission, LLC and High Point Gas Gathering, LLC. The High Point System entities own midstream assets consisting of approximately 700 miles of natural gas and liquids pipeline assets located in southeast Louisiana, in the Plaquemines and St. Bernard's Parishes, and the shallow water and deep shelf Gulf of Mexico, including the Mississippi Canyon, Viosca Knoll, West Delta, Main Pass, South Pass and Breton Sound zones. Natural gas is collected at more than 75 receipt points that connect hundreds of wells with an emphasis on oil and liquids-rich reservoirs.
	For the three and nine months ended September 30, 2014, the High Point System contributed $6.4 million and $22.4 million of revenue and $2.6 million and $10.4 million of net income, respectively, attributable to the Partnership's Transmission segment, which are included in the condensed consolidated statement of operations.
	Subsequent to the contribution from our General Partner, for the three and nine months ended September 30, 2013, the High Point System contributed $10.7 million and $19.7 million, respectively, of revenue and $1.2 million and $2.7 million, respectively, of net income, attributable to the Partnership's Transmission segment, which are included in the condensed consolidated statement of operations.
	Madison Divestiture
	On March 31, 2014, the Partnership completed the sale of certain gathering and processing assets in Madison County, Texas. We received $6.1 million in cash proceeds related to the sale. The Partnership recognized a $3.0 million impairment charge related to these assets for the year ended December 31, 2013, which wrote down the assets to a carrying value of $6.1 million as of December 31, 2013.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Recent Accounting Pronouncements
	In July 2013, the FASB issued Accounting Standards Update ("ASU ") No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force). This guidance was issued related to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss or a tax credit carryforward exists. The updated guidance requires an entity to net its unrecognized tax benefits against the deferred tax assets for all same jurisdiction net operating loss carryforward, a similar tax loss, or tax credit carryforwards. A gross presentation will be required only if such carryforwards are not available or would not be used by the entity to settle any additional income taxes resulting from disallowance of the uncertain tax position. The update was effective for the Partnership on January 1, 2014 and did not have a material impact on its condensed consolidated financial statements.
	In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. This guidance amends the requirements for reporting discontinued operations and requires expanded disclosures for individually significant components of an entity that either have been disposed of or are classified as held for sale, but do not qualify for discontinued operations reporting. Only those disposals of components of an entity that represent a strategic shift that has (or will have) a major effect on an entity’s operations and financial results will be reported as discontinued operations in the financial statements. ASU 2014-08 is effective for annual periods, and interim periods within those years, beginning on or after December 15, 2014 and is applied prospectively. Early adoption is permitted, but only for disposals or classifications as held for sale that have not been reported in financial statements previously issued or available for issuance. The update was early adopted by the Partnership as of April 1, 2014 and did not have a material impact on its condensed consolidated financial statements.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which amends the existing accounting standards for revenue recognition. The standard requires an entity to recognize revenue in a manner that depicts the transfer of goods or services to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance in ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Partnership is currently evaluating the method of adoption and impact this standard will have on its financial statements and related disclosures.
	In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements-Going Concern (Topic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. This guidance provides additional information to guide management's evaluation of whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued. The update is effective for annual periods beginning on or after December 15, 2016. The Partnership is currently evaluating the impact of this standard on its financial statements and does not believe there will be a material impact.

Discontinued_Operations_Notes

Discontinued Operations (Notes)	9 Months Ended
	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	'
	Discontinued Operations
	We classify long-lived assets to be disposed of through sales that meet specific criteria as held for sale. We cease depreciating those assets effective on the date the asset is classified as held for sale. We record those assets at the lower of their carrying value or the estimated fair value less the cost to sell. Until the assets are disposed of, an estimate of the fair value is re-determined when related events or circumstances change.
	During the second quarter of 2013, the board of directors of our General Partner approved a plan to sell certain non-strategic gathering and processing assets which meet specific criteria, qualifying them as held for sale. Subsequently, as part of the Blackwater Acquisition described in Note 3, we acquired long-lived terminal assets classified as held for sale.
	As a result of the planned divestiture of these non-strategic midstream assets, we have accounted for these disposal groups as discontinued operations within our Gathering and Processing and Terminal segments. Accordingly, we reclassified and excluded the disposal groups' results of operations from our results of continuing operations and reported the disposal groups' results of operations as Loss from operations of disposal groups, net of tax in our accompanying condensed consolidated statement of operations for all periods presented. We did not, however, elect to present separately the operating, investing and financing cash flows related to the disposal groups in our accompanying condensed consolidated statement of cash flows as this activity was immaterial for all periods presented. The following table presents the revenue and expenses and Loss from operations of disposal groups, net of tax associated with the assets classified as held for sale for the three and nine months ended September 30, 2014 and 2013 (in thousands, except per unit amounts):
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
	Revenue	$	13		$	591		$	461		$	1,717
	Expense	(55		)	(606		)	(599		)	(1,801		)
	Loss on impairment of property, plant and equipment	—			—			(673		)	(1,807		)
	Loss on sale of assets	—			—			(87		)	—
	Income tax benefit	16			—			316			—
	Loss from operations of disposal groups, net of tax	$	(26	)	$	(15	)	$	(582	)	$	(1,891	)
	Limited partners' net loss per unit from discontinued operations (basic and diluted)	$	—		$	0.01		$	(0.05	)	$	(0.21	)
	During the second quarter of 2014, the Partnership’s management resolved not to sell a portion of the assets that had previously been reclassified to discontinued operations and assets held for sale in the second quarter of 2013. In accordance with ASC 360, the Partnership reclassified the assets as held and used at the carrying value of the assets before they were classified as held for sale adjusted for depreciation expense that would have been recorded. The Partnership has reclassified the amounts recorded in discontinued operations related to the assets for all prior periods presented, as well as reclassified the assets to held and used on the comparative December 31, 2013 balance sheet.
	The Partnership continues to classify the terminal in Salisbury, Maryland as held for sale as we are continuing negotiations for the sale of those assets in the fourth quarter of 2014, contingent upon the purchaser’s completion of due diligence activities. The Partnership recognized an additional impairment on these assets of $0.7 million ($0.4 million, net of tax) during the nine months ended September 30, 2014, due to deteriorating market conditions. The impairment was the result of an analysis of the carrying value of the assets relative to their estimated fair value using a market based approach less costs to sell.

Concentration_of_Credit_Risk_a

Concentration of Credit Risk and Trade Accounts Receivable	9 Months Ended
	Sep. 30, 2014
Risks and Uncertainties [Abstract]	'
Concentration Risk Disclosure [Text Block]	'
	Concentration of Credit Risk and Trade Accounts Receivable
	Our primary market areas are located in the United States along the Gulf Coast and in the Southeast. We have a concentration of trade receivable balances due from companies engaged in the production, trading, distribution and marketing of natural gas, NGL and condensate products. This concentration of customers may affect our overall credit risk in that the customers may be similarly affected by changes in economic, regulatory or other factors. Generally, our customers’ historical financial and operating information is analyzed prior to extending credit. We manage our exposure to credit risk through credit analysis, credit approvals, credit limits and monitoring procedures, and for certain transactions, we may request letters of credit, prepayments or guarantees. We maintain allowances for potentially uncollectible accounts receivable; however, for the three and nine months ended September 30, 2014 and 2013, no allowances on or write-offs of accounts receivable were recorded.
	The following table summarizes the percentage of revenue earned from those customers that accounted for 10% or more of the Partnership's consolidated revenue in the condensed consolidated statement of operations for the each of the periods presented below:
		Three months ended September 30,				Nine months ended September 30,
		2014		2013		2014		2013
	Customer A	24	%	27	%	26	%	29	%
	Customer B	14	%	13	%	14	%	12	%
	Customer C	10	%	13	%	10	%	13	%
	Customer D	—	%	—	%	10	%	—	%
	Other	52	%	47	%	40	%	46	%
	Total	100	%	100	%	100	%	100	%

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives	'
	Derivatives
	Commodity Derivatives
	To minimize the effect of commodity prices and maintain our cash flow and the economics of our development plans, we enter into commodity hedge contracts from time to time. Those commodity hedge contracts may be in the form of swaps, puts and/or collars. The terms of the contracts depend on various factors, including management’s view of future commodity prices, acquisition economics on purchased assets and future financial commitments. This hedging program is designed to mitigate the effect of commodity price downturns while allowing us to participate in some commodity price upside. Management regularly monitors the commodity markets and financial commitments to determine if, when, and at what level commodity hedging is appropriate in accordance with policies that are established by the board of directors of our General Partner. As of September 30, 2014, the aggregate notional volume of our commodity derivatives was 3.5 million gallons.
	We enter into commodity contracts with multiple counterparties. We may be required to post collateral with our counterparties in connection with our derivative positions. As of September 30, 2014, we have not posted collateral with any counterparty. Our counterparties are not required to post collateral with us in connection with their derivative positions. Netting agreements are in place with our counterparties that permit us to offset our commodity derivative asset and liability positions.
	For accounting purposes, no derivative instruments were designated as hedging instruments and were instead accounted for under the mark-to-market method of accounting, with any changes in the fair value of the derivatives recorded in the condensed consolidated balance sheets and through earnings, rather than being deferred until the anticipated transactions affect earnings. The use of mark-to-market accounting for financial instruments can cause non-cash earnings volatility due to changes in the underlying commodity price indices or interest rates.
	Interest Rate Swap
	We entered into an interest rate swap to manage the impact of the interest rate risk associated with our credit facility, effectively converting a portion of our long-term variable rate debt into fixed rate debt. As of September 30, 2014, the notional amount of our interest rate swap was $100.0 million. The interest rate swap was entered into with a single counterparty and we were not required to post collateral.
	Weather Derivative
	In the second quarters of 2014 and 2013, we entered into weather derivatives to mitigate the impact of potential unfavorable weather to our operations under which we could receive payments totaling up to $10.0 million in the event that a hurricane or hurricanes of certain strength pass through the area as identified in the derivative agreement. The weather derivatives are accounted for using the intrinsic value method, under which the fair value of the contract was zero and any amounts received are recognized as gains during the period received. The weather derivatives were entered into with a single counterparty and we were not required to post collateral.
	We paid premiums of $1.0 million and $1.1 million in 2014 and 2013, respectively, which are recorded as current Risk management assets on the balance sheet and are amortized to Direct operating expenses on a straight-line basis over the one year term of the respective contract. For the weather derivative entered into in the second quarter of 2014, the unamortized amount was approximately $0.6 million as of September 30, 2014. The weather derivative entered into in the second quarter of 2013 was fully amortized as of September 30, 2014.
	As of September 30, 2014 and December 31, 2013, the value associated with our commodity derivatives, interest rate swap, and weather derivative were recorded in our condensed consolidated balance sheets, under the captions as follows (in thousands):
			Gross Risk Management Assets						Gross Risk Management Liabilities							Net Risk Management Assets (Liabilities)
	Balance Sheet Classification		September 30,			December 31, 2013			September 30,				December 31, 2013			September 30,			December 31, 2013
			2014						2014							2014
	Current		$	1,047		$	473		$	—			$	—		$	1,047		$	473
	Noncurrent		—			—			—				—			—			—
	Total assets		$	1,047		$	473		$	—			$	—		$	1,047		$	473
	Current		$	—		$	27		$	(335	)		$	(450	)	$	(335	)	$	(423	)
	Noncurrent		—			—			—				(101		)	—			(101		)
	Total liabilities		$	—		$	27		$	(335	)		$	(551	)	$	(335	)	$	(524	)
	For the three and nine months ended September 30, 2014 and 2013, respectively, the realized and unrealized gains (losses) associated with our commodity derivatives, interest rate swap instrument and weather derivative were recorded in our condensed consolidated statements of operations, under the captions as follows (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		Gain (loss) on derivatives						Gain (loss) on derivatives
	Statement of Operations Classification	Realized			Unrealized			Realized				Unrealized
	2014
	Commodity derivatives	$	(9	)	$	615		$	(191	)		$	474
	Interest expense	(109		)	91			(322		)		118
	Direct operating expenses	(241		)	—			(794		)		—
	Total	$	(359	)	$	706		$	(1,307	)		$	592
	2013
	Commodity derivatives	$	261		$	(760	)	$	797			$	(687	)
	Interest expense	(101		)	(153		)	(101		)		(471		)
	Direct operating expenses	(284		)	—			(378		)		—
	Total	$	(124	)	$	(913	)	$	318			$	(1,158	)

Fair_Value_Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurement	'
	Fair Value Measurement
	The authoritative guidance for fair value measurements establishes a three-tier fair value hierarchy, which prioritizes the inputs used to measure fair value. These tiers include:
	•	Level 1 – Inputs represent unadjusted quoted prices in active markets for identical assets or liabilities;
	•	Level 2 – Inputs include quoted prices for similar assets and liabilities in active markets that are either directly or indirectly observable; and
	•	Level 3 – Inputs are unobservable and considered significant to fair value measurement.
	A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of assets and liabilities within the fair value hierarchy.
	We believe the carrying amount of cash and cash equivalents approximates fair value because of the short-term maturity of these instruments. Our cash and cash equivalents would be classified as Level 1 under the fair value hierarchy.
	The recorded value of the amounts outstanding under the credit facility approximates its fair value, as interest rates are variable, based on prevailing market rates and the short-term nature of borrowings and repayments under the credit facility. Our existing revolving credit facility would be classified as Level 1 under the fair value hierarchy.
	The fair value of all derivatives instruments is estimated using a market valuation methodology based upon forward commodity price curves, volatility curves as well as other relevant economic measures, if necessary. Discount factors may be utilized to extrapolate a forecast of future cash flows associated with long dated transactions or illiquid market points. The inputs are obtained from independent pricing services, and we have made no adjustments to the obtained prices.
	We have consistently applied these valuation techniques in all periods presented and believe we have obtained the most accurate information available for the types of derivatives contracts held.
	Fair Value of Financial Instruments
	The following table sets forth by level within the fair value hierarchy, our commodity derivative instruments and interest rate swap, included as part of Risk management assets and Risk management liabilities within the condensed consolidated balance sheet, that were measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013 (in thousands):
		Carrying			Estimated Fair Value
		Amount			Level 1		Level 2			Level 3		Total
	Commodity derivative instruments, net
	September 30, 2014	$	404		$	—	$	404		$	—	$	404
	December 31, 2013	(70		)	—		(70		)	—		(70		)
	Interest rate swap
	30-Sep-14	$	(335	)	$	—	$	(335	)	$	—	$	(335	)
	31-Dec-13	(454		)	—		(454		)	—		(454		)
	The premium paid to enter the weather derivative described in Note 6 "Derivatives" is included within Risk management assets on the condensed consolidated balance sheet but is not included as part of the above table as it is recorded at amortized carrying cost, not fair value.

Property_Plant_and_Equipment

Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment	'
	Property, Plant and Equipment
	Property, plant and equipment, net, as of September 30, 2014 and December 31, 2013 were as follows (in thousands):
		Useful Life	September 30,			December 31,
		(in years)	2014			2013
	Land	N/A	$	6,133		$	6,015
	Construction in progress	N/A	44,707			6,443
	Base gas	N/A	1,108			1,108
	Buildings and improvements	4 to 40	5,522			5,109
	Processing and treating plants	8 to 40	98,291			97,106
	Pipelines	5 to 40	304,771			239,865
	Compressors	4 to 20	18,185			11,955
	Dock	20 to 40	8,004			7,942
	Tanks, truck rack and piping	20 to 40	24,390			22,432
	Equipment	8 to 20	8,645			6,294
	Computer software	5	3,696			3,531
	Total property, plant and equipment		523,452			407,800
	Accumulated depreciation		(107,653		)	(95,099		)
	Property, plant and equipment, net		$	415,799		$	312,701
	Of the gross property, plant and equipment balances at September 30, 2014 and December 31, 2013, $101.5 million and $100.5 million, respectively, were related to AlaTenn, Midla and HPGT, our FERC regulated interstate and intrastate assets.
	Capitalized interest was $0.3 million and less than $0.1 million for the three months ended September 30, 2014 and 2013, respectively, and $0.4 million and $0.1 million for the nine months ended September 30, 2014 and 2013, respectively.
	Depreciation expense was $4.6 million and $6.5 million for the three months ended September 30, 2014 and 2013, respectively, and $15.7 million and $18.9 million for the nine months ended September 30, 2014 and 2013, respectively.

Asset_Retirement_Obligations_N

Asset Retirement Obligations (Notes)	9 Months Ended
	Sep. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]	'
Asset Retirement Obligation Disclosure [Text Block]	'
	9. Asset Retirement Obligations
	We record a liability for the fair value of asset retirement obligations and conditional asset retirement obligations that we can reasonably estimate, on a discounted basis, in the period in which the liability is incurred. We collectively refer to asset retirement obligations and conditional asset retirement obligations as ARO.
	Certain assets related to our Transmission segment have regulatory obligations to perform remediation and, in some instances, dismantlement and removal activities when the assets are abandoned. These asset retirement obligations include varying levels of activity including disconnecting inactive assets from active assets, cleaning and purging assets, and in some cases, completely removing the assets and returning the land to its original state. These assets have been in existence for many years and with regular maintenance will continue to be in service for many years to come. It is not possible to predict when demand for these transmission services will cease, and we do not believe that such demand will cease for the foreseeable future. A portion of our regulatory obligations is related to assets that we plan to take out of service.
	No assets were legally restricted for purposes of settling our ARO liabilities during the nine months ended September 30, 2014. The following table is a reconciliation of the asset retirement obligations (in thousands):
		September 30, 2014
	Beginning asset retirement obligation	$	34,636
	Liabilities assumed	248
	Expenditures	(690		)
	Accretion expense	588
	Ending asset retirement obligation	$	34,782
	We are required to establish security against any potential secondary obligations relating to the abandonment of certain transmission assets that may be imposed on the previous owner by applicable regulatory authorities. As such, we have a restricted cash account that is established, held and maintained by a third party that amounts to $3.0 million and is presented in Other assets, net in our consolidated balance sheet as of September 30, 2014.

Debt_Obligations

Debt Obligations	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Debt Obligations	'
	Debt Obligations
	On September 5, 2014, the Partnership entered into an amended and restated credit agreement (the "Credit Agreement"), which provides for a maximum borrowing equal to $500.0 million, with the ability to further increase the borrowing capacity subject to lender approval. The Credit Agreement contains certain financial covenants, including the requirement that our indebtedness not exceed 4.75 times adjusted consolidated EBITDA (except for the current and subsequent two quarters after the consummation of a permitted acquisition, at which time the covenant is increased to 5.25 times adjusted Consolidated EBITDA). We can elect to have loans under our credit facility bear interest either at a Eurodollar-based rate plus a margin ranging from 2.00% to 3.25% depending on our total leverage ratio then in effect, or a base rate which is a fluctuating rate per annum equal to the highest of (a) the Federal Funds Rate plus 0.50%, (b) the rate of interest in effect for such day as publicly announced from time to time by Bank of America as its “prime rate”, or (c) the Eurodollar Rate plus 1.00% plus a margin ranging from 1.00% to 2.25% depending on the total leverage ratio then in effect. We also pay a maximum commitment fee of 0.50% per annum on the undrawn portion of the revolving loan.
	Our obligations under the Credit Agreement are secured by a first mortgage in favor of the lenders in the majority of our real property. Advances made under the Credit Agreement are guaranteed on a senior unsecured basis by certain of our subsidiaries (the “Guarantors”). These guarantees are full and unconditional and joint and several among the Guarantors. The terms of the new credit facility include covenants that restrict our ability to make cash distributions and acquisitions in some circumstances. The remaining principal balance of loans and any accrued and unpaid interest will be due and payable in full on the maturity date, which is September 5, 2016.
	The Credit Agreement also contains customary representations and warranties (including those relating to organization and authorization, compliance with laws, absence of defaults, material agreements and litigation) and customary events of default (including those relating to monetary defaults, covenant defaults, cross defaults and bankruptcy events). The primary financial covenants contained in the credit facility are i) a total consolidated leverage ratio test (not to exceed 4.75 times in the absence of a permitted acquisition) and ii) a minimum interest coverage ratio test (not less than 2.50).
	For the nine months ended September 30, 2014 and 2013, the weighted average interest rate on borrowings under our Credit Agreement was approximately 4.38% and 4.50%, respectively.
	As of September 30, 2014, we had approximately $57.7 million of outstanding borrowings under our credit facility. Our consolidated total leverage calculation pursuant to the Credit Agreement was 1.49 times resulting in approximately $135.2 million of available borrowing capacity as of September 30, 2014.
	Other debt
	Other debt represents insurance premium financing in the original amount of $2.5 million bearing interest at 3.95% per annum, which is repayable in equal monthly installments of approximately $0.3 million through the third quarter of 2014.
	Our outstanding borrowings at September 30, 2014 and December 31, 2013, respectively, were (in thousands):
		September 30,		December 31,
		2014		2013
	Revolving credit facility	$	57,700	$	130,735
	Other debt	1		2,048
	Total debt	57,701		132,783
	Less: current portion	1		2,048
	Long-term debt	$	57,700	$	130,735
	At September 30, 2014 and December 31, 2013, letters of credit outstanding under the credit facility totaled $4.2 million and $4.8 million, respectively.
	In connection with our credit facility and amendments thereto, we have incurred $10.1 million of debt issuance costs inception to date that are being amortized on a straight-line basis over the term of the credit facility. In connection with the amendment and restatement of our Credit Agreement, discussed above, the Partnership recognized $0.7 million in extinguishment costs during the quarter ended September 30, 2014, which is included in Other expense in our condensed consolidated statement of operations.

Partners_Capital

Partners' Capital	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Partners' Capital	'
	Partners’ Capital and Convertible Preferred Units
	Our capital accounts are comprised of approximately 1.3% general partner interests and 98.7% limited partner interests. Our limited partners have limited rights of ownership as provided for under our partnership agreement and the right to participate in our distributions. Our General Partner manages our operations and participates in our distributions, including certain incentive distributions pursuant to the Incentive Distribution Rights that are non-voting limited partner rights held by our General Partner.
	Series B Units
	Effective January 31, 2014, the Partnership created and issued to its General Partner 1,168,225 Series B Units. The Series B Units participate in distributions of the Partnership along with common units, with such distributions being made in cash distributions or with paid-in-kind Series B Units at the election of the Partnership. The Series B Units are entitled to vote along with common unitholders and such units will automatically convert to common units two years after the issuance date. Proceeds from the issuance of the Series B Units were used to partially fund the Lavaca Acquisition.
	During 2014, the Partnership has elected to pay the Series B distributions using paid-in-kind Series B Units. The number of paid-in-kind Series B Units is determined by the quotient of: i) the number of Series B Units outstanding at the record date multiplied by the distribution amount declared to Common Unit Holders (“Series B Unit Distribution Amount”), and ii) the Series B Unit Distribution Amount divided by the original issue price of the Series B Units. The Partnership records the paid-in-kind Series B Units at fair value at the time of issuance. The fair value measurement uses our unit price as a significant input in the determination of the fair value and thus represents a Level 2 measurement as defined by ASC 820. For the nine months ended September 30, 2014, the Partnership issued 63,972 of paid-in-kind Series B Units with a fair value of $1.7 million.
	Equity Offerings
	On January 29, 2014, the Partnership and certain of its affiliates entered into an underwriting agreement (the “Underwriting Agreement”) with Barclays Capital Inc. and UBS Securities LLC (the “Underwriters”), providing for the issuance and sale by the Partnership, and the purchase by the Underwriter, of 3,400,000 common units representing limited partner interests in the Partnership at a price to the public of $26.75 per common unit. The Partnership used the net proceeds of $86.9 million to fund a portion of the Lavaca Acquisition.
	On July 14, 2014, the Partnership entered into a common unit purchase agreement with certain institutional investors, which was subsequently amended on August 15, 2014, to provide for the sale of 4,622,352 common units representing limited partner interests in the Partnership in a private placement at a price of $25.8075 per common unit (reflecting an adjustment for the Partnership's second quarter distribution of $0.4625 per unit), for cash consideration of $119.3 million.
	General Partner Units
	In connection with the equity offerings discussed above, we received proceeds of $3.0 million from our General Partner as consideration for 113,131 additional general partner units.
	Issuance and Exercise of Warrant
	Effective February 5, 2014, we issued to our General Partner a warrant to purchase up to 300,000 common units of the Partnership at an exercise price of $0.01 per common unit (the “Warrant”). The Warrant was exercised on February 21, 2014, resulting in the issuance of approximately 300,000 common units. The value of the Warrant of $7.2 million was determined based on the close price of $23.89 of the common units on the exercise date.
	The numbers of units outstanding as of September 30, 2014 and December 31, 2013, respectively, were as follows (in thousands):
		September 30,			December 31,
		2014			2013
	Series A convertible preferred units	5,586			5,279
	Series B convertible units	1,232			—
	Limited partner common units	15,771			7,414
	General partners units	299			185
	Distributions
	We made cash distributions of $5.8 million and $19.5 million, inclusive of distributions of $0.5 million and $1.5 million in respect of our General Partner’s incentive distribution rights, in the three and nine months ended September 30, 2014, respectively. We made distributions of $4.7 million and $12.5 million in the three and nine months ended September 30, 2013, respectively. We made no distributions in respect of our General Partner's incentive distribution rights in the nine months ended September 30, 2013. We depend on our credit facility for future capital needs and may use it to fund a portion of cash distributions to unitholders, as necessary, depending on the level and timing of our operating cashflow.
	The Partnership executed an amendment to the Partnership agreement, which became effective July 24, 2014, related to its outstanding Series A Units. As a result of the Amendment, distributions on Series A Units will be made with paid-in-kind Series A Units, cash or a combination thereof, at the discretion of the Board of Directors, which began with the distribution for the three months ended June 30, 2014 and will continue through the distribution for the quarter ended March 31, 2015. Prior to the Amendment, the Partnership was required to pay distributions on the Series A Units with a combination of paid-in-kind units and cash. For the Series A Unit distributions for the three months ended September 30, 2014, we have accrued $4.2 million for the paid-in-kind Series A Units. The distributions will be made in the fourth quarter of 2014.
	Net Income (Loss) attributable to Limited Partner Units
	Net income (loss) is allocated to the General Partner and the limited partners in accordance with their respective ownership percentages, after giving effect to contractual distributions on Series A preferred convertible units, declared distributions on the Series B Units, limited partner and to the general partner units, including incentive distribution rights. Basic and diluted net income (loss) per limited partner unit is calculated by dividing limited partners’ interest in net income (loss) by the weighted average number of outstanding limited partner units during the period.
	We compute earnings per unit using the two-class method. The two-class method requires that securities that meet the definition of a participating security be considered for inclusion in the computation of basic earnings per unit. Under the two-class method, earnings per unit is calculated as if all of the earnings for the period were distributed under the terms of the partnership agreement, regardless of whether the General Partner has discretion over the amount of distributions to be made in any particular period, whether those earnings would actually be distributed during a particular period from an economic or practical perspective, or whether the General Partner has other legal or contractual limitations on its ability to pay distributions that would prevent it from distributing all of the earnings for a particular period.
	The two-class method does not impact our overall net income (loss) or other financial results; however, in periods in which aggregate net income exceeds our aggregate distributions for such period, it will have the impact of reducing net income (loss) per limited partner unit. This result occurs as a larger portion of our aggregate earnings, as if distributed, is allocated to the incentive distribution rights of the General Partner, even though we make distributions on the basis of available cash and not earnings. In periods in which our aggregate net income does not exceed our aggregate distributions for such period, the two-class method does not have any impact on our calculation of earnings per limited partner unit. We have no dilutive securities, therefore basic and diluted net income per unit are the same.
	We determined basic and diluted net income (loss) per limited partner unit as follows, (in thousands, except per unit amounts):
		Three months ended September 30,							Nine months ended September 30,
		2014				2013			2014			2013
	Net loss from continuing operations	$	(2,397	)		$	(2,526	)	$	(2,934	)	$	(25,972	)
	Less: Net income attributable to noncontrolling interests	33				190			207			533
	Net loss from continuing operations attributable to the Partnership	(2,430		)		(2,716		)	(3,141		)	(26,505		)
	Less:
	Contractual distributions on Series A Units	4,165				2,873			11,263			20,899
	Declared distributions on Series B Units	619				—			1,671			—
	General partner's distribution	603				80			1,688			240
	General partner's share in undistributed loss	(169		)		(290		)	(430		)	(1,610		)
	Net loss from continuing operations available to limited partners	(7,648		)		(5,379		)	(17,333		)	(46,034		)
	Net loss from operations of disposal groups, net of tax, available to limited partners	(26		)		38			(574		)	(1,742		)
	Net loss available to limited partners	$	(7,674	)		$	(5,341	)	$	(17,907	)	$	(47,776	)
	Weighted average number of units used in computation of limited partners’ net (loss) income per unit (basic and diluted)	13,204				6,663			11,409			8,334
	Limited partners' net loss per common unit
	Basic and diluted:
	Loss from continuing operations	$	(0.58	)		$	(0.81	)	$	(1.52	)	$	(5.52	)
	Loss from discontinued operations	—				0.01			(0.05		)	(0.21		)
	Net loss	$	(0.58	)		$	(0.80	)	$	(1.57	)	$	(5.73	)

LongTerm_Incentive_Plan

Long-Term Incentive Plan	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Long-Term Incentive Plan	'
	Long-Term Incentive Plan
	Our General Partner manages our operations and activities and employs the personnel who provide support to our operations. The board of directors of our General Partner provides a long-term incentive plan (“LTIP”) for its employees, consultants and directors who perform services for it or its affiliates. At September 30, 2014 and December 31, 2013, 693,410 and 855,089 units, respectively, were available for future grant under the LTIP.
	Ownership in the awards is subject to forfeiture until the vesting date. The LTIP is administered by the board of directors of our General Partner which, at its discretion, may elect to settle such vested phantom units with a number of units equivalent to the fair market value at the date of vesting in lieu of cash. Although our General Partner has the option to settle in cash upon the vesting of phantom units, it does not currently intend to settle these awards in cash. Although other types of awards are contemplated under the LTIP, all currently outstanding awards are phantom units without distribution equivalent rights.
	Generally, grants issued under the LTIP vest in increments of 25% on each of the first four anniversary dates of the date of the grant and do not contain any other restrictive conditions related to vesting other than continued employment.
	The following table summarizes the change in our unit-based awards during the nine months ended September 30, 2014 indicated, in units:
		Nine months ended September 30, 2014
		Shares		Weighted-Average Exercise Price
	Outstanding at beginning of period	75,529		17.62
	Granted	183,163		20.68
	Forfeited	(12,009	)	18.28
	Vested	(43,986	)	20.72
	Outstanding at end of period	202,697		19.67
	The fair value of our phantom units, which are subject to equity classification, is based on the fair value of our units at the grant date. Compensation costs related to these awards, including amortization, for the three months ended September 30, 2014 and 2013 were $0.3 million and $0.4 million, respectively, and for the nine months ended September 30, 2014 and 2013 were $1.1 million and $1.9 million, respectively, which are classified as Equity compensation expense in the condensed consolidated statements of operations and the non-cash portion in partners’ capital on the condensed consolidated balance sheets.
	The total fair value of vested units at the time of vesting was $1.2 million and $1.6 million for the nine months ended September 30, 2014 and 2013, respectively.
	The total compensation cost related to unvested awards not yet recognized at September 30, 2014 and 2013 was $3.4 million and $1.1 million, respectively, and the weighted average period over which this cost is expected to be recognized as of September 30, 2014 is approximately 3.3 years.

Income_Tax_Notes

Income Tax (Notes)	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	Income Taxes
	The Partnership is not a taxable entity for U.S. federal income tax purposes or for the majority of states that impose an income tax. Taxes on our net income generally are borne by our unitholders through the allocation of taxable income. However, one of our subsidiaries, Blackwater, is a taxable entity. Partnership income tax expense for the three and nine months ended September 30, 2014 was $0.1 million and $0.3 million, respectively, resulting in an effective tax rate of 5.4% and 9.7%, respectively. For the three and nine months ended September 30, 2013, Partnership income tax was a benefit of $0.2 million and $0.6 million, resulting in an effective tax rate of 7.8% and 2.2%, respectively.
	The effective tax rates for the three and nine months ended September 30, 2014 and September 30, 2013, differ from the statutory rate primarily due to Partnership income and loss that is not subject to U. S. federal income taxes, as well as transactions between the Partnership and its taxable subsidiary that generate tax deductions for the taxable subsidiary, which are eliminated in the consolidation of Net loss before income tax (expense) benefit.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies Disclosure [Text Block]	'
	Commitments and Contingencies
	Resolution of legal matter
	In January 2009, Rigolets Limited Partnership (“Rigolets”) filed suit for damages alleging failure to maintain a right-of-way along our Gloria System. Following negotiations, we expect to enter into an agreement with Rigolets during the fourth quarter of 2014 for the procurement of additional needed pipeline right-of-way and permits in order to rebuild sections of the levees and dams which will provide additional protection to portions of our Gloria System. We expect to incur up to $1.8 million of capital expenditures over the next twelve months in connection with this rebuilding.
	Legal proceedings
	On September 5, 2013, HPIP, our General Partner and the Partnership were named as defendants in an action filed by AIM challenging the Equity Restructuring. AIM Midstream Holdings, LLC v. High Point Infrastructure Partners, LLC, American Midstream GP, LLC and American Midstream Partners, LP (Civil Action No. 8803-VCP) was filed in the Court of Chancery of the State of Delaware. Among claims against the other parties to the litigation, the action asserts a claim of tortious interference with contract against the Partnership and sought either rescission of the Partnership's equity restructuring agreement executed on August 9, 2013 or, in the alternative, monetary damages.
	On February 5, 2014, we, HPIP and our General Partner entered into a settlement (the “Settlement”) with AIM Midstream Holdings regarding the action filed in Delaware Chancery Court by AIM Midstream Holdings. Under the Settlement, among other things:
	•	HPIP and AIM Midstream Holdings amended the LLC Amendment to, among other things, amend the Sharing Percentages (as defined therein) such that HPIP’s sharing percentage thereafter is 95% and AIM Midstream Holdings’s Sharing Percentage is 5%;
	•	HPIP transferred all of the 85.02% of our outstanding new IDRs held by HPIP to our General Partner such that our General Partner owns 100% of the outstanding new IDRs; and
	•	We issued to AIM Midstream Holdings a warrant to purchase up to 300,000 common units of the Partnership at an exercise price of $0.01 per common unit, which Warrant, among other terms, i) was exercisable at any time on or after February 8, 2014 until the tenth anniversary of February 5, 2014, ii) contained cashless exercise provisions and iii) contains customary anti-dilution and other protections. The Warrant was exercised on February 21, 2014.
	Environmental matters
	We are subject to federal and state laws and regulations relating to the protection of the environment. Environmental risk is inherent to natural gas pipeline and processing operations, and we could, at times, be subject to environmental cleanup and enforcement actions. We attempt to manage this environmental risk through appropriate environmental policies and practices to minimize any impact our operations may have on the environment.
	Regulatory matters
	On October 8, 2014, the Partnership reached an agreement in principle regarding its Midla interstate pipeline that traverses Louisiana and Mississippi. The parties involved reached the agreement in principle in order to provide continued service to Midla’s customers while addressing safety concerns with the existing pipeline.
	Midla and the parties agreed that Midla may retire the existing 1920s vintage pipeline and replace the existing natural gas service with a new pipeline from Winnsboro, Louisiana to Natchez, Mississippi (the “Natchez Line”) to serve existing residential, commercial, and industrial customers. Customers not served by the new Natchez Line will be connected to other interstate or intrastate pipelines, other gas distribution systems, or offered conversion to propane service. The agreement is subject to final agreements and ongoing proceedings at the Federal Energy Regulatory Commission (“FERC”).
	Under the agreement in principle and subject to FERC approval, Midla will execute long-term agreements to recover its investment in the Natchez Line.

RelatedParty_Transactions

Related-Party Transactions	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related-Party Transactions	'
	Related-Party Transactions
	Employees of our General Partner are assigned to work for us. Where directly attributable, the costs of all compensation, benefits expenses and employer expenses for these employees are charged directly by our General Partner to American Midstream, LLC, which, in turn, charges the appropriate subsidiary. Our General Partner does not record any profit or margin for the administrative and operational services charged to us. During the three and nine months ended September 30, 2014, administrative and operational services expenses of $5.7 million and $15.9 million, respectively, were charged to us by our General Partner. During the three and nine months ended September 30, 2013, administrative and operational services expenses of $3.3 million and $10.3 million, respectively, were charged to us by our General Partner. For the three and nine months ended September 30, 2014, we incurred approximately $0.2 million and $1.0 million, respectively, of costs primarily associated with certain business development activities led by an affiliate of our General Partner. For the three and nine months ended September 30, 2013, we incurred approximately $0.2 million and $0.6 million, respectively, of costs primarily associated with certain business development activities led by an affiliate of our General Partner. We expect to be reimbursed by this affiliate of our General Partner for the business development costs related to those projects.
	During the second quarter, the Partnership and an affiliate of its General Partner entered into a Management Service Fee arrangement under which the affiliate pays a monthly fee to reimburse the Partnership for administrative expenses incurred on the affiliate's behalf. During the three and nine months ended September 30, 2014, the Partnership recognized $0.2 million and $0.3 million, respectively, in management fee income that has been recorded as a reduction to Selling, general and administrative expenses.

Reporting_Segments

Reporting Segments	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Reporting Segments	'
	Reporting Segments
	Our operations are located in the United States and are organized into three reporting segments: (1) Gathering and Processing, (2) Transmission and (3) Terminals.
	Gathering and Processing
	Our Gathering and Processing segment provides “wellhead-to-market” services to producers of natural gas and oil, which include transporting raw natural gas from various receipt points through gathering systems, treating the raw natural gas, processing raw natural gas to separate the NGLs from the natural gas, fractionating NGLs, and selling or delivering pipeline-quality natural gas as well as NGLs to various markets and pipeline systems.
	Transmission
	Our Transmission segment transports and delivers natural gas from producing wells, receipt points or pipeline interconnects for shippers and other customers, which include local distribution companies (“LDCs”), utilities and industrial, commercial and power generation customers.
	Terminals
	Our Terminals segment provides above-ground storage services at our marine terminals that support various commercial customers, including commodity brokers, refiners and chemical manufacturers to store a range of products, including chemicals, distillates, and agricultural products.
	These segments are monitored separately by management for performance and are consistent with internal financial reporting. These segments have been identified based on the differing products and services, regulatory environment and the expertise required for these operations. Gross margin is a performance measure utilized by management to monitor the business of each segment.
	The following tables set forth our segment information for the three and nine months ended September 30, 2014 and 2013 (in thousands):
		Three months ended September 30, 2014
		Gathering			Transmission		Terminals		Total
		and
		Processing
	Revenue	$	45,569		$	20,328	$	3,802	$	69,699
	Loss on commodity derivatives, net	606			—		—		606
	Total revenue	46,175			20,328		3,802		70,305
	Operating expenses:
	Purchases of natural gas, NGL's and condensate	35,024			11,666		—		46,690
	Direct operating expenses	5,249			5,033		1,602		11,884
	Selling, general and administrative expenses								5,875
	Equity compensation expense								337
	Depreciation, amortization and accretion expense								5,706
	Total operating expenses								70,492
	Loss on sale of assets, net								(103		)
	Other expense								(672		)
	Interest expense								(1,430		)
	Earnings in unconsolidated affiliate								117
	Income tax expense								(122		)
	Loss from operations of disposal groups, net of tax								(26		)
	Net loss								(2,423		)
	Less: Net income attributable to non-controlling interests								33
	Net loss attributable to the Partnership								$	(2,456	)
	Segment gross margin (a)	$	10,513		$	8,619	$	2,200	$	21,332
		Three months ended September 30, 2013
		Gathering			Transmission		Terminals		Total
		and
		Processing
	Revenue	$	52,082		$	22,478	$	3,458	$	78,018
	Gain on commodity derivatives, net	(499		)	—		—		(499		)
	Total revenue	51,583			22,478		3,458		77,519
	Operating expenses:
	Purchases of natural gas, NGL's and condensate	41,180			14,585		—		55,765
	Direct operating expenses	3,805			3,994		1,293		9,092
	Selling, general and administrative expenses								4,494
	Equity compensation expense								392
	Depreciation, amortization and accretion expense								7,880
	Total operating expenses								77,623
	Interest expense								(2,636		)
	Income tax benefit								214
	Loss from operations of disposal groups, net of tax								(15		)
	Net loss								(2,541		)
	Less: Net income attributable to non-controlling interests								190
	Net loss attributable to the Partnership								$	(2,731	)
	Segment gross margin (a)	$	10,879		$	7,864	$	2,165	$	20,908
		Nine months ended September 30, 2014
		Gathering			Transmission		Terminals		Total
		and
		Processing
	Revenue	$	147,209		$	69,417	$	11,314	$	227,940
	Loss on commodity derivatives, net	283			—		—		283
	Total revenue	147,492			69,417		11,314		228,223
	Operating expenses:
Purchases of natural gas, NGL's and condensate	115,383			40,346		—		155,729
Direct operating expenses	15,163			11,887		4,839		31,889
Selling, general and administrative expenses								17,105
Equity compensation expense								1,132
Depreciation, amortization and accretion expense								19,350
Total operating expenses								225,205
Loss on sale of assets, net								(124		)
Other expense								(672		)
Interest expense								(5,013		)
Earnings in unconsolidated affiliate								117
Income tax expense								(260		)
Loss from operations of disposal groups, net of tax								(582		)
Net loss								(3,516		)
Less: Net income attributable to non-controlling interests								207
Net loss attributable to the Partnership								$	(3,723	)
Segment gross margin (a)	$	31,122		$	28,983	$	6,475	$	66,580
	Nine months ended September 30, 2013
	Gathering			Transmission		Terminals		Total
	and
	Processing
Revenue	$	154,336		$	56,539	$	6,326	$	217,201
Loss on commodity derivatives, net	110			—		—		110
Total revenue	154,446			56,539		6,326		217,311
Operating expenses:
Purchases of natural gas, NGL's and condensate	125,888			37,110		—		162,998
Direct operating expenses	10,924			8,943		2,502		22,369
Selling, general and administrative expenses								12,507
Equity compensation expense								1,877
Depreciation, amortization and accretion expense								22,274
Total operating expenses								222,025
Gain on involuntary conversion of property, plant and equipment								343
Loss on impairment of property, plant and equipment								(15,232		)
Interest expense								(6,958		)
Income tax benefit								589
Loss from operations of disposal groups, net of tax								(1,891		)
Net loss								(27,863		)
Less: Net income attributable to non-controlling interests								533
Net loss attributable to the Partnership								$	(28,396	)
Segment gross margin (a)	$	28,812		$	19,296	$	3,824	$	51,932
(a)	Segment gross margin for our Gathering and Processing segment consists of revenue less purchases of natural gas, NGLs and condensate and revenue from construction, operating and maintenance agreements (“COMA”). Segment gross margin for our Transmission segment consists of revenue, less purchases of natural gas and COMA. Segment gross margin for our Terminals segment consists of revenue, less direct operating expenses. Gross margin consists of the sum of the segment gross margin amounts for each of these segments. As an indicator of our operating performance, gross margin should not be considered an alternative to, or more meaningful than, net income or cash flow from operations as determined in accordance with GAAP. Our gross margin may not be comparable to a similarly titled measure of another company because other entities may not calculate gross margin in the same manner.
Asset information, including capital expenditures, by segment is not included in reports used by our management in their monitoring of performance and therefore is not disclosed.

Subsidiary_Guarantors_Notes

Subsidiary Guarantors (Notes)	9 Months Ended
	Sep. 30, 2014
Subsidiary Guarantors [Abstract]	'
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	'
	Subsidiary Guarantors
	Certain of the subsidiaries of the Partnership (the "Subsidiaries") are co-registrants with the Partnership on registration statement No. 333-183818, and the registration statement registers guarantees of debt securities by one or more of the Subsidiaries (other than American Midstream Finance Corporation, a 100% owned subsidiary of the Partnership whose sole purpose is to act as co-issuer of such debt securities). The financial position and operations of the co-issuer are minor and therefore have been included with the Parent's financial information. As of June 30, 2012, the Subsidiaries were 100% owned by the Partnership and any guarantees by the Subsidiaries will be full and unconditional. As of September 30, 2014, the Subsidiaries have an investment in the non-guarantor subsidiaries equal to a 92.2% undivided interest in its Chatom System. The Partnership has no assets or operations independent of the Subsidiaries, and there are no significant restrictions upon the ability of the Subsidiaries to distribute funds to the Partnership. In the event that more than one of the Subsidiaries provide guarantees of any debt securities issued by the Partnership, such guarantees will constitute joint and several obligations. None of the assets of the Partnership or the Subsidiaries represent restricted net assets pursuant to Rule 4-08(e)(3) of Regulation S-X under the Securities Act of 1933, as amended. For purposes of the following condensed consolidating financial information, the Partnership's investments in its Subsidiaries and the guarantor subsidiaries' investment in its 92.2% undivided interest in the Chatom System are presented in accordance with the equity method of accounting. The financial information may not necessarily be indicative of the financial position, results of operations, or cash flows had the subsidiary guarantors operated as independent entities. Condensed consolidating financial information for the Partnership, its combined guarantor subsidiaries and non-guarantor subsidiary as of September 30, 2014 and December31, 2013, and for the three and nine months ended September 30, 2014 and 2013is as follows (in thousands):
		Condensed Consolidating Balance Sheet
		30-Sep-14
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
	Assets
	Current assets
	Cash and cash equivalents	$	1		$	458		$	—		$	—			$	459
	Accounts receivable	—			5,243			2,187			—				7,430
	Unbilled revenue	—			17,747			3,524			—				21,271
	Risk management assets	—			1,047			—			—				1,047
	Other current assets	—			4,323			392			—				4,715
	Current assets held for sale	—			29			—			—				29
	Total current assets	1			28,847			6,103			—				34,951
	Property, plant and equipment, net	—			358,413			57,386			—				415,799
	Note receivable	27,315			—			—			(27,315		)		—
	Goodwill	—			16,253			—			—				16,253
	Intangible assets, net	—			45,585			—			—				45,585
	Investment in unconsolidated affiliate	—			11,017			—			—				11,017
	Other assets, net	—			10,212			983			—				11,195
	Noncurrent assets held for sale, net	—			1,164			—			—				1,164
	Investment in subsidiaries	357,765			56,969			—			(414,734		)		—
	Total assets	$	385,081		$	528,460		$	64,472		$	(442,049	)		$	535,964
	Liabilities, Equity and Partners’ Capital
	Current liabilities
	Accounts payable	$	59		$	12,242		$	125		$	—			$	12,426
	Accrued gas purchases	—			12,798			1,964			—				14,762
	Accrued expenses and other current liabilities	—			21,026			399			—				21,425
	Current portion of long-term debt	—			1			—			—				1
	Risk management liabilities	—			335			—			—				335
	Current liabilities held for sale	—			1			—			—				1
	Total current liabilities	59			46,403			2,488			—				48,950
	Risk management liabilities - long-term	—			—			—			—				—
	Asset retirement obligations	—			34,300			482			—				34,782
	Other liabilities	—			161			—			—				161
	Long-term debt	—			85,015			—			(27,315		)		57,700
	Deferred tax liability	—			4,816			—			—				4,816
	Noncurrent liabilities held for sale, net	—			—			—			—				—
	Total liabilities	59			170,695			2,970			(27,315		)		146,409
	Convertible preferred units
	Series A convertible preferred units	104,736			—			—			—				104,736
	Total partners’ capital	280,286			357,765			56,969			(414,734		)		280,286
	Noncontrolling interests	—			—			4,533			—				4,533
	Total equity and partners' capital	280,286			357,765			61,502			(414,734		)		284,819
	Total liabilities, equity and partners' capital	$	385,081		$	528,460		$	64,472		$	(442,049	)		$	535,964
		Condensed Consolidating Balance Sheet
		31-Dec-13
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
	Assets
	Current assets
	Cash and cash equivalents	$	1		$	392		$	—		$	—			$	393
	Accounts receivable	—			4,461			2,361			—				6,822
	Unbilled revenue	—			18,321			4,680			—				23,001
	Risk management assets	—			473			—			—				473
	Other current assets	84			6,942			555			(84		)		7,497
	Current assets held for sale	—			272			—			—				272
	Total current assets	85			30,861			7,596			(84		)		38,458
	Risk management assets, long-term	—			—			—			—				—
	Property, plant and equipment, net	—			254,656			58,045			—				312,701
	Note receivable	27,315			—			—			(27,315		)		—
	Goodwill	—			16,447			—			—				16,447
	Intangible assets, net	—			3,682			—			—				3,682
	Other assets, net	—			8,321			743			—				9,064
Noncurrent assets held for sale, net	—			1,723			—			—				1,723
Investment in subsidiaries	142,758			57,750			—			(200,508		)		—
Total assets	$	170,158		$	373,440		$	66,384		$	(227,907	)		$	382,075
Liabilities, Equity and Partners’ Capital
Current liabilities
Accounts payable	$	30		$	2,902		$	329		$	—			$	3,261
Accrued gas purchases	—			14,282			3,104			—				17,386
Accrued expenses and other current liabilities	1,478			13,563			101			(84		)		15,058
Current portion of long-term debt	—			2,048			—			—				2,048
Risk management liabilities	—			423			—			—				423
Current liabilities held for sale	—			114			—			—				114
Total current liabilities	1,508			33,332			3,534			(84		)		38,290
Risk management liabilities - long-term	—			101			—			—				101
Asset retirement obligations	—			34,164			472			—				34,636
Other liabilities	—			191			—			—				191
Long-term debt	—			158,050			—			(27,315		)		130,735
Deferred tax liability	—			4,749			—			—				4,749
Noncurrent liabilities held for sale, net	—			95			—			—				95
Total liabilities	1,508			230,682			4,006			(27,399		)		208,797
Convertible preferred units
Series A convertible preferred units	94,811			—			—			—				94,811
Total partners’ capital	73,839			142,758			57,750			(200,508		)		73,839
Noncontrolling interests	—			—			4,628			—				4,628
Total equity and partners' capital	73,839			142,758			62,378			(200,508		)		78,467
Total liabilities, equity and partners' capital	$	170,158		$	373,440		$	66,384		$	(227,907	)		$	382,075
	Condensed Consolidating Statements of Operations
	Three months ended September 30, 2014
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Revenue	$	—		$	61,275		$	12,532		$	(4,108	)		$	69,699
Gain (Loss) on commodity derivatives, net	—			626			(20		)	—				606
Total revenue	—			61,901			12,512			(4,108		)		70,305
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			40,473			10,325			(4,108		)		46,690
Direct operating expenses	—			10,732			1,152			—				11,884
Selling, general and administrative expenses	—			5,875			—			—				5,875
Equity compensation expense	—			337			—			—				337
Depreciation and accretion expense	—			5,277			429			—				5,706
Total operating expenses	—			62,694			11,906			(4,108		)		70,492
Loss on sale of assets, net	—			(103		)	—			—				(103		)
Operating income	—			(896		)	606			—				(290		)
(Loss) earnings from consolidated affiliate	(3,037		)	573			—			2,464				—
Interest income (expense)	581			(2,011		)	—			—				(1,430		)
Other expense	—			(672		)	—			—				(672		)
Earnings in unconsolidated affiliate	—			117			—			—				117
Net (loss) income before income tax benefit	(2,456		)	(2,889		)	606			2,464				(2,275		)
Income tax benefit	—			(122		)	—			—				(122		)
Net (loss) income from continuing operations	(2,456		)	(3,011		)	606			2,464				(2,397		)
Loss from operations of disposal groups, net of tax	—			(26		)	—			—				(26		)
Net (loss) income	(2,456		)	(3,037		)	606			2,464				(2,423		)
Net income attributable to noncontrolling interests	—			—			33			—				33
Net (loss) income attributable to the Partnership	$	(2,456	)	$	(3,037	)	$	573		$	2,464			$	(2,456	)
	Condensed Consolidating Statements of Operations
	Three months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Revenue	$	—		$	64,346		$	14,562		$	(890	)		$	78,018
Loss on commodity derivatives, net	—			(499		)	—			—				(499		)
Total revenue	—			63,847			14,562			(890		)		77,519
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			45,153			11,502			(890		)		55,765
Direct operating expenses	—			7,886			1,206			—				9,092
Selling, general and administrative expenses	—			4,494			—			—				4,494
Equity compensation expense	—			392			—			—				392
Depreciation and accretion expense	—			7,465			415			—				7,880
Total operating expenses	—			65,390			13,123			(890		)		77,623
Operating (loss) income	—			(1,543		)	1,439			—				(104		)
(Loss) earnings from consolidated affiliate	(2,731		)	1,249			—			1,482				—
Interest expense	—			(2,636		)	—			—				(2,636		)
Net (loss) income before income tax benefit	(2,731		)	(2,930		)	1,439			1,482				(2,740		)
Income tax benefit	—			214			—			—				214
Net (loss) income from continuing operations	(2,731		)	(2,716		)	1,439			1,482				(2,526		)
Loss from operations of disposal groups, net of tax	—			(15		)	—			—				(15		)
Net (loss) income	(2,731		)	(2,731		)	1,439			1,482				(2,541		)
Net income attributable to noncontrolling interests	—			—			190			—				190
Net (loss) income attributable to the Partnership	$	(2,731	)	$	(2,731	)	$	1,249		$	1,482			$	(2,731	)
	Condensed Consolidating Statements of Operations
	Nine months ended September 30, 2014
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments					Consolidated
Revenue	$	—		$	200,619		$	36,591		$	(9,270	)			$	227,940
Loss on commodity derivatives, net	—			392			(109		)	—					283
Total revenue	—			201,011			36,482			(9,270		)			228,223
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			135,487			29,512			(9,270		)			155,729
Direct operating expenses	—			28,395			3,494			—					31,889
Selling, general and administrative expenses	—			17,105			—			—					17,105
Equity compensation expense	—			1,132			—			—					1,132
Depreciation and accretion expense	—			18,076			1,274			—					19,350
Total operating expenses	—			200,195			34,280			(9,270		)			225,205
Gain on sale of assets, net	—			(124		)	—			—					(124		)
Operating (loss) income	—			692			2,202			—					2,894
(Loss) earnings from consolidated affiliate	(5,549		)	1,995			—			3,554					—
Interest income (expense)	1,826			(6,839		)	—			—					(5,013		)
Other expense	—			(672		)	—			—			—		(672		)
Earnings in unconsolidated affiliate	—			117			—			—					117
Net (loss) income before income tax benefit	(3,723		)	(4,707		)	2,202			3,554					(2,674		)
Income tax expense	—			(260		)	—			—					(260		)
Net (loss) income from continuing operations	(3,723		)	(4,967		)	2,202			3,554					(2,934		)
Income from operations of disposal groups, net of tax	—			(582		)	—			—					(582		)
Net (loss) income	(3,723		)	(5,549		)	2,202			3,554					(3,516		)
Net income attributable to noncontrolling interests	—			—			207			—					207
Net (loss) income attributable to the Partnership	$	(3,723	)	$	(5,549	)	$	1,995		$	3,554				$	(3,723	)
	Condensed Consolidating Statements of Operations
	Nine months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Revenue	$	—		$	179,744		$	41,818		$	(4,361	)		$	217,201
Gain on commodity derivatives, net	—			110			—			—				110
Total revenue	—			179,854			41,818			(4,361		)		217,311
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			134,368			32,991			(4,361		)		162,998
Direct operating expenses	—			18,961			3,408			—				22,369
Selling, general and administrative expenses	—			12,507			—			—				12,507
Equity compensation expense	—			1,877			—			—				1,877
Depreciation and accretion expense	—			21,031			1,243			—				22,274
Total operating expenses	—			188,744			37,642			(4,361		)		222,025
Gain on involuntary conversion of property, plant and equipment	—			343			—			—				343
Loss on impairment of property, plant and equipment	—			(15,232		)	—			—				(15,232		)
Operating (loss) income	—			(23,779		)	4,176			—				(19,603		)
(Loss) earnings from consolidated affiliate	(28,396		)	3,643			—			24,753				—
Interest expense	—			(6,958		)	—			—				(6,958		)
Net (loss) income before income tax benefit	(28,396		)	(27,094		)	4,176			24,753				(26,561		)
Income tax benefit	—			589			—			—				589
Net (loss) income from continuing operations	(28,396		)	(26,505		)	4,176			24,753				(25,972		)
Loss from operations of disposal groups, net of tax	—			(1,891		)	—			—				(1,891		)
Net (loss) income	(28,396		)	(28,396		)	4,176			24,753				(27,863		)
Net income attributable to noncontrolling interests	—			—			533			—				533
Net (loss) income attributable to the Partnership	$	(28,396	)	$	(28,396	)	$	3,643		$	24,753			$	(28,396	)
	Condensed Consolidating Statements of Comprehensive Income
	Three months ended September 30, 2014
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net (loss) income	$	(2,456	)	$	(3,037	)	$	606		$	2,464			$	(2,423	)
Unrealized gain on post retirement benefit plan assets and liabilities	7			7			—			(7		)		7
Comprehensive (loss) income	(2,449		)	(3,030		)	606			2,457				(2,416		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			33			—				33
Comprehensive (loss) income attributable to the Partnership	$	(2,449	)	$	(3,030	)	$	573		$	2,457			$	(2,449	)
	Condensed Consolidating Statements of Comprehensive Income
	Three months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net (loss) income	$	(2,731	)	$	(2,731	)	$	1,439		$	1,482			$	(2,541	)
Unrealized loss on post retirement benefit plan assets and liabilities	(34		)	(34		)	—			34				(34		)
Comprehensive (loss) income	(2,765		)	(2,765		)	1,439			1,516				(2,575		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			190			—				190
Comprehensive (loss) income attributable to the Partnership	$	(2,765	)	$	(2,765	)	$	1,249		$	1,516			$	(2,765	)
	Condensed Consolidating Statements of Comprehensive Income
	Nine months ended September 30, 2014
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net (loss) income	$	(3,723	)	$	(5,549	)	$	2,202		$	3,554			$	(3,516	)
Unrealized loss on post retirement benefit plan assets and liabilities	53			53			—			(53		)		53
Comprehensive (loss) income	(3,670		)	(5,496		)	2,202			3,501				(3,463		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			207			—				207
Comprehensive (loss) income attributable to the Partnership	$	(3,670	)	$	(5,496	)	$	1,995		$	3,501			$	(3,670	)
	Condensed Consolidating Statements of Comprehensive Income
	Nine months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net (loss) income	$	(28,396	)	$	(28,396	)	$	4,176		$	24,753			$	(27,863	)
Unrealized loss on post retirement benefit plan assets and liabilities	(90		)	(90		)	—			90				(90		)
Comprehensive (loss) income	(28,486		)	(28,486		)	4,176			24,843				(27,953		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			533			—				533
Comprehensive (loss) income attributable to the Partnership	$	(28,486	)	$	(28,486	)	$	3,643		$	24,843			$	(28,486	)
	Condensed Consolidating Statements of Cash Flows
	Nine months ended September 30, 2014
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net cash provided by operating activities	$	—		$	14,555		$	3,685		$	—			$	18,240
Cash flows from investing activities
Cost of acquisitions, net of cash acquired	—			(110,909		)	—			—				(110,909		)
Additions to property, plant and equipment	—			(40,653		)	(604		)	—				(41,257		)
Proceeds from disposals of property, plant and equipment	—			6,323			—			—				6,323
Equity method investment	—			(12,000		)	—			—				(12,000		)
Proceeds from equity method investment, return of capital	—			983			—			—				983
Net contributions from affiliates	19,549			—			—			(19,549		)		—
Net distributions to affiliates	(237,231		)	—			—			237,231				—
Net cash (used in) by investing activities	(217,682		)	(156,256		)	(604		)	217,682				(156,860		)
Cash flows from financing activities
Net contributions from affiliates	—			237,231			—			(237,231		)		—
Net distributions to affiliates	—			(16,741		)	(2,808		)	19,549				—
Proceeds from issuance of common units, net of offering costs	204,335			—			—			—				204,335
Unit holder contributions	2,896			—			—			—				2,896
Unit holder distributions	(19,549		)	—			—			—				(19,549		)
Issuance of Series B Units	30,000			—			—			—				30,000
Acquisition of noncontrolling interest	—			(8		)	—			—				(8		)
Net distributions to noncontrolling interest owners	—			—			(273		)	—				(273		)
LTIP tax netting unit repurchase	—			(253		)	—			—				(253		)
Deferred debt issuance costs	—			(3,380		)	—			—				(3,380		)
Payments on other debt	—			(2,217		)	—			—				(2,217		)
Borrowings on other debt	—			170			—			—				170
Payments on long-term debt	—			(212,670		)	—			—				(212,670		)
Borrowings on long-term debt	—			139,635			—			—				139,635
Net cash provided by (used in) financing activities	217,682			141,767			(3,081		)	(217,682		)		138,686
Net increase in cash and cash equivalents	—			66			—			—				66
Cash and cash equivalents
Beginning of period	1			392			—			—				393
End of period	$	1		$	458		$	—		$	—			$	459
Supplemental cash flow information
Interest payments, net	$	—		$	4,064		$	—		$	—			$	4,064
Supplemental non-cash information
Increase in accrued property, plant and equipment	$	—		$	17,746		$	—		$	—			$	17,746
Accrued unitholder distribution for Series A Units	$	9,925		$	—		$	—		$	—			$	9,925
In-kind unitholder distribution for Series B Units	$	1,671		$	—		$	—		$	—			$	1,671
	Condensed Consolidating Statements of Cash Flows
	Nine months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net cash provided by operating activities	$	—		$	11,413		$	4,174		$	—			$	15,587
Cash flows from investing activities
Additions to property, plant and equipment	—			(22,841		)	(1		)	—				(22,842		)
Insurance proceeds from involuntary conversion of property, plant and equipment	—			482			—			—				482
Net contributions from affiliates	12,458			—			—			(12,458		)		—
Net distributions to affiliates	(27,468		)	—			—			27,468				—
Net cash (used in) investing activities	(15,010		)	(22,359		)	(1		)	15,010				(22,360		)
Cash flows from financing activities
Net contributions from affiliates	—			27,468			—			(27,468		)		—
Net distributions to affiliates	—			(8,856		)	(3,602		)	12,458				—
Unit holder contributions	13,075			—			—			—				13,075
Unit holder distributions	(12,458		)	—			—			—				(12,458		)
Issuance of Series A Convertible Preferred Units	14,393			—			—			—				14,393
Net distributions to noncontrolling interest owners	—			—			(571		)	—				(571		)
LTIP tax netting unit repurchase	—			(400		)	—			—				(400		)
Deferred debt issuance costs	—			(1,509		)	—			—				(1,509		)
Payments on other debt	—			(2,231		)	—			—				(2,231		)
Borrowings on other debt	—			1,495			—			—				1,495
Payments on bank loans	—			(1,072		)	—			—				(1,072		)
Borrowings on bank loans	—			6,200			—			—				6,200
Payments on long-term debt	—			(99,821		)	—			—				(99,821		)
Borrowings on long-term debt	—			92,571			—			—				92,571
Net cash provided by (used in) financing activities	15,010			13,845			(4,173		)	(15,010		)		9,672
Net decrease in cash and cash equivalents	—			2,899			—			—				2,899
Cash and cash equivalents
Beginning of period	1			575			—			—				576
End of period	$	1		$	3,474		$	—		$	—			$	3,475
Supplemental cash flow information
Interest payments, net	$	—		$	5,051		$	—		$	—			$	5,051
Supplemental non-cash information
Decrease in accrued property, plant and equipment	$	—		$	(6,080	)	$	—		$	—			$	(6,080	)
Net assets contributed	22,129			—			—			—				22,129
Net assets contributed in exchange for the issuance of Series A convertible preferred units	59,994			—			—			—				59,994
Fair value of Series A Units in excess of net assets received	15,612			—			—			—				15,612
Accrued unitholder distribution for Series A Units	2,912			—			—			—				2,912

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	Distribution
	On October 23, 2014, we announced a distribution of $0.4725 per unit for the quarter ended September 30, 2014, or $1.89 per unit on an annualized basis, payable on November 14, 2014 to unitholders of record on November 7, 2014. Holders of our Series B Units will participate in this distribution and will receive this distribution in Series B Units rather than cash.
	Acquisition
	On October 13, 2014, the Partnership acquired Costar Midstream , LLC ("Costar") from Energy Spectrum Partners VI LP and Costar Midstream Energy, LLC for a purchase price of $471.5 million. Costar is an onshore gathering and processing company with its primary gathering, processing, fractionation, and off-spec condensate treating and stabilization assets in East Texas and the Permian basin, with a significant crude oil gathering system project underway in the Bakken oil play.
	The acquisition was funded with 6,892,931 common units of the Partnership issued directly to Energy Spectrum Partners VI LP and Costar Midstream Energy, LLC, which units are subject to customary lock-up provisions, and $271.6 million of cash from borrowings under the Partnership’s Credit Agreement and proceeds from the Pipe Offering.

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Nature of Business	'
	Nature of Business
	American Midstream Partners, LP (the “Partnership”), was formed on August 20, 2009 as a Delaware limited partnership for the purpose of operating, developing and acquiring a diversified portfolio of midstream energy assets. We provide natural gas gathering, treating, processing, fractionating, marketing and transportation services primarily in the Gulf Coast and Southeast regions of the United States through our ownership and operation of nine gathering systems, two processing facilities, one fractionation facility, three interstate pipelines and five intrastate pipelines. In addition, we own a 50% undivided, non-operating interest in a processing plant located in southern Louisiana. Through our four marine terminal sites, we provide petroleum, agricultural, and chemical liquid storage services.
	We hold our assets in a series of wholly owned limited liability companies, a limited partnership and a corporation. Our capital accounts consist of general partner interests and limited partner interests.
	Our interstate natural gas pipeline assets transport natural gas through the FERC regulated interstate natural gas pipelines in Louisiana, Mississippi, Alabama and Tennessee. Our interstate pipelines include:
	•	High Point Gas Transmission, LLC, which owns and operates approximately 400 miles of intrastate pipeline and is connected to 40 meters with 32 active producers and offers processing options at the Toca processing plant with delivery to Southern Natural Gas available downstream of the processing plant in Louisiana;
	•	American Midstream (Midla), LLC, which owns and operates approximately 370 miles of interstate pipeline that runs from the Monroe gas field in northern Louisiana south through Mississippi to Baton Rouge, Louisiana;
	•	American Midstream (AlaTenn), LLC, which owns and operates approximately 295 miles of interstate pipeline that runs through the Tennessee River Valley from Selmer, Tennessee to Huntsville, Alabama and serves an eight-county area in Alabama, Mississippi and Tennessee.
	Common Unit Purchase Agreement
	On July 14, 2014, the Partnership entered into a common unit purchase agreement with certain institutional investors, which was subsequently amended on August 15, 2014 to provide for the sale of 4,622,352 common units representing limited partner interests in the Partnership (the "PIPE Offering") in a private placement at a price of $25.8075 per common unit (reflecting an adjustment for the Partnership's second quarter distribution of $0.4625 per unit), for cash consideration of $119.3 million. The PIPE Offering was completed on August 20, 2014.
	Series A Distribution Amendment
	The Partnership executed an amendment (the "Amendment") to the Partnership agreement related to its outstanding Series A convertible preferred units ("Series A Units") which became effective July 24, 2014. As a result of the Amendment, distributions on Series A Units will be made with paid-in-kind Series A Units, cash or a combination thereof, at the discretion of the Board of Directors, which began with the distribution for the three months ended June 30, 2014 and will continue through the distribution for the quarter ended March 31, 2015. Prior to the Amendment, the Partnership was required to pay distributions on the Series A Units with a combination of paid-in-kind units and cash. We have recorded the impacts of the Amendment for the three months ended September 30, 2014 and have accrued $4.2 million for the paid-in-kind Series A Units.
	Equity Offering and Series B Convertible Units Issuance
	In January 2014, in connection with the Lavaca Acquisition as discussed in Note 3, the Partnership completed a public equity offering resulting in net proceeds of $86.9 million and the issuance to our General Partner of 1,168,225 Series B convertible units ("Series B Units") representing Series B limited partnership interests in the Partnership. The net proceeds related to the Series B Units issuance was $30.0 million. The Series B Units have the right to share in distributions from the Partnership on a pro-rata basis with holders of the Partnership’s common units and will convert into common units on a one-for-one basis on January 31, 2016. During 2014, the Partnership has elected to pay the Series B distributions using paid-in-kind Series B Units.
Basis of Presentation	'
	Basis of Presentation
	These unaudited condensed consolidated financial statements have been prepared in accordance with GAAP for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end balance sheet data was derived from consolidated audited financial statements but does not include disclosures required by GAAP for annual periods. We have made reclassifications to amounts reported in prior period condensed consolidated financial statements to conform to our current year presentation. These reclassifications did not have an impact on net income for the period previously reported. The information furnished herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair statement of financial position and results of operations for the respective interim periods.
	The financial results for the three and nine months ended September 30, 2013 have been reclassified to present an asset group previously presented as held for sale as held and used.
	Our financial results for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the full year ended December 31, 2014. These unaudited condensed consolidated financial statements should be read in conjunction with our consolidated financial statements and notes thereto included in i) our Annual Report on Form 10-K for the year ended December 31, 2013 (“Annual Report”) filed on March 11, 2014 and ii) our Annual Report on Form 10-K/A that was filed with the Securities and Exchange Commission ("SEC") on May 12, 2014, which updated portions of our annual report.
Consolidation Policy	'
	Consolidation Policy
	Our condensed consolidated financial statements include our accounts and those of our subsidiaries in which we have a controlling interest. We hold a 50% undivided interest in the Burns Point gas processing facility in which we are responsible for our proportionate share of the costs and expenses of the facility. Our condensed consolidated financial statements reflect our proportionate share of the revenues, expenses, assets and liabilities of this undivided interest. As of September 30, 2014, we also hold a 92.2% undivided interest in the Chatom Processing and Fractionation facility (the "Chatom System"). Our condensed consolidated financial statements reflect the accounts of the Chatom System and the interests in the Chatom System held by non-affiliated working interest owners are reflected as noncontrolling interests in the Partnership's condensed consolidated financial statements.
Use of Estimates	'
	Use of Estimates
	When preparing condensed consolidated financial statements in conformity with GAAP, management must make estimates and assumptions based on information available at the time. These estimates and assumptions affect the reported amounts of assets, liabilities, revenues and expenses, as well as the disclosures of contingent assets and liabilities as of the date of the financial statements. Estimates and judgments are based on information available at the time such estimates and judgments are made. Adjustments made with respect to the use of these estimates and judgments often relate to information not previously available. Uncertainties with respect to such estimates and judgments are inherent in the preparation of financial statements. Estimates and judgments are used in, among other things i) estimating unbilled revenues, accrued gas purchases and operating and general and administrative costs, ii) developing fair value assumptions, including estimates of future cash flows and discount rates, iii) analyzing long-lived assets, goodwill and intangible assets for possible impairment, iv) estimating the useful lives of assets and v) determining amounts to accrue for contingencies, guarantees and indemnifications. Actual results, therefore, could differ materially from estimated amounts.

Acquisitions_and_Divestitures_

Acquisitions and Divestitures Lavaca Acquisition (Tables)	9 Months Ended
	Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]	'
Business Combination Disclosure [Text Block]	'
	The following table summarizes the preliminary purchase price allocation for the Lavaca Acquisition (in thousands):
	Property, plant and equipment:
	Land	$	2
	Pipelines	58,737
	Equipment	753
	Total property, plant and equipment	59,492
	Intangible assets	44,917
	Total cash consideration	$	104,409

Discontinued_Operations_Operat

Discontinued Operations Operation of discontinued operations (Tables)	9 Months Ended
	Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	'
	The following table presents the revenue and expenses and Loss from operations of disposal groups, net of tax associated with the assets classified as held for sale for the three and nine months ended September 30, 2014 and 2013 (in thousands, except per unit amounts):
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
	Revenue	$	13		$	591		$	461		$	1,717
	Expense	(55		)	(606		)	(599		)	(1,801		)
	Loss on impairment of property, plant and equipment	—			—			(673		)	(1,807		)
	Loss on sale of assets	—			—			(87		)	—
	Income tax benefit	16			—			316			—
	Loss from operations of disposal groups, net of tax	$	(26	)	$	(15	)	$	(582	)	$	(1,891	)
	Limited partners' net loss per unit from discontinued operations (basic and diluted)	$	—		$	0.01		$	(0.05	)	$	(0.21	)

Concentration_of_Credit_Risk_a1

Concentration of Credit Risk and Trade Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2014
Risks and Uncertainties [Abstract]	'
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	'
	The following table summarizes the percentage of revenue earned from those customers that accounted for 10% or more of the Partnership's consolidated revenue in the condensed consolidated statement of operations for the each of the periods presented below:
		Three months ended September 30,				Nine months ended September 30,
		2014		2013		2014		2013
	Customer A	24	%	27	%	26	%	29	%
	Customer B	14	%	13	%	14	%	12	%
	Customer C	10	%	13	%	10	%	13	%
	Customer D	—	%	—	%	10	%	—	%
	Other	52	%	47	%	40	%	46	%
	Total	100	%	100	%	100	%	100	%

Derivatives_Tables

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair value associated with commodity derivative instruments	'
	As of September 30, 2014 and December 31, 2013, the value associated with our commodity derivatives, interest rate swap, and weather derivative were recorded in our condensed consolidated balance sheets, under the captions as follows (in thousands):
			Gross Risk Management Assets						Gross Risk Management Liabilities							Net Risk Management Assets (Liabilities)
	Balance Sheet Classification		September 30,			December 31, 2013			September 30,				December 31, 2013			September 30,			December 31, 2013
			2014						2014							2014
	Current		$	1,047		$	473		$	—			$	—		$	1,047		$	473
	Noncurrent		—			—			—				—			—			—
	Total assets		$	1,047		$	473		$	—			$	—		$	1,047		$	473
	Current		$	—		$	27		$	(335	)		$	(450	)	$	(335	)	$	(423	)
	Noncurrent		—			—			—				(101		)	—			(101		)
	Total liabilities		$	—		$	27		$	(335	)		$	(551	)	$	(335	)	$	(524	)
Realized and unrealized gains (losses) with commodity and interst rate derivative instruments	'
	For the three and nine months ended September 30, 2014 and 2013, respectively, the realized and unrealized gains (losses) associated with our commodity derivatives, interest rate swap instrument and weather derivative were recorded in our condensed consolidated statements of operations, under the captions as follows (in thousands):
		Three months ended September 30,						Nine months ended September 30,
		Gain (loss) on derivatives						Gain (loss) on derivatives
	Statement of Operations Classification	Realized			Unrealized			Realized				Unrealized
	2014
	Commodity derivatives	$	(9	)	$	615		$	(191	)		$	474
	Interest expense	(109		)	91			(322		)		118
	Direct operating expenses	(241		)	—			(794		)		—
	Total	$	(359	)	$	706		$	(1,307	)		$	592
	2013
	Commodity derivatives	$	261		$	(760	)	$	797			$	(687	)
	Interest expense	(101		)	(153		)	(101		)		(471		)
	Direct operating expenses	(284		)	—			(378		)		—
	Total	$	(124	)	$	(913	)	$	318			$	(1,158	)

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair value of financial instruments	'
	Fair Value of Financial Instruments
	The following table sets forth by level within the fair value hierarchy, our commodity derivative instruments and interest rate swap, included as part of Risk management assets and Risk management liabilities within the condensed consolidated balance sheet, that were measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013 (in thousands):
		Carrying			Estimated Fair Value
		Amount			Level 1		Level 2			Level 3		Total
	Commodity derivative instruments, net
	September 30, 2014	$	404		$	—	$	404		$	—	$	404
	December 31, 2013	(70		)	—		(70		)	—		(70		)
	Interest rate swap
	30-Sep-14	$	(335	)	$	—	$	(335	)	$	—	$	(335	)
	31-Dec-13	(454		)	—		(454		)	—		(454		)

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property, plant and equipment, net	'
	Property, plant and equipment, net, as of September 30, 2014 and December 31, 2013 were as follows (in thousands):
		Useful Life	September 30,			December 31,
		(in years)	2014			2013
	Land	N/A	$	6,133		$	6,015
	Construction in progress	N/A	44,707			6,443
	Base gas	N/A	1,108			1,108
	Buildings and improvements	4 to 40	5,522			5,109
	Processing and treating plants	8 to 40	98,291			97,106
	Pipelines	5 to 40	304,771			239,865
	Compressors	4 to 20	18,185			11,955
	Dock	20 to 40	8,004			7,942
	Tanks, truck rack and piping	20 to 40	24,390			22,432
	Equipment	8 to 20	8,645			6,294
	Computer software	5	3,696			3,531
	Total property, plant and equipment		523,452			407,800
	Accumulated depreciation		(107,653		)	(95,099		)
	Property, plant and equipment, net		$	415,799		$	312,701

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]	'
Schedule of Asset Retirement Obligations [Table Text Block]	'
		September 30, 2014
	Beginning asset retirement obligation	$	34,636
	Liabilities assumed	248
	Expenditures	(690		)
	Accretion expense	588
	Ending asset retirement obligation	$	34,782

Debt_Obligations_Tables

Debt Obligations (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Outstanding borrowings under the credit facility	'
	Our outstanding borrowings at September 30, 2014 and December 31, 2013, respectively, were (in thousands):
		September 30,		December 31,
		2014		2013
	Revolving credit facility	$	57,700	$	130,735
	Other debt	1		2,048
	Total debt	57,701		132,783
	Less: current portion	1		2,048
	Long-term debt	$	57,700	$	130,735

Partners_Capital_Tables

Partners' Capital (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Numbers of units outstanding	'
	The numbers of units outstanding as of September 30, 2014 and December 31, 2013, respectively, were as follows (in thousands):
		September 30,			December 31,
		2014			2013
	Series A convertible preferred units	5,586			5,279
	Series B convertible units	1,232			—
	Limited partner common units	15,771			7,414
	General partners units	299			185
Schedule of Calulation for Net Income (Loss) Per Limited Partner Unit	'
		Three months ended September 30,							Nine months ended September 30,
		2014				2013			2014			2013
	Net loss from continuing operations	$	(2,397	)		$	(2,526	)	$	(2,934	)	$	(25,972	)
	Less: Net income attributable to noncontrolling interests	33				190			207			533
	Net loss from continuing operations attributable to the Partnership	(2,430		)		(2,716		)	(3,141		)	(26,505		)
	Less:
	Contractual distributions on Series A Units	4,165				2,873			11,263			20,899
	Declared distributions on Series B Units	619				—			1,671			—
	General partner's distribution	603				80			1,688			240
	General partner's share in undistributed loss	(169		)		(290		)	(430		)	(1,610		)
	Net loss from continuing operations available to limited partners	(7,648		)		(5,379		)	(17,333		)	(46,034		)
	Net loss from operations of disposal groups, net of tax, available to limited partners	(26		)		38			(574		)	(1,742		)
	Net loss available to limited partners	$	(7,674	)		$	(5,341	)	$	(17,907	)	$	(47,776	)
	Weighted average number of units used in computation of limited partners’ net (loss) income per unit (basic and diluted)	13,204				6,663			11,409			8,334
	Limited partners' net loss per common unit
	Basic and diluted:
	Loss from continuing operations	$	(0.58	)		$	(0.81	)	$	(1.52	)	$	(5.52	)
	Loss from discontinued operations	—				0.01			(0.05		)	(0.21		)
	Net loss	$	(0.58	)		$	(0.80	)	$	(1.57	)	$	(5.73	)

LongTerm_Incentive_Plan_Tables

Long-Term Incentive Plan (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Table summarizes our unit-based awards	'
	The following table summarizes the change in our unit-based awards during the nine months ended September 30, 2014 indicated, in units:
		Nine months ended September 30, 2014
		Shares		Weighted-Average Exercise Price
	Outstanding at beginning of period	75,529		17.62
	Granted	183,163		20.68
	Forfeited	(12,009	)	18.28
	Vested	(43,986	)	20.72
	Outstanding at end of period	202,697		19.67

Reporting_Segments_Tables

Reporting Segments (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment information	'
	The following tables set forth our segment information for the three and nine months ended September 30, 2014 and 2013 (in thousands):
		Three months ended September 30, 2014
		Gathering			Transmission		Terminals		Total
		and
		Processing
	Revenue	$	45,569		$	20,328	$	3,802	$	69,699
	Loss on commodity derivatives, net	606			—		—		606
	Total revenue	46,175			20,328		3,802		70,305
	Operating expenses:
	Purchases of natural gas, NGL's and condensate	35,024			11,666		—		46,690
	Direct operating expenses	5,249			5,033		1,602		11,884
	Selling, general and administrative expenses								5,875
	Equity compensation expense								337
	Depreciation, amortization and accretion expense								5,706
	Total operating expenses								70,492
	Loss on sale of assets, net								(103		)
	Other expense								(672		)
	Interest expense								(1,430		)
	Earnings in unconsolidated affiliate								117
	Income tax expense								(122		)
	Loss from operations of disposal groups, net of tax								(26		)
	Net loss								(2,423		)
	Less: Net income attributable to non-controlling interests								33
	Net loss attributable to the Partnership								$	(2,456	)
	Segment gross margin (a)	$	10,513		$	8,619	$	2,200	$	21,332
		Three months ended September 30, 2013
		Gathering			Transmission		Terminals		Total
		and
		Processing
	Revenue	$	52,082		$	22,478	$	3,458	$	78,018
	Gain on commodity derivatives, net	(499		)	—		—		(499		)
	Total revenue	51,583			22,478		3,458		77,519
	Operating expenses:
	Purchases of natural gas, NGL's and condensate	41,180			14,585		—		55,765
	Direct operating expenses	3,805			3,994		1,293		9,092
	Selling, general and administrative expenses								4,494
	Equity compensation expense								392
	Depreciation, amortization and accretion expense								7,880
	Total operating expenses								77,623
	Interest expense								(2,636		)
	Income tax benefit								214
	Loss from operations of disposal groups, net of tax								(15		)
	Net loss								(2,541		)
	Less: Net income attributable to non-controlling interests								190
	Net loss attributable to the Partnership								$	(2,731	)
	Segment gross margin (a)	$	10,879		$	7,864	$	2,165	$	20,908
		Nine months ended September 30, 2014
		Gathering			Transmission		Terminals		Total
		and
		Processing
	Revenue	$	147,209		$	69,417	$	11,314	$	227,940
	Loss on commodity derivatives, net	283			—		—		283
	Total revenue	147,492			69,417		11,314		228,223
	Operating expenses:
	Purchases of natural gas, NGL's and condensate	115,383			40,346		—		155,729
	Direct operating expenses	15,163			11,887		4,839		31,889
	Selling, general and administrative expenses								17,105
	Equity compensation expense								1,132
	Depreciation, amortization and accretion expense								19,350
	Total operating expenses								225,205
	Loss on sale of assets, net								(124		)
	Other expense								(672		)
	Interest expense								(5,013		)
Earnings in unconsolidated affiliate								117
Income tax expense								(260		)
Loss from operations of disposal groups, net of tax								(582		)
Net loss								(3,516		)
Less: Net income attributable to non-controlling interests								207
Net loss attributable to the Partnership								$	(3,723	)
Segment gross margin (a)	$	31,122		$	28,983	$	6,475	$	66,580
	Nine months ended September 30, 2013
	Gathering			Transmission		Terminals		Total
	and
	Processing
Revenue	$	154,336		$	56,539	$	6,326	$	217,201
Loss on commodity derivatives, net	110			—		—		110
Total revenue	154,446			56,539		6,326		217,311
Operating expenses:
Purchases of natural gas, NGL's and condensate	125,888			37,110		—		162,998
Direct operating expenses	10,924			8,943		2,502		22,369
Selling, general and administrative expenses								12,507
Equity compensation expense								1,877
Depreciation, amortization and accretion expense								22,274
Total operating expenses								222,025
Gain on involuntary conversion of property, plant and equipment								343
Loss on impairment of property, plant and equipment								(15,232		)
Interest expense								(6,958		)
Income tax benefit								589
Loss from operations of disposal groups, net of tax								(1,891		)
Net loss								(27,863		)
Less: Net income attributable to non-controlling interests								533
Net loss attributable to the Partnership								$	(28,396	)
Segment gross margin (a)	$	28,812		$	19,296	$	3,824	$	51,932
(a)	Segment gross margin for our Gathering and Processing segment consists of revenue less purchases of natural gas, NGLs and condensate and revenue from construction, operating and maintenance agreements (“COMA”). Segment gross margin for our Transmission segment consists of revenue, less purchases of natural gas and COMA. Segment gross margin for our Terminals segment consists of revenue, less direct operating expenses. Gross margin consists of the sum of the segment gross margin amounts for each of these segments. As an indicator of our operating performance, gross margin should not be considered an alternative to, or more meaningful than, net income or cash flow from operations as determined in accordance with GAAP. Our gross margin may not be comparable to a similarly titled measure of another company because other entities may not calculate gross margin in the same manner.

Subsidiary_Guarantors_Tables

Subsidiary Guarantors (Tables)	9 Months Ended
	Sep. 30, 2014
Subsidiary Guarantors [Abstract]	'
Schedule of Condensed Balance Sheet [Table Text Block]	'
		Condensed Consolidating Balance Sheet
		31-Dec-13
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
	Assets
	Current assets
	Cash and cash equivalents	$	1		$	392		$	—		$	—			$	393
	Accounts receivable	—			4,461			2,361			—				6,822
	Unbilled revenue	—			18,321			4,680			—				23,001
	Risk management assets	—			473			—			—				473
	Other current assets	84			6,942			555			(84		)		7,497
	Current assets held for sale	—			272			—			—				272
	Total current assets	85			30,861			7,596			(84		)		38,458
	Risk management assets, long-term	—			—			—			—				—
	Property, plant and equipment, net	—			254,656			58,045			—				312,701
	Note receivable	27,315			—			—			(27,315		)		—
	Goodwill	—			16,447			—			—				16,447
	Intangible assets, net	—			3,682			—			—				3,682
	Other assets, net	—			8,321			743			—				9,064
	Noncurrent assets held for sale, net	—			1,723			—			—				1,723
	Investment in subsidiaries	142,758			57,750			—			(200,508		)		—
	Total assets	$	170,158		$	373,440		$	66,384		$	(227,907	)		$	382,075
	Liabilities, Equity and Partners’ Capital
	Current liabilities
	Accounts payable	$	30		$	2,902		$	329		$	—			$	3,261
	Accrued gas purchases	—			14,282			3,104			—				17,386
	Accrued expenses and other current liabilities	1,478			13,563			101			(84		)		15,058
	Current portion of long-term debt	—			2,048			—			—				2,048
	Risk management liabilities	—			423			—			—				423
	Current liabilities held for sale	—			114			—			—				114
	Total current liabilities	1,508			33,332			3,534			(84		)		38,290
	Risk management liabilities - long-term	—			101			—			—				101
	Asset retirement obligations	—			34,164			472			—				34,636
	Other liabilities	—			191			—			—				191
	Long-term debt	—			158,050			—			(27,315		)		130,735
	Deferred tax liability	—			4,749			—			—				4,749
	Noncurrent liabilities held for sale, net	—			95			—			—				95
	Total liabilities	1,508			230,682			4,006			(27,399		)		208,797
	Convertible preferred units
	Series A convertible preferred units	94,811			—			—			—				94,811
	Total partners’ capital	73,839			142,758			57,750			(200,508		)		73,839
	Noncontrolling interests	—			—			4,628			—				4,628
	Total equity and partners' capital	73,839			142,758			62,378			(200,508		)		78,467
	Total liabilities, equity and partners' capital	$	170,158		$	373,440		$	66,384		$	(227,907	)		$	382,075
Schedule of Condensed Income Statement [Table Text Block]	'
		Condensed Consolidating Statements of Operations
		Three months ended September 30, 2014
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
	Revenue	$	—		$	61,275		$	12,532		$	(4,108	)		$	69,699
	Gain (Loss) on commodity derivatives, net	—			626			(20		)	—				606
	Total revenue	—			61,901			12,512			(4,108		)		70,305
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	—			40,473			10,325			(4,108		)		46,690
	Direct operating expenses	—			10,732			1,152			—				11,884
	Selling, general and administrative expenses	—			5,875			—			—				5,875
	Equity compensation expense	—			337			—			—				337
	Depreciation and accretion expense	—			5,277			429			—				5,706
	Total operating expenses	—			62,694			11,906			(4,108		)		70,492
	Loss on sale of assets, net	—			(103		)	—			—				(103		)
	Operating income	—			(896		)	606			—				(290		)
	(Loss) earnings from consolidated affiliate	(3,037		)	573			—			2,464				—
	Interest income (expense)	581			(2,011		)	—			—				(1,430		)
	Other expense	—			(672		)	—			—				(672		)
	Earnings in unconsolidated affiliate	—			117			—			—				117
	Net (loss) income before income tax benefit	(2,456		)	(2,889		)	606			2,464				(2,275		)
	Income tax benefit	—			(122		)	—			—				(122		)
	Net (loss) income from continuing operations	(2,456		)	(3,011		)	606			2,464				(2,397		)
	Loss from operations of disposal groups, net of tax	—			(26		)	—			—				(26		)
	Net (loss) income	(2,456		)	(3,037		)	606			2,464				(2,423		)
	Net income attributable to noncontrolling interests	—			—			33			—				33
	Net (loss) income attributable to the Partnership	$	(2,456	)	$	(3,037	)	$	573		$	2,464			$	(2,456	)
		Condensed Consolidating Statements of Operations
		Three months ended September 30, 2013
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
	Revenue	$	—		$	64,346		$	14,562		$	(890	)		$	78,018
	Loss on commodity derivatives, net	—			(499		)	—			—				(499		)
	Total revenue	—			63,847			14,562			(890		)		77,519
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	—			45,153			11,502			(890		)		55,765
	Direct operating expenses	—			7,886			1,206			—				9,092
	Selling, general and administrative expenses	—			4,494			—			—				4,494
	Equity compensation expense	—			392			—			—				392
	Depreciation and accretion expense	—			7,465			415			—				7,880
	Total operating expenses	—			65,390			13,123			(890		)		77,623
	Operating (loss) income	—			(1,543		)	1,439			—				(104		)
	(Loss) earnings from consolidated affiliate	(2,731		)	1,249			—			1,482				—
	Interest expense	—			(2,636		)	—			—				(2,636		)
	Net (loss) income before income tax benefit	(2,731		)	(2,930		)	1,439			1,482				(2,740		)
	Income tax benefit	—			214			—			—				214
	Net (loss) income from continuing operations	(2,731		)	(2,716		)	1,439			1,482				(2,526		)
	Loss from operations of disposal groups, net of tax	—			(15		)	—			—				(15		)
	Net (loss) income	(2,731		)	(2,731		)	1,439			1,482				(2,541		)
	Net income attributable to noncontrolling interests	—			—			190			—				190
	Net (loss) income attributable to the Partnership	$	(2,731	)	$	(2,731	)	$	1,249		$	1,482			$	(2,731	)
		Condensed Consolidating Statements of Operations
		Nine months ended September 30, 2014
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments					Consolidated
	Revenue	$	—		$	200,619		$	36,591		$	(9,270	)			$	227,940
	Loss on commodity derivatives, net	—			392			(109		)	—					283
	Total revenue	—			201,011			36,482			(9,270		)			228,223
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	—			135,487			29,512			(9,270		)			155,729
	Direct operating expenses	—			28,395			3,494			—					31,889
	Selling, general and administrative expenses	—			17,105			—			—					17,105
	Equity compensation expense	—			1,132			—			—					1,132
	Depreciation and accretion expense	—			18,076			1,274			—					19,350
	Total operating expenses	—			200,195			34,280			(9,270		)			225,205
	Gain on sale of assets, net	—			(124		)	—			—					(124		)
Operating (loss) income	—			692			2,202			—					2,894
(Loss) earnings from consolidated affiliate	(5,549		)	1,995			—			3,554					—
Interest income (expense)	1,826			(6,839		)	—			—					(5,013		)
Other expense	—			(672		)	—			—			—		(672		)
Earnings in unconsolidated affiliate	—			117			—			—					117
Net (loss) income before income tax benefit	(3,723		)	(4,707		)	2,202			3,554					(2,674		)
Income tax expense	—			(260		)	—			—					(260		)
Net (loss) income from continuing operations	(3,723		)	(4,967		)	2,202			3,554					(2,934		)
Income from operations of disposal groups, net of tax	—			(582		)	—			—					(582		)
Net (loss) income	(3,723		)	(5,549		)	2,202			3,554					(3,516		)
Net income attributable to noncontrolling interests	—			—			207			—					207
Net (loss) income attributable to the Partnership	$	(3,723	)	$	(5,549	)	$	1,995		$	3,554				$	(3,723	)
	Condensed Consolidating Statements of Operations
	Nine months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Revenue	$	—		$	179,744		$	41,818		$	(4,361	)		$	217,201
Gain on commodity derivatives, net	—			110			—			—				110
Total revenue	—			179,854			41,818			(4,361		)		217,311
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			134,368			32,991			(4,361		)		162,998
Direct operating expenses	—			18,961			3,408			—				22,369
Selling, general and administrative expenses	—			12,507			—			—				12,507
Equity compensation expense	—			1,877			—			—				1,877
Depreciation and accretion expense	—			21,031			1,243			—				22,274
Total operating expenses	—			188,744			37,642			(4,361		)		222,025
Gain on involuntary conversion of property, plant and equipment	—			343			—			—				343
Loss on impairment of property, plant and equipment	—			(15,232		)	—			—				(15,232		)
Operating (loss) income	—			(23,779		)	4,176			—				(19,603		)
(Loss) earnings from consolidated affiliate	(28,396		)	3,643			—			24,753				—
Interest expense	—			(6,958		)	—			—				(6,958		)
Net (loss) income before income tax benefit	(28,396		)	(27,094		)	4,176			24,753				(26,561		)
Income tax benefit	—			589			—			—				589
Net (loss) income from continuing operations	(28,396		)	(26,505		)	4,176			24,753				(25,972		)
Loss from operations of disposal groups, net of tax	—			(1,891		)	—			—				(1,891		)
Net (loss) income	(28,396		)	(28,396		)	4,176			24,753				(27,863		)
Net income attributable to noncontrolling interests	—			—			533			—				533
Net (loss) income attributable to the Partnership	$	(28,396	)	$	(28,396	)	$	3,643		$	24,753			$	(28,396	)
	Condensed Consolidating Statements of Comprehensive Income
	Three months ended September 30, 2014
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net (loss) income	$	(2,456	)	$	(3,037	)	$	606		$	2,464			$	(2,423	)
Unrealized gain on post retirement benefit plan assets and liabilities	7			7			—			(7		)		7
Comprehensive (loss) income	(2,449		)	(3,030		)	606			2,457				(2,416		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			33			—				33
Comprehensive (loss) income attributable to the Partnership	$	(2,449	)	$	(3,030	)	$	573		$	2,457			$	(2,449	)
	Condensed Consolidating Statements of Comprehensive Income
	Three months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net (loss) income	$	(2,731	)	$	(2,731	)	$	1,439		$	1,482			$	(2,541	)
Unrealized loss on post retirement benefit plan assets and liabilities	(34		)	(34		)	—			34				(34		)
Comprehensive (loss) income	(2,765		)	(2,765		)	1,439			1,516				(2,575		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			190			—				190
Comprehensive (loss) income attributable to the Partnership	$	(2,765	)	$	(2,765	)	$	1,249		$	1,516			$	(2,765	)
	Condensed Consolidating Statements of Comprehensive Income
	Nine months ended September 30, 2014
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net (loss) income	$	(3,723	)	$	(5,549	)	$	2,202		$	3,554			$	(3,516	)
Unrealized loss on post retirement benefit plan assets and liabilities	53			53			—			(53		)		53
Comprehensive (loss) income	(3,670		)	(5,496		)	2,202			3,501				(3,463		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			207			—				207
Comprehensive (loss) income attributable to the Partnership	$	(3,670	)	$	(5,496	)	$	1,995		$	3,501			$	(3,670	)
	Condensed Consolidating Statements of Comprehensive Income
	Nine months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
Net (loss) income	$	(28,396	)	$	(28,396	)	$	4,176		$	24,753			$	(27,863	)
Unrealized loss on post retirement benefit plan assets and liabilities	(90		)	(90		)	—			90				(90		)
Comprehensive (loss) income	(28,486		)	(28,486		)	4,176			24,843				(27,953		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			533			—				533
Comprehensive (loss) income attributable to the Partnership	$	(28,486	)	$	(28,486	)	$	3,643		$	24,843			$	(28,486	)
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	'
		Condensed Consolidating Statements of Cash Flows
		Nine months ended September 30, 2014
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
	Net cash provided by operating activities	$	—		$	14,555		$	3,685		$	—			$	18,240
	Cash flows from investing activities
	Cost of acquisitions, net of cash acquired	—			(110,909		)	—			—				(110,909		)
	Additions to property, plant and equipment	—			(40,653		)	(604		)	—				(41,257		)
	Proceeds from disposals of property, plant and equipment	—			6,323			—			—				6,323
	Equity method investment	—			(12,000		)	—			—				(12,000		)
	Proceeds from equity method investment, return of capital	—			983			—			—				983
	Net contributions from affiliates	19,549			—			—			(19,549		)		—
	Net distributions to affiliates	(237,231		)	—			—			237,231				—
	Net cash (used in) by investing activities	(217,682		)	(156,256		)	(604		)	217,682				(156,860		)
	Cash flows from financing activities
	Net contributions from affiliates	—			237,231			—			(237,231		)		—
	Net distributions to affiliates	—			(16,741		)	(2,808		)	19,549				—
	Proceeds from issuance of common units, net of offering costs	204,335			—			—			—				204,335
	Unit holder contributions	2,896			—			—			—				2,896
	Unit holder distributions	(19,549		)	—			—			—				(19,549		)
	Issuance of Series B Units	30,000			—			—			—				30,000
	Acquisition of noncontrolling interest	—			(8		)	—			—				(8		)
	Net distributions to noncontrolling interest owners	—			—			(273		)	—				(273		)
	LTIP tax netting unit repurchase	—			(253		)	—			—				(253		)
	Deferred debt issuance costs	—			(3,380		)	—			—				(3,380		)
	Payments on other debt	—			(2,217		)	—			—				(2,217		)
	Borrowings on other debt	—			170			—			—				170
	Payments on long-term debt	—			(212,670		)	—			—				(212,670		)
	Borrowings on long-term debt	—			139,635			—			—				139,635
	Net cash provided by (used in) financing activities	217,682			141,767			(3,081		)	(217,682		)		138,686
	Net increase in cash and cash equivalents	—			66			—			—				66
	Cash and cash equivalents
	Beginning of period	1			392			—			—				393
	End of period	$	1		$	458		$	—		$	—			$	459
	Supplemental cash flow information
	Interest payments, net	$	—		$	4,064		$	—		$	—			$	4,064
	Supplemental non-cash information
	Increase in accrued property, plant and equipment	$	—		$	17,746		$	—		$	—			$	17,746
	Accrued unitholder distribution for Series A Units	$	9,925		$	—		$	—		$	—			$	9,925
	In-kind unitholder distribution for Series B Units	$	1,671		$	—		$	—		$	—			$	1,671
		Condensed Consolidating Statements of Cash Flows
		Nine months ended September 30, 2013
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments				Consolidated
	Net cash provided by operating activities	$	—		$	11,413		$	4,174		$	—			$	15,587
	Cash flows from investing activities
	Additions to property, plant and equipment	—			(22,841		)	(1		)	—				(22,842		)
	Insurance proceeds from involuntary conversion of property, plant and equipment	—			482			—			—				482
	Net contributions from affiliates	12,458			—			—			(12,458		)		—
	Net distributions to affiliates	(27,468		)	—			—			27,468				—
	Net cash (used in) investing activities	(15,010		)	(22,359		)	(1		)	15,010				(22,360		)
	Cash flows from financing activities
	Net contributions from affiliates	—			27,468			—			(27,468		)		—
	Net distributions to affiliates	—			(8,856		)	(3,602		)	12,458				—
	Unit holder contributions	13,075			—			—			—				13,075
	Unit holder distributions	(12,458		)	—			—			—				(12,458		)
	Issuance of Series A Convertible Preferred Units	14,393			—			—			—				14,393
	Net distributions to noncontrolling interest owners	—			—			(571		)	—				(571		)
	LTIP tax netting unit repurchase	—			(400		)	—			—				(400		)
	Deferred debt issuance costs	—			(1,509		)	—			—				(1,509		)
	Payments on other debt	—			(2,231		)	—			—				(2,231		)
	Borrowings on other debt	—			1,495			—			—				1,495
	Payments on bank loans	—			(1,072		)	—			—				(1,072		)
	Borrowings on bank loans	—			6,200			—			—				6,200
	Payments on long-term debt	—			(99,821		)	—			—				(99,821		)
Borrowings on long-term debt	—			92,571			—			—				92,571
Net cash provided by (used in) financing activities	15,010			13,845			(4,173		)	(15,010		)		9,672
Net decrease in cash and cash equivalents	—			2,899			—			—				2,899
Cash and cash equivalents
Beginning of period	1			575			—			—				576
End of period	$	1		$	3,474		$	—		$	—			$	3,475
Supplemental cash flow information
Interest payments, net	$	—		$	5,051		$	—		$	—			$	5,051
Supplemental non-cash information
Decrease in accrued property, plant and equipment	$	—		$	(6,080	)	$	—		$	—			$	(6,080	)
Net assets contributed	22,129			—			—			—				22,129
Net assets contributed in exchange for the issuance of Series A convertible preferred units	59,994			—			—			—				59,994
Fair value of Series A Units in excess of net assets received	15,612			—			—			—				15,612
Accrued unitholder distribution for Series A Units	2,912			—			—			—				2,912

Organization_and_Basis_of_Pres2

Organization and Basis of Presentation (Details) (USD $)

3 Months Ended

6 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Aug. 20, 2014

Jan. 29, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Oct. 24, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Jan. 31, 2014

Mar. 31, 2014

Sep. 30, 2014

counties

counties

HPGT System [Member]

Midla System [Member]

Ala Tenn System [Member]

Partnership Interest [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Burns Point Plant [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Producers

mi

mi

mi

Meters

Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]

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'

Length of pipeline

'

'

'

'

'

'

'

'

'

400

370

295

'

'

'

'

'

'

'

'

'

'

'

Number of meters

'

'

'

'

'

'

'

'

'

40

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of producers

'

'

'

'

'

'

'

'

'

32

'

'

'

'

'

'

'

'

'

'

'

'

'

County in which entity operates

8

'

'

'

'

8

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of voting interests acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

Payments on long-term debt

'

'

'

'

'

$212,670

$99,821

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Ownership Interests, Units Outstanding

'

'

'

'

'

'

'

'

'

'

'

'

185,000

'

'

'

'

'

'

'

'

'

'

Unitholder contributions

'

'

'

'

'

2,964

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

Partners' Capital Account, Public Sale of Units Net of Offering Costs

119,300

'

204,335

'

86,900

-204,335

0

'

'

'

'

'

'

'

'

'

0

'

-30,000

0

'

'

'

Limited Partners' Capital Account, Units Issued

'

'

'

'

'

'

'

4,622,352

3,400,000

'

'

'

'

'

'

'

'

'

'

'

1,168,225

'

'

Sale of Stock, Price Per Share

'

'

'

'

'

'

'

$25.81

$26.75

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution declared per common unit (a)

$0.46

$0.46

'

$0.43

'

$1.38

$0.87

'

'

'

'

'

'

$1.89

$0.47

'

'

'

'

'

'

'

'

Noncontrolling Interest, Ownership Percentage by Parent

92.20%

'

'

'

'

92.20%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance of Common Limited Partners Units

'

'

'

'

'

$31,671

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$30,000

$31,671

Fair value, paid in kind distributions

$4,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions_and_Divestitures_1

Acquisitions and Divestitures Lavaca Acquisition (Details) (USD $)

3 Months Ended

6 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Aug. 20, 2014

Jan. 29, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Jan. 31, 2014

Mar. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

Lavaca [Member]

Lavaca [Member]

Minimum [Member]

Maximum [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Pipelines [Member]

mi

Lavaca [Member]

Lavaca [Member]

Lavaca [Member]

hp

in

in

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total Revenue

$70,305,000

'

$77,519,000

'

$228,223,000

$217,311,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Purchase Price Allocation, Land

'

'

'

'

'

'

'

'

2,000

2,000

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment

'

'

'

'

'

'

'

'

59,492,000

59,492,000

'

'

'

'

'

'

'

'

58,737,000

Length of pipeline

'

'

'

'

'

'

'

'

120

'

'

'

'

'

'

'

'

'

'

Diameters Length Ranging

'

'

'

'

'

'

'

'

'

'

4

8

'

'

'

'

'

'

'

Compressor Stations Compression Capacity Horsepower

'

'

'

'

'

'

'

'

9,000

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Public Sale of Units Net of Offering Costs

119,300,000

204,335,000

'

86,900,000

-204,335,000

0

'

'

'

'

'

'

0

-30,000,000

0

'

'

'

'

Proceeds from Issuance of Common Limited Partners Units

'

'

'

'

31,671,000

'

'

'

'

'

'

'

'

'

'

'

30,000,000

31,671,000

'

Limited Partners' Capital Account, Units Issued

'

'

'

'

'

'

4,622,352

3,400,000

'

'

'

'

'

'

'

1,168,225

'

'

'

Finite-Lived Intangible Asset, Useful Life

'

'

'

'

'25 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months

1,500,000

'

'

'

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Inputs, Discount Rate

'

'

'

'

10.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Purchase Price Allocation, Equipment

'

'

'

'

'

'

'

'

753,000

753,000

'

'

'

'

'

'

'

'

'

Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets

'

'

'

'

'

'

'

'

44,917,000

44,917,000

'

'

'

'

'

'

'

'

'

Business Acquisition, Cost of Acquired Entity, Purchase Price

6,500,000

'

'

'

6,500,000

'

'

'

104,409,000

104,409,000

'

'

'

'

'

'

'

'

'

Business Acquisition, Pro Forma Revenue

'

'

'

'

'

'

'

'

4,500,000

10,600,000

'

'

'

'

'

'

'

'

'

Business Acquisition, Pro Forma Net Income (Loss)

'

'

'

'

'

'

'

'

2,300,000

4,500,000

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Parent

($2,456,000)

'

($2,731,000)

'

($3,723,000)

($28,396,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions_and_Divestitures_2

Acquisitions and Divestitures Other Acquisition (Details) (USD $)	Sep. 30, 2014
In Millions, unless otherwise specified
Business Acquisition [Line Items]	'
Business Acquisition, Cost of Acquired Entity, Purchase Price	$6.50

Acquisitions_and_Divestitures_3

Acquisitions and Divestitures Blackwater Acquisition (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 17, 2013

Terminals [Member]

Terminals [Member]

Terminals [Member]

Terminals [Member]

Terminals reporting segment [Member]

Terminals reporting segment [Member]

Terminals reporting segment [Member]

Terminals [Member]

Terminals [Member]

Terminals [Member]

bbl

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Million barrels of storage capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

1,700,000

Business Acquisition, Pro Forma Revenue

'

'

'

'

'

'

'

'

$3,458,000

'

$6,326,000

'

'

'

Total Revenue

70,305,000

77,519,000

228,223,000

217,311,000

3,800,000

'

'

'

'

11,314,000

'

3,802,000

11,300,000

'

Business Acquisition, Pro Forma Net Income (Loss)

'

'

'

'

$700,000

$100,000

$1,100,000

$700,000

'

'

'

'

'

'

Acquisitions_and_Divestitures_4

Acquisitions and Divestitures High Point Acquisition (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Apr. 15, 2013
			mi
Business Acquisition [Line Items]	'	'	'	'	'
Total Revenue	$70,305	$77,519	$228,223	$217,311	'
Net Income (Loss) Attributable to Parent	-2,456	-2,731	-3,723	-28,396	'
High Point Infrastructure Partners, LLC [Member]	'	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'	'
Percentage of voting interests acquired	'	'	'	'	100.00%
Length of pipeline	'	'	700	'	'
Total Revenue	6,400	10,700	22,400	19,700	'
Net Income (Loss) Attributable to Parent	$2,600	$1,200	$10,400	$2,700	'
ArcLight [Member] | High Point Infrastructure Partners, LLC [Member]	'	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'	'
Number of Natural Gas Collection Receipt Points	'	'	75	'	'

Acquisitions_and_Divestitures_5

Acquisitions and Divestitures Madison Divestiture (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2013
					Madison [Member]	Madison [Member]
Significant Acquisitions and Disposals [Line Items]	'	'	'	'	'	'
Proceeds from disposals of property, plant and equipment	'	'	$6,323	$0	$6,100	'
Loss on impairment of property, plant and equipment	0	0	0	15,232	'	3,000
Property, Plant and Equipment, Gross	'	'	'	'	'	$6,100

Acquisitions_and_Divestitures_6

Acquisitions and Divestitures MPOG Acquisition (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Payments to Acquire Equity Method Investments	'	'	$12,000	$0
Earnings in unconsolidated affiliate	117	0	117	0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	1,100	'	983	0
Equity Method Investments [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Equity Method Investment, Ownership Percentage	66.70%	'	66.70%	'
Payments to Acquire Equity Method Investments	'	'	12,000	'
Earnings in unconsolidated affiliate	'	'	$100	'

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Loss on impairment of noncurrent assets held for sale	$700	'	$673	$1,807	'
Disposal Group, Including Discontinued Operation, Revenue	13	591	461	1,717	'
Disposal Group, Including Discontinued Operation, Operating Expense	-55	-606	-599	-1,801	'
Disposal Group, Including Discontinued Operation, Impairment	0	0	-673	-1,807	'
Unbilled revenue	21,271	'	21,271	'	23,001
Property, Plant and Equipment, Net	415,799	'	415,799	'	312,701
Gas Purchase Payable, Current	14,762	'	14,762	'	17,386
Discontinued Operation, Tax Effect of Discontinued Operation	16	0	316	0	'
Loss from operations of disposal groups, net of tax	-26	-15	-582	-1,891	'
Loss from discontinued operations	$0	$0.01	($0.05)	($0.21)	'
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	0	-87	0	'
Disposal Groups, Including Discontinued Operations, Name [Domain]	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Loss on impairment of noncurrent assets held for sale	$400	'	'	'	'

Concentration_of_Credit_Risk_a2

Concentration of Credit Risk and Trade Accounts Receivable (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Concentration Risk [Line Items]	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	100.00%	100.00%	100.00%	100.00%
Customer A [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	24.00%	27.00%	26.00%	29.00%
Customer B [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	14.00%	13.00%	14.00%	12.00%
Cusotmer C [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	10.00%	13.00%	10.00%	13.00%
Cusotmer D [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	0.00%	0.00%	10.00%	0.00%
Customer Other [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	52.00%	47.00%	40.00%	46.00%

Derivatives_Fair_Value_of_Comm

Derivatives (Fair Value of Commodity Derivatives) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Gross Risk Management Assets	$1,047	$473
Gross Risk Management Liabilities	0	0
Net Risk Management Assets (Liabilities)	1,047	473
Gross Risk Management Assets	0	27
Gross Risk Management Liabilities	-335	-551
Net Risk Management Assets (Liabilities)	335	524
Risk Management Assets [Member] | Commodity derivatives [Member]	'	'
Derivative [Line Items]	'	'
Gross Risk Management Assets	1,047	473
Gross Risk Management Liabilities	0	0
Net Risk Management Assets (Liabilities)	1,047	473
Risk Management Assets - Long Term [Member] | Commodity derivatives [Member]	'	'
Derivative [Line Items]	'	'
Gross Risk Management Assets	0	0
Gross Risk Management Liabilities	0	0
Net Risk Management Assets (Liabilities)	0	0
Risk Management Liabilities [Member] | Commodity derivatives [Member]	'	'
Derivative [Line Items]	'	'
Gross Risk Management Assets	0	27
Gross Risk Management Liabilities	-335	-450
Net Risk Management Assets (Liabilities)	335	423
Risk Management Liabilities - Long Term [Member] | Commodity derivatives [Member]	'	'
Derivative [Line Items]	'	'
Gross Risk Management Assets	0	0
Gross Risk Management Liabilities	0	-101
Net Risk Management Assets (Liabilities)	$0	$101

Derivatives_Realized_and_Unrea

Derivatives (Realized and Unrealized Gains (Losses)) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Commodity derivatives [Member]	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Derivative, Loss on Derivative	($359)	'	($1,307)	'
Derivative, Cash Received on Hedge	'	124	'	-318
Gain on commodity derivatives, net	706	-913	592	-1,158
Gain (Loss) on Derivative Instruments [Member] | Commodity derivatives [Member]	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Derivative, Loss on Derivative	-9	'	-191	'
Derivative, Cash Received on Hedge	'	-261	'	-797
Gain on commodity derivatives, net	615	-760	474	-687
Interest Expense [Member]	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Derivative, Loss on Derivative	-109	'	-322	'
Derivative, Cash Received on Hedge	'	101	'	101
Gain on commodity derivatives, net	91	-153	118	-471
Other Income [Member]	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Derivative, Loss on Derivative	-241	-284	-794	-378
Gain on commodity derivatives, net	$0	$0	$0	$0

Derivatives_Details_Textual

Derivatives (Details Textual) (USD $)	9 Months Ended				3 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013
			gal	Interest Rate Swap [Member]	Weather Contract [Member]	Weather Contract [Member]
Derivative [Line Items]	'	'	'	'	'	'
Aggregate notional volume of our commodity derivative	'	'	3,500,000	'	'	'
Notional amount of interest rate swap	'	'	'	$100,000,000	'	'
Potential proceeds from derivative contract	'	'	'	'	'	10,000,000
Fair value of derivative	'	'	'	'	'	0
Payment for weather derivative premium	'	'	'	'	-1,100,000	-1,000,000
Derivative term of contract	'	'	'	'	'1 year 0 months 0 days	'
Amortization of weather derivative premium	$794,000	$378,000	'	'	$600,000	'

Fair_Value_Measurement_Details

Fair Value Measurement (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commodity Contract [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	$404	($70)
Commodity Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	404	-70
Commodity Contract [Member] | Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	0	0
Commodity Contract [Member] | Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	404	-70
Commodity Contract [Member] | Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	0	0
Interest Rate Swap [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	-335	-454
Interest Rate Swap [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	-335	-454
Interest Rate Swap [Member] | Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	0	0
Interest Rate Swap [Member] | Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	-335	-454
Interest Rate Swap [Member] | Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Estimated Fair Value	$0	$0

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

In Thousands, unless otherwise specified

Land [Member]

Land [Member]

Construction in progress [Member]

Construction in progress [Member]

Base gas [Member]

Base gas [Member]

Buildings and improvements [Member]

Buildings and improvements [Member]

Processing and treating plants [Member]

Processing and treating plants [Member]

Pipelines [Member]

Pipelines [Member]

Compressors [Member]

Compressors [Member]

Equipment [Member]

Equipment [Member]

Computer software [Member]

Computer software [Member]

Property, Plant And Equipment [Member]

Property, Plant And Equipment [Member]

Dock [Member]

Dock [Member]

Tanks, truck rack and piping [Member]

Tanks, truck rack and piping [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Buildings and improvements [Member]

Processing and treating plants [Member]

Pipelines [Member]

Compressors [Member]

Equipment [Member]

Computer software [Member]

Buildings and improvements [Member]

Processing and treating plants [Member]

Pipelines [Member]

Compressors [Member]

Equipment [Member]

Property, Plant and Equipment, Net [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property plant and equipment gross

'

'

$6,133

$6,015

$44,707

$6,443

$1,108

$1,108

$5,522

$5,109

$98,291

$97,106

$304,771

$239,865

$18,185

$11,955

$8,645

$6,294

$3,696

$3,531

'

$407,800

$8,004

$7,942

$24,390

$22,432

'

'

'

'

'

'

'

'

'

'

'

Property plant and equipment in useful life

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'40 years

'40 years

'40 years

'20 years

'20 years

'5 years

'4 years

'8 years

'5 years

'4 years

'8 years

Accumulated depreciation

-107,653

-95,099

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment, net

$415,799

$312,701

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$523,452

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property_Plant_and_Equipment_D1

Property, Plant and Equipment (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
					AlaTenn system [Member]	AlaTenn system [Member]
Property, Plant and Equipment [Line Items]	'	'	'	'	'	'
Property plant and equipment gross	'	'	'	'	$101,500,000	$100,500,000
Capitalized interest	300,000	100,000	400,000	100,000	'	'
Depreciation	4,600,000	6,500,000	15,700,000	18,900,000	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	0	482,000	'	'
Gain on involuntary conversion of property, plant and equipment	$0	$0	$0	$343,000	'	'

Asset_Retirement_Obligations_D

Asset Retirement Obligations (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]	'	'
Restricted Cash and Cash Equivalents	$3,000,000	'
Asset Retirement Obligation	34,782,000	34,636,000
Asset Retirement Obligation, Liabilities Incurred	248,000	'
Asset Retirement Obligation, Liabilities Settled	-690,000	'
Asset Retirement Obligation, Accretion Expense	$588,000	'

Debt_Obligations_Details

Debt Obligations (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Revolving credit facility	$57,700	$130,735
Other debt	1	2,048
Long-term debt	57,701	132,783
Less: current portion	1	2,048
Long- term debt	$57,700	$130,735

Debt_Obligations_Details_Textu

Debt Obligations (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Mar. 31, 2013
Debt Instrument [Line Items]	'	'	'	'
Line of Credit Facility, Amount Outstanding Limit	$500,000,000	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Letter of credit outstanding	4,200,000	'	4,800,000	'
Payments on long-term debt	212,670,000	99,821,000	'	'
Revolving credit facility	57,700,000	'	130,735,000	'
Ratio of Indebtedness to Net Capital	1.49	'	'	'
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%	'	'	'
Debt Instrument, Interest Coverage Ratio	2.5	'	'	'
Document Fiscal Year Focus	'2014	'	'	'
Debt, Weighted Average Interest Rate	4.38%	'	'	4.50%
Line of Credit Facility, Remaining Borrowing Capacity	135,200,000	'	'	'
Proceeds from (Payments for) Other Financing Activities	2,500,000	'	'	'
Debt Instrument, Periodic Payment	300,000	'	'	'
Debt Issuance Cost	10,100,000	'	'	'
Gains (Losses) on Extinguishment of Debt	$700,000	'	'	'
Maximum [Member]	'	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Ratio of Indebtedness to Net Capital	4.75	'	'	'
Ratio of indebtedness to net capital, after permitted acquisition	5.25	'	'	'
Federal Funds [Member]	'	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	0.50%	'	'	'
Eurodollar [Member]	'	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	1.00%	'	'	'
Insurance Premium Financing [Member]	'	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	3.95%	'	'	'
Fiscal Quarter Ending December 31, 2014 [Member] | Debt Instrument, Fourth Amendment [Member] | Base Rate [Member] | Maximum [Member]	'	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Debt Instrument, Basis Spread on Variable Rate	3.25%	'	'	'
Fiscal Quarter Ending December 31, 2014 [Member] | Debt Instrument, Fourth Amendment [Member] | Base Rate [Member] | Minimum [Member]	'	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Debt Instrument, Basis Spread on Variable Rate	2.00%	'	'	'
Fiscal Quarter Ending December 31, 2014 [Member] | Debt Instrument, Fourth Amendment [Member] | Eurodollar [Member] | Maximum [Member]	'	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Debt Instrument, Basis Spread on Variable Rate	2.25%	'	'	'
Fiscal Quarter Ending December 31, 2014 [Member] | Debt Instrument, Fourth Amendment [Member] | Eurodollar [Member] | Minimum [Member]	'	'	'	'
Long-Term Debt (Textual) [Abstract]	'	'	'	'
Debt Instrument, Basis Spread on Variable Rate	1.00%	'	'	'

Partners_Capital_Details

Partners' Capital (Details) (USD $)

3 Months Ended

6 Months Ended

9 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Nov. 06, 2014

Aug. 20, 2014

Feb. 07, 2014

Jan. 29, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Nov. 06, 2014

Jan. 31, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

AIM Midstream Holdings No. of units outstanding [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Limited Partner Series B Convertible Units [Member]

Limited Partner Series B Convertible Units [Member]

Limited Partner Common Units [Member]

Limited Partner Common Units [Member]

Document Fiscal Year Focus

'

'

'

'

'

'2014

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited Partners' Capital Account, Units Issued

'

'

'

'

'

'

'

'

4,622,352

'

3,400,000

'

'

'

'

'

1,168,225

'

1,232,017

0

15,770,822

7,414,077

Temporary Equity, Shares Outstanding

5,585,611

'

'

'

'

5,585,611

'

5,585,611

'

'

'

5,279,000

'

'

'

'

'

'

'

'

'

'

General partner interest units

298,582

'

'

'

'

298,582

'

'

'

'

'

185,451

'

'

'

'

'

'

'

'

'

'

Limited Partners' Capital Account, Units Outstanding

'

'

'

'

'

'

'

'

'

'

'

'

7,414,000

'

'

1,232,017

'

0

1,232,017

0

15,770,822

7,414,077

Limited partner subordinated units

'

'

'

'

'

'

'

'

'

'

'

'

185,000

'

'

'

'

'

'

'

'

'

General partner interest, units issued

298,582

'

'

'

'

298,582

'

'

'

113,131

'

185,451

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Price Per Share

'

'

'

'

'

'

'

'

$25.81

'

$26.75

'

'

'

'

'

'

'

'

'

'

'

Distribution declared per common unit (a)

$0.46

$0.46

'

$0.43

'

$1.38

$0.87

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Public Sale of Units Net of Offering Costs

$119,300

'

$204,335

'

$86,900

($204,335)

$0

'

'

'

'

'

'

($30,000)

$0

'

'

'

'

'

'

'

Partners_Capital_Details_Textu

Partners Capital (Details Textual) (USD $)

3 Months Ended

6 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Aug. 20, 2014

Feb. 21, 2014

Feb. 07, 2014

Feb. 05, 2014

Jan. 29, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Jan. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Partnership Interest [Member]

Series B [Member]

Series B [Member]

Limited Partner [Member]

Limited Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Series B [Member]

Dividend Declared [Member]

Dividend Declared [Member]

Dividend Paid [Member]

General Partner [Member]

General Partner [Member]

Series B [Member]

Subsidiary, Sale of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Limited Partner, Cash Distributions Paid

$5,800,000

'

$4,700,000

'

$19,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unitholder distributions

'

'

'

'

19,549,000

12,458,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants Not Settleable in Cash, Fair Value Disclosure

'

'

'

'

'

'

'

23.89

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Incentive Distribution, Distribution

500,000

'

'

'

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Distributions

'

'

'

'

29,825,000

16,672,000

'

'

'

'

'

'

'

0

0

27,968,000

16,332,000

603,000

80,000

1,857,000

340,000

619,000

0

1,671,000

0

'

'

1,688,000

240,000

'

Partners Capital (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

General partner interest

'

'

'

'

1.30%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest

'

'

'

'

98.70%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments on long-term debt

'

'

'

'

212,670,000

99,821,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Series A convertible preferred units

104,736,000

'

'

'

104,736,000

'

'

'

'

'

'

94,811,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited Partners' Capital Account, Units Issued

'

'

'

'

'

'

4,622,352

'

'

'

3,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,168,225

'

'

'

63,972

Partners' Capital Account, Private Placement of Units

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,700,000

'

'

'

Other Ownership Interests, Units Outstanding

'

'

'

'

'

'

'

'

'

'

'

'

185,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unitholder contributions

'

'

'

'

2,964,000

'

'

'

'

'

'

'

'

0

0

0

0

'

'

2,964,000

35,196,000

'

'

'

'

'

'

'

'

'

Series B Conversion Period

'

'

'

'

'2 years 0 months 0 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Price Per Share

'

'

'

'

'

'

$25.81

'

'

'

$26.75

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Public Sale of Units Net of Offering Costs

119,300,000

204,335,000

'

86,900,000

-204,335,000

0

'

'

'

'

'

'

'

0

'

204,335,000

'

'

'

0

'

'

'

-30,000,000

0

'

'

'

'

'

Accrued and in-kind unitholder distribution for Series A Units

'

'

'

'

9,925,000

2,912,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value, paid in kind distributions

$4,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

General Partners' Capital Account, Units Issued

298,582

'

'

'

298,582

'

'

'

113,131

'

'

185,451

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

'

'

'

'

'

'

'

300,000

'

300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants

'

'

'

'

$0

'

'

'

'

'

'

'

'

$0

'

$7,164,000

'

'

'

$7,164,000

'

'

'

'

'

'

'

'

'

'

Class of Warrant or Right, Exercise Price of Warrants or Rights

'

'

'

'

'

'

'

'

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners_Capital_Calculation_o

Partners' Capital (Calculation of Net Income (Loss) Per Limited Partner Unit) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
Document Fiscal Year Focus	'	'	'2014	'
Distribution Made to Limited Partner, Cash Distributions Paid	$5,800	$4,700	$19,500	'
Income (Loss) from Continuing Operations Attributable to Parent	-2,430	-2,716	-3,141	-26,505
Temporary Equity, Dividends, Adjustment	4,165	2,873	11,263	20,899
Income (loss) from Discontinued Operations, Net of Tax, Available to Limited Partners	-26	38	-574	-1,742
Net Income (Loss) Allocated to Limited Partners, Diluted	-7,674	-5,341	-17,907	-47,776
Net loss from continuing operations	-2,397	-2,526	-2,934	-25,972
General partner's distribution	'	'	29,825	16,672
Limited partners’ net (loss) income from continuing operations per unit (basic)	($0.58)	($0.81)	($1.52)	($5.52)
Loss from discontinued operations	$0	$0.01	($0.05)	($0.21)
Limited partners’ net (loss) income per unit (basic)	($0.58)	($0.80)	($1.57)	($5.73)
General Partners' Capital Account, Period Undistributed Income (Loss) From Continuing Operations, Amount	-169	-290	-430	-1,610
Net Income (Loss) From Continuing Operatins, Attributable to Limited Partners	-7,648	-5,379	-17,333	-46,034
Series B [Member]	'	'	'	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
General partner's distribution	619	0	1,671	0
General Partner [Member]	'	'	'	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
General partner's distribution	603	80	1,857	340
Dividend Declared [Member] | General Partner [Member]	'	'	'	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
General partner's distribution	'	'	$1,688	$240

LongTerm_Incentive_Plan_Detail

Long-Term Incentive Plan (Details) (USD $)	9 Months Ended		12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	693,410	'	855,089
Grants Issued Under Long Term Incentive Plan	'	'	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$1.20	$1.60	'
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$3.40	$1.10	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$19,670	'	$17,620
Table Summarizes Unit Based Awards	'	'	'
Outstanding, Beginning period	75,529,000	'	'
Granted	183,163,000	'	'
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$20,680	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	-12,009,000	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$18,280	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	43,986,000	'	'
LTIP vesting, Shares	($20,720)	'	'
Outstanding, Ending period	202,697,000	'	75,529,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	'	'	'3 years 3 months

Income_Tax_Details

Income Tax (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Income tax (expense) benefit	($122)	$214	($260)	$589
Effective Income Tax Rate, Continuing Operations	-5.40%	7.80%	-9.70%	2.20%

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	9 Months Ended					3 Months Ended	12 Months Ended
	Sep. 30, 2014	Feb. 21, 2014	Feb. 05, 2014	Feb. 05, 2014	Feb. 05, 2014	Sep. 30, 2014	Dec. 31, 2013
				AIM Midstream Holdings [Member]	High Point Infrastructure Partners, LLC [Member]	High Point Infrastructure Partners, LLC [Member]	High Point Infrastructure Partners, LLC [Member]
Registration Payment Arrangement [Line Items]	'	'	'	'	'	'	'
Loss Contingency, Damages Sought	'1.8	'	'	'	'	'	'
Partners' Capital Account, Percentage	'	'	'	5.00%	95.00%	'	'
Incentive Distribution Right Allocation	'	'	'	'	'	100.00%	85.02%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	'	300,000	300,000	'	'	'	'
Class of Warrant or Right, Exercise Price of Warrants or Rights	'	'	$0.01	'	'	'	'

Related_Party_Transactions_Det

Related- Party Transactions (Details Textual) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Related Party Transaction [Line Items]	'	'	'	'
Management Fees Revenue	$0.20	'	$0.30	'
American Midstream, L.L.C [Member]	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'
General and Administrative Expense	5.7	3.3	15.9	10.3
Business Development	$0.20	$0.20	$1	$0.60

Reporting_Segments_Details

Reporting Segments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment information	'	'	'	'
Revenue	$69,699,000	$78,018,000	$227,940,000	$217,201,000
(Loss) gain on commodity derivatives, net	606,000	-499,000	283,000	110,000
Total Revenue	70,305,000	77,519,000	228,223,000	217,311,000
Purchases of natural gas, NGLs and condensate	46,690,000	55,765,000	155,729,000	162,998,000
Direct operating expenses	-11,884,000	-9,092,000	-31,889,000	-22,369,000
Selling, general and administrative expenses	5,875,000	4,494,000	17,105,000	12,507,000
Depreciation, amortization and accretion expense	5,706,000	7,880,000	19,350,000	22,274,000
Total operating expenses	70,492,000	77,623,000	225,205,000	222,025,000
Gain on involuntary conversion of property, plant and equipment	0	0	0	343,000
Loss on sale of assets, net	-103,000	0	-124,000	0
Loss on impairment of property, plant and equipment	0	0	0	15,232,000
Loss from operations of disposal groups, net of tax	-26,000	-15,000	-582,000	-1,891,000
Interest expense	-1,430,000	-2,636,000	-5,013,000	-6,958,000
Earnings in unconsolidated affiliate	117,000	0	117,000	0
Income Tax Expense (Benefit), Continuing Operations	122,000	-214,000	260,000	-589,000
Net loss	-2,423,000	-2,541,000	-3,516,000	-27,863,000
Net loss attributable to the Partnership	-2,456,000	-2,731,000	-3,723,000	-28,396,000
Segment Gross Margin	21,332,000	20,908,000	66,580,000	51,932,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	'	'	53,000	'
Gathering and Processing reporting segment [Member]	'	'	'	'
Segment information	'	'	'	'
Revenue	45,569,000	52,082,000	147,209,000	154,336,000
(Loss) gain on commodity derivatives, net	606,000	-499,000	283,000	110,000
Total Revenue	46,175,000	51,583,000	147,492,000	154,446,000
Purchases of natural gas, NGLs and condensate	35,024,000	41,180,000	115,383,000	125,888,000
Direct operating expenses	-5,249,000	-3,805,000	-15,163,000	-10,924,000
Segment Gross Margin	10,513,000	10,879,000	31,122,000	28,812,000
Transmission reporting segment [Member]	'	'	'	'
Segment information	'	'	'	'
Revenue	20,328,000	22,478,000	69,417,000	56,539,000
(Loss) gain on commodity derivatives, net	0	0	0	0
Total Revenue	20,328,000	22,478,000	69,417,000	56,539,000
Purchases of natural gas, NGLs and condensate	11,666,000	14,585,000	40,346,000	37,110,000
Direct operating expenses	-5,033,000	-3,994,000	-11,887,000	-8,943,000
Segment Gross Margin	8,619,000	7,864,000	28,983,000	19,296,000
Terminals [Member]	'	'	'	'
Segment information	'	'	'	'
Total Revenue	3,802,000	'	11,300,000	'
Terminals reporting segment [Member]	'	'	'	'
Segment information	'	'	'	'
Revenue	3,802,000	3,458,000	11,314,000	6,326,000
(Loss) gain on commodity derivatives, net	0	0	0	0
Total Revenue	'	'	11,314,000	'
Purchases of natural gas, NGLs and condensate	0	0	0	0
Direct operating expenses	-1,602,000	-1,293,000	-4,839,000	-2,502,000
Segment Gross Margin	$2,200,000	$2,165,000	$6,475,000	$3,824,000

Reporting_Segments_Details_Tex

Reporting Segments (Details Textual)	9 Months Ended
	Sep. 30, 2014
	segment
Segment Reporting Information [Line Items]	'
Number of Operating Segments	3

Subsidiary_Guarantors_Details

Subsidiary Guarantors (Details) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2011	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Payments to Acquire Equity Method Investments	'	'	'	'	$12,000,000	$0	'	'	'
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	1,100,000	'	'	'	983,000	0	'	'	'
Investment in unconsolidated affiliate	11,017,000	'	'	'	11,017,000	'	'	0	'
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	'	'	'	'	'	'	100.00%	'	'
Net Cash Provided by (Used in) Operating Activities	'	'	'	'	-18,240,000	-15,587,000	'	'	'
Revenue, Net	69,699,000	'	78,018,000	'	227,940,000	217,201,000	'	'	'
Cash and Cash Equivalents, at Carrying Value	459,000	'	'	'	459,000	'	'	393,000	'
Accounts Receivable, Net, Current	7,430,000	'	'	'	7,430,000	'	'	6,822,000	'
Unbilled revenue	21,271,000	'	'	'	21,271,000	'	'	23,001,000	'
Derivative Assets, Current	1,047,000	'	'	'	1,047,000	'	'	473,000	'
Other Assets, Current	4,715,000	'	'	'	4,715,000	'	'	7,497,000	'
Current assets held for sale	29,000	'	'	'	29,000	'	'	272,000	'
Assets, Current	34,951,000	'	'	'	34,951,000	'	'	38,458,000	'
Derivative Assets, Noncurrent	'	'	'	'	'	'	'	0	'
Property, Plant and Equipment, Net	415,799,000	'	'	'	415,799,000	'	'	312,701,000	'
Notes Receivable, Related Parties, Noncurrent	0	'	'	'	0	'	'	0	'
Goodwill	16,253,000	'	'	'	16,253,000	'	'	16,447,000	'
Intangible assets, net	45,585,000	'	'	'	45,585,000	'	'	3,682,000	'
Other Assets, Noncurrent	11,195,000	'	'	'	11,195,000	'	'	9,064,000	'
Investment In Subsidiaries	0	'	'	'	0	'	'	0	'
Assets	535,964,000	'	'	'	535,964,000	'	'	382,075,000	'
Accounts Payable, Current	12,426,000	'	'	'	12,426,000	'	'	3,261,000	'
Gas Purchase Payable, Current	14,762,000	'	'	'	14,762,000	'	'	17,386,000	'
Less: current portion	1,000	'	'	'	1,000	'	'	2,048,000	'
Risk management liabilities	335,000	'	'	'	335,000	'	'	423,000	'
Current liabilities held for sale	1,000	'	'	'	1,000	'	'	114,000	'
Liabilities, Current	48,950,000	'	'	'	48,950,000	'	'	38,290,000	'
Risk management liabilities	0	'	'	'	0	'	'	101,000	'
Asset Retirement Obligation	34,782,000	'	'	'	34,782,000	'	'	34,636,000	'
Other Liabilities, Noncurrent	161,000	'	'	'	161,000	'	'	191,000	'
Long-term Debt, Excluding Current Maturities	57,700,000	'	'	'	57,700,000	'	'	130,735,000	'
Deferred tax liability	4,816,000	'	'	'	4,816,000	'	'	4,749,000	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	'	'	'	0	'	'	95,000	'
Liabilities	146,409,000	'	'	'	146,409,000	'	'	208,797,000	'
Series A convertible preferred units (5,586 thousand and 5,279 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	104,736,000	'	'	'	104,736,000	'	'	94,811,000	'
Partners' Capital	280,286,000	'	56,015,000	'	280,286,000	56,015,000	'	73,839,000	80,165,000
Total liabilities and partners’ capital	284,819,000	'	'	'	284,819,000	'	'	78,467,000	'
Liabilities and Equity	535,964,000	'	'	'	535,964,000	'	'	382,075,000	'
(Loss) gain on commodity derivatives, net	606,000	'	-499,000	'	283,000	110,000	'	'	'
Total Revenue	70,305,000	'	77,519,000	'	228,223,000	217,311,000	'	'	'
Purchases of natural gas, NGLs and condensate	46,690,000	'	55,765,000	'	155,729,000	162,998,000	'	'	'
Direct Operating Costs	11,884,000	'	9,092,000	'	31,889,000	22,369,000	'	'	'
Selling, General and Administrative Expense	5,875,000	'	4,494,000	'	17,105,000	12,507,000	'	'	'
Allocated Share-based Compensation Expense	337,000	'	392,000	'	1,132,000	1,877,000	'	'	'
Depreciation, amortization and accretion expense	5,706,000	'	7,880,000	'	19,350,000	22,274,000	'	'	'
Total operating expenses	70,492,000	'	77,623,000	'	225,205,000	222,025,000	'	'	'
Gain on involuntary conversion of property, plant and equipment	0	'	0	'	0	343,000	'	'	'
Loss on sale of assets, net	-103,000	'	0	'	-124,000	0	'	'	'
Impairment of Long-Lived Assets Held-for-use	0	'	0	'	0	-15,232,000	'	'	'
Operating income (loss)	-290,000	'	-104,000	'	2,894,000	-19,603,000	'	'	'
Earnings from Consolidated Affiliates	0	'	0	'	0	0	'	'	'
Interest Expense	1,430,000	'	2,636,000	'	5,013,000	6,958,000	'	'	'
Earnings in unconsolidated affiliate	117,000	'	0	'	117,000	0	'	'	'
Other expense	-672,000	'	0	'	-672,000	0	'	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	-2,275,000	'	-2,740,000	'	-2,674,000	-26,561,000	'	'	'
Income tax (expense) benefit	-122,000	'	214,000	'	-260,000	589,000	'	'	'
Net loss from continuing operations	-2,397,000	'	-2,526,000	'	-2,934,000	-25,972,000	'	'	'
Loss from operations of disposal groups, net of tax	-26,000	'	-15,000	'	-582,000	-1,891,000	'	'	'
Net loss	-2,423,000	'	-2,541,000	'	-3,516,000	-27,863,000	'	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	33,000	'	190,000	'	207,000	533,000	'	'	'
Net loss attributable to the Partnership	-2,456,000	'	-2,731,000	'	-3,723,000	-28,396,000	'	'	'
Unrealized gain (loss) on post retirement benefit plan assets and liabilities	'	'	'	'	53,000	'	'	'	'
Other Comprehensive Income (Loss), Net of Tax	7,000	'	-34,000	'	53,000	-90,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-2,416,000	'	-2,575,000	'	-3,463,000	-27,953,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	-2,449,000	'	-2,765,000	'	-3,670,000	-28,486,000	'	'	'
Acquisition Costs, Period Cost	'	'	'	'	110,909,000	0	'	'	'
Additions to property, plant and equipment	'	'	'	'	41,257,000	22,842,000	'	'	'
Proceeds from disposals of property, plant and equipment	'	'	'	'	6,323,000	0	'	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	0	482,000	'	'	'
Proceeds from Contributions from Affiliates, Investing Activities	'	'	'	'	0	0	'	'	'
Payments of Distributions to Affiliates, Investing Activities	'	'	'	'	0	0	'	'	'
Net Cash Provided by (Used in) Investing Activities	'	'	'	'	-156,860,000	-22,360,000	'	'	'
Unitholder contributions	'	'	'	'	2,896,000	13,075,000	'	'	'
Proceeds from Contributions from Affiliates	'	'	'	'	0	0	'	'	'
Payments of Distributions to Affiliates	'	'	'	'	0	0	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	119,300,000	204,335,000	'	86,900,000	-204,335,000	0	'	'	'
Distribution Made to Limited Partner, Cash Distributions Paid	5,800,000	'	4,700,000	'	19,500,000	'	'	'	'
Unitholder distributions	'	'	'	'	19,549,000	12,458,000	'	'	'
Issuance of Series A convertible preferred units, net	'	'	'	'	0	14,393,000	'	'	'
Partners' Capital Account, Distributions	'	'	'	'	29,825,000	16,672,000	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	'	'	8,000	0	'	'	'
Net distributions to noncontrolling interest owners	'	'	'	'	0	0	'	'	'
LTIP tax netting unit repurchase	'	'	'	'	-253,000	-400,000	'	'	'
Payments of deferred debt issuance costs	'	'	'	'	3,380,000	1,509,000	'	'	'
Payments on other debt	'	'	'	'	2,217,000	2,231,000	'	'	'
Borrowings on other debt	'	'	'	'	170,000	1,495,000	'	'	'
Repayments of Related Party Debt	'	'	'	'	0	-1,072,000	'	'	'
Repayments of Other Debt	'	'	'	'	0	-6,200,000	'	'	'
Payments on long-term debt	'	'	'	'	212,670,000	99,821,000	'	'	'
Borrowings on long-term debt	'	'	'	'	139,635,000	92,571,000	'	'	'
Net Cash Provided by (Used in) Financing Activities	'	'	'	'	138,686,000	9,672,000	'	'	'
Net increase in cash and cash equivalents	'	'	'	'	66,000	2,899,000	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	9,925,000	2,912,000	'	'	'
In-kind unitholder distribution for Series B Units	'	'	'	'	1,671,000	0	'	'	'
Cash and cash equivalents, including discontinued operations	459,000	'	3,475,000	'	459,000	3,475,000	'	393,000	576,000
Interest payments, net	'	'	'	'	4,064,000	5,051,000	'	'	'
Capital Expenditures Incurred but Not yet Paid	'	'	'	'	-17,746,000	6,080,000	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	'	0	15,612,000	'	'	'
Noncontrolling Interest, Ownership Percentage by Parent	92.20%	'	'	'	92.20%	'	'	'	'
American Midstream Finance Corporation [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	'	'	'	'	100.00%	'	'	'	'
Parent Company [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Payments to Acquire Equity Method Investments	'	'	'	'	0	'	'	'	'
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	'	'	'	'	0	'	'	'	'
Investment in unconsolidated affiliate	0	'	'	'	0	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	'	'	'	0	0	'	'	'
Revenue, Net	0	'	0	'	0	0	'	'	'
Cash and Cash Equivalents, at Carrying Value	1,000	'	'	'	1,000	'	'	1,000	'
Accounts Receivable, Net, Current	0	'	'	'	0	'	'	0	'
Unbilled revenue	0	'	'	'	0	'	'	0	'
Derivative Assets, Current	0	'	'	'	0	'	'	0	'
Other Assets, Current	0	'	'	'	0	'	'	84,000	'
Current assets held for sale	0	'	'	'	0	'	'	0	'
Assets, Current	1,000	'	'	'	1,000	'	'	85,000	'
Derivative Assets, Noncurrent	'	'	'	'	'	'	'	0	'
Property, Plant and Equipment, Net	0	'	'	'	0	'	'	0	'
Notes Receivable, Related Parties, Noncurrent	27,315,000	'	'	'	27,315,000	'	'	27,315,000	'
Goodwill	0	'	'	'	0	'	'	0	'
Intangible assets, net	0	'	'	'	0	'	'	0	'
Other Assets, Noncurrent	0	'	'	'	0	'	'	0	'
Noncurrent assets held for sale, net	0	'	'	'	0	'	'	0	'
Investment In Subsidiaries	357,765,000	'	'	'	357,765,000	'	'	142,758,000	'
Assets	385,081,000	'	'	'	385,081,000	'	'	170,158,000	'
Accounts Payable, Current	59,000	'	'	'	59,000	'	'	30,000	'
Gas Purchase Payable, Current	0	'	'	'	0	'	'	0	'
Accrued Liabilities and Other Liabilities	0	'	'	'	0	'	'	1,478,000	'
Less: current portion	0	'	'	'	0	'	'	0	'
Risk management liabilities	0	'	'	'	0	'	'	0	'
Current liabilities held for sale	0	'	'	'	0	'	'	0	'
Liabilities, Current	59,000	'	'	'	59,000	'	'	1,508,000	'
Risk management liabilities	0	'	'	'	0	'	'	0	'
Asset Retirement Obligation	0	'	'	'	0	'	'	0	'
Other Liabilities, Noncurrent	0	'	'	'	0	'	'	0	'
Long-term Debt, Excluding Current Maturities	0	'	'	'	0	'	'	0	'
Deferred tax liability	0	'	'	'	0	'	'	0	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	'	'	'	0	'	'	0	'
Liabilities	59,000	'	'	'	59,000	'	'	1,508,000	'
Series A convertible preferred units (5,586 thousand and 5,279 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	104,736,000	'	'	'	104,736,000	'	'	94,811,000	'
Partners' Capital	280,286,000	'	'	'	280,286,000	'	'	73,839,000	'
Noncontrolling interests	0	'	'	'	0	'	'	0	'
Total liabilities and partners’ capital	280,286,000	'	'	'	280,286,000	'	'	73,839,000	'
Liabilities and Equity	385,081,000	'	'	'	385,081,000	'	'	170,158,000	'
(Loss) gain on commodity derivatives, net	0	'	0	'	0	0	'	'	'
Total Revenue	0	'	0	'	0	0	'	'	'
Purchases of natural gas, NGLs and condensate	0	'	0	'	0	0	'	'	'
Direct Operating Costs	0	'	0	'	0	0	'	'	'
Selling, General and Administrative Expense	0	'	0	'	0	0	'	'	'
Allocated Share-based Compensation Expense	0	'	0	'	0	0	'	'	'
Depreciation, amortization and accretion expense	0	'	0	'	0	0	'	'	'
Total operating expenses	0	'	0	'	0	0	'	'	'
Gain on involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Loss on sale of assets, net	0	'	'	'	0	'	'	'	'
Impairment of Long-Lived Assets Held-for-use	'	'	'	'	'	0	'	'	'
Operating income (loss)	0	'	0	'	0	0	'	'	'
Earnings from Consolidated Affiliates	-3,037,000	'	-2,731,000	'	-5,549,000	-28,396,000	'	'	'
Interest Income (Expense), Net	581,000	'	'	'	1,826,000	0	'	'	'
Interest Expense	'	'	0	'	'	'	'	'	'
Other Nonoperating Income (Expense)	0	'	'	'	0	'	'	'	'
Earnings in unconsolidated affiliate	0	'	'	'	0	'	'	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	-2,456,000	'	-2,731,000	'	-3,723,000	-28,396,000	'	'	'
Income tax (expense) benefit	0	'	0	'	0	0	'	'	'
Net loss from continuing operations	-2,456,000	'	-2,731,000	'	-3,723,000	-28,396,000	'	'	'
Loss from operations of disposal groups, net of tax	0	'	0	'	0	0	'	'	'
Net loss	-2,456,000	'	-2,731,000	'	-3,723,000	-28,396,000	'	'	'
Less: Comprehensive income attributable to noncontrolling interests	0	'	0	'	0	0	'	'	'
Net loss attributable to the Partnership	-2,456,000	'	-2,731,000	'	-3,723,000	-28,396,000	'	'	'
Unrealized gain (loss) on post retirement benefit plan assets and liabilities	7,000	'	-34,000	'	53,000	-90,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-2,449,000	'	-2,765,000	'	-3,670,000	-28,486,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	-2,449,000	'	-2,765,000	'	-3,670,000	-28,486,000	'	'	'
Acquisition Costs, Period Cost	'	'	'	'	0	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	0	0	'	'	'
Proceeds from disposals of property, plant and equipment	'	'	'	'	0	'	'	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Proceeds from Contributions from Affiliates, Investing Activities	'	'	'	'	19,549,000	12,458,000	'	'	'
Payments of Distributions to Affiliates, Investing Activities	'	'	'	'	-237,231,000	-27,468,000	'	'	'
Net Cash Provided by (Used in) Investing Activities	'	'	'	'	-217,682,000	-15,010,000	'	'	'
Unitholder contributions	'	'	'	'	2,896,000	13,075,000	'	'	'
Proceeds from Contributions from Affiliates	'	'	'	'	0	0	'	'	'
Payments of Distributions to Affiliates	'	'	'	'	0	0	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	-204,335,000	'	'	'	'
Distribution Made to Limited Partner, Cash Distributions Paid	'	'	'	'	19,549,000	12,458,000	'	'	'
Issuance of Series A convertible preferred units, net	'	'	'	'	'	14,393,000	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	'	'	0	'	'	'	'
Net distributions to noncontrolling interest owners	'	'	'	'	0	0	'	'	'
Partners' Capital Account, Treasury Units, Purchased	'	'	'	'	0	0	'	'	'
Payments of deferred debt issuance costs	'	'	'	'	0	0	'	'	'
Payments on other debt	'	'	'	'	0	0	'	'	'
Borrowings on other debt	'	'	'	'	0	0	'	'	'
Repayments of Related Party Debt	'	'	'	'	'	0	'	'	'
Repayments of Other Debt	'	'	'	'	'	0	'	'	'
Payments on long-term debt	'	'	'	'	0	0	'	'	'
Borrowings on long-term debt	'	'	'	'	0	0	'	'	'
Net Cash Provided by (Used in) Financing Activities	'	'	'	'	217,682,000	15,010,000	'	'	'
Net increase in cash and cash equivalents	'	'	'	'	0	0	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	9,925,000	2,912,000	'	'	'
In-kind unitholder distribution for Series B Units	'	'	'	'	1,671,000	'	'	'	'
Cash and cash equivalents, including discontinued operations	1,000	'	1,000	'	1,000	1,000	'	1,000	1,000
Interest payments, net	'	'	'	'	0	0	'	'	'
Capital Expenditures Incurred but Not yet Paid	'	'	'	'	0	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	'	'	15,612,000	'	'	'
Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Payments to Acquire Equity Method Investments	'	'	'	'	-12,000,000	'	'	'	'
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	'	'	'	'	983,000	'	'	'	'
Investment in unconsolidated affiliate	11,017,000	'	'	'	11,017,000	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	'	'	'	14,555,000	11,413,000	'	'	'
Revenue, Net	61,275,000	'	64,346,000	'	200,619,000	179,744,000	'	'	'
Cash and Cash Equivalents, at Carrying Value	458,000	'	'	'	458,000	'	'	392,000	'
Accounts Receivable, Net, Current	5,243,000	'	'	'	5,243,000	'	'	4,461,000	'
Unbilled revenue	17,747,000	'	'	'	17,747,000	'	'	18,321,000	'
Derivative Assets, Current	1,047,000	'	'	'	1,047,000	'	'	473,000	'
Other Assets, Current	4,323,000	'	'	'	4,323,000	'	'	6,942,000	'
Current assets held for sale	29,000	'	'	'	29,000	'	'	272,000	'
Assets, Current	28,847,000	'	'	'	28,847,000	'	'	30,861,000	'
Derivative Assets, Noncurrent	'	'	'	'	'	'	'	0	'
Property, Plant and Equipment, Net	358,413,000	'	'	'	358,413,000	'	'	254,656,000	'
Notes Receivable, Related Parties, Noncurrent	0	'	'	'	0	'	'	0	'
Goodwill	16,253,000	'	'	'	16,253,000	'	'	16,447,000	'
Intangible assets, net	45,585,000	'	'	'	45,585,000	'	'	3,682,000	'
Other Assets, Noncurrent	10,212,000	'	'	'	10,212,000	'	'	8,321,000	'
Noncurrent assets held for sale, net	1,164,000	'	'	'	1,164,000	'	'	1,723,000	'
Investment In Subsidiaries	56,969,000	'	'	'	56,969,000	'	'	57,750,000	'
Assets	528,460,000	'	'	'	528,460,000	'	'	373,440,000	'
Accounts Payable, Current	12,242,000	'	'	'	12,242,000	'	'	2,902,000	'
Gas Purchase Payable, Current	12,798,000	'	'	'	12,798,000	'	'	14,282,000	'
Accrued Liabilities and Other Liabilities	21,026,000	'	'	'	21,026,000	'	'	13,563,000	'
Less: current portion	1,000	'	'	'	1,000	'	'	2,048,000	'
Risk management liabilities	335,000	'	'	'	335,000	'	'	423,000	'
Current liabilities held for sale	1,000	'	'	'	1,000	'	'	114,000	'
Liabilities, Current	46,403,000	'	'	'	46,403,000	'	'	33,332,000	'
Risk management liabilities	0	'	'	'	0	'	'	101,000	'
Asset Retirement Obligation	34,300,000	'	'	'	34,300,000	'	'	34,164,000	'
Other Liabilities, Noncurrent	161,000	'	'	'	161,000	'	'	191,000	'
Long-term Debt, Excluding Current Maturities	85,015,000	'	'	'	85,015,000	'	'	158,050,000	'
Deferred tax liability	4,816,000	'	'	'	4,816,000	'	'	4,749,000	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	'	'	'	0	'	'	95,000	'
Liabilities	170,695,000	'	'	'	170,695,000	'	'	230,682,000	'
Series A convertible preferred units (5,586 thousand and 5,279 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	0	'	'	'	0	'	'	0	'
Partners' Capital	357,765,000	'	'	'	357,765,000	'	'	142,758,000	'
Noncontrolling interests	0	'	'	'	0	'	'	0	'
Total liabilities and partners’ capital	357,765,000	'	'	'	357,765,000	'	'	142,758,000	'
Liabilities and Equity	528,460,000	'	'	'	528,460,000	'	'	373,440,000	'
(Loss) gain on commodity derivatives, net	626,000	'	-499,000	'	392,000	110,000	'	'	'
Total Revenue	61,901,000	'	63,847,000	'	201,011,000	179,854,000	'	'	'
Purchases of natural gas, NGLs and condensate	40,473,000	'	45,153,000	'	135,487,000	134,368,000	'	'	'
Direct Operating Costs	10,732,000	'	7,886,000	'	28,395,000	18,961,000	'	'	'
Selling, General and Administrative Expense	5,875,000	'	4,494,000	'	17,105,000	12,507,000	'	'	'
Allocated Share-based Compensation Expense	337,000	'	392,000	'	1,132,000	1,877,000	'	'	'
Depreciation, amortization and accretion expense	5,277,000	'	7,465,000	'	18,076,000	21,031,000	'	'	'
Total operating expenses	62,694,000	'	65,390,000	'	200,195,000	188,744,000	'	'	'
Gain on involuntary conversion of property, plant and equipment	'	'	'	'	'	343,000	'	'	'
Loss on sale of assets, net	-103,000	'	'	'	-124,000	'	'	'	'
Impairment of Long-Lived Assets Held-for-use	'	'	'	'	'	-15,232,000	'	'	'
Operating income (loss)	-896,000	'	-1,543,000	'	692,000	-23,779,000	'	'	'
Earnings from Consolidated Affiliates	573,000	'	1,249,000	'	1,995,000	3,643,000	'	'	'
Interest Income (Expense), Net	-2,011,000	'	'	'	-6,839,000	-6,958,000	'	'	'
Interest Expense	'	'	2,636,000	'	'	'	'	'	'
Other Nonoperating Income (Expense)	-672,000	'	'	'	-672,000	'	'	'	'
Earnings in unconsolidated affiliate	117,000	'	'	'	117,000	'	'	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	-2,889,000	'	-2,930,000	'	-4,707,000	-27,094,000	'	'	'
Income tax (expense) benefit	122,000	'	214,000	'	260,000	-589,000	'	'	'
Net loss from continuing operations	-3,011,000	'	-2,716,000	'	-4,967,000	-26,505,000	'	'	'
Loss from operations of disposal groups, net of tax	-26,000	'	-15,000	'	-582,000	-1,891,000	'	'	'
Net loss	-3,037,000	'	-2,731,000	'	-5,549,000	-28,396,000	'	'	'
Less: Comprehensive income attributable to noncontrolling interests	0	'	0	'	0	0	'	'	'
Net loss attributable to the Partnership	-3,037,000	'	-2,731,000	'	-5,549,000	-28,396,000	'	'	'
Unrealized gain (loss) on post retirement benefit plan assets and liabilities	7,000	'	-34,000	'	53,000	-90,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-3,030,000	'	-2,765,000	'	-5,496,000	-28,486,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	-3,030,000	'	-2,765,000	'	-5,496,000	-28,486,000	'	'	'
Acquisition Costs, Period Cost	'	'	'	'	-110,909,000	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	40,653,000	22,841,000	'	'	'
Proceeds from disposals of property, plant and equipment	'	'	'	'	6,323,000	'	'	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	'	482,000	'	'	'
Proceeds from Contributions from Affiliates, Investing Activities	'	'	'	'	0	0	'	'	'
Payments of Distributions to Affiliates, Investing Activities	'	'	'	'	0	0	'	'	'
Net Cash Provided by (Used in) Investing Activities	'	'	'	'	-156,256,000	-22,359,000	'	'	'
Unitholder contributions	'	'	'	'	0	0	'	'	'
Proceeds from Contributions from Affiliates	'	'	'	'	237,231,000	27,468,000	'	'	'
Payments of Distributions to Affiliates	'	'	'	'	16,741,000	8,856,000	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	0	'	'	'	'
Distribution Made to Limited Partner, Cash Distributions Paid	'	'	'	'	0	0	'	'	'
Issuance of Series A convertible preferred units, net	'	'	'	'	'	0	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	'	'	-8,000	'	'	'	'
Net distributions to noncontrolling interest owners	'	'	'	'	0	0	'	'	'
Partners' Capital Account, Treasury Units, Purchased	'	'	'	'	-253,000	-400,000	'	'	'
Payments of deferred debt issuance costs	'	'	'	'	3,380,000	1,509,000	'	'	'
Payments on other debt	'	'	'	'	2,217,000	2,231,000	'	'	'
Borrowings on other debt	'	'	'	'	170,000	1,495,000	'	'	'
Repayments of Related Party Debt	'	'	'	'	'	-1,072,000	'	'	'
Repayments of Other Debt	'	'	'	'	'	6,200,000	'	'	'
Payments on long-term debt	'	'	'	'	212,670,000	99,821,000	'	'	'
Borrowings on long-term debt	'	'	'	'	139,635,000	92,571,000	'	'	'
Net Cash Provided by (Used in) Financing Activities	'	'	'	'	141,767,000	13,845,000	'	'	'
Net increase in cash and cash equivalents	'	'	'	'	66,000	2,899,000	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	0	0	'	'	'
In-kind unitholder distribution for Series B Units	'	'	'	'	0	'	'	'	'
Cash and cash equivalents, including discontinued operations	458,000	'	3,474,000	'	458,000	3,474,000	'	392,000	575,000
Interest payments, net	'	'	'	'	4,064,000	5,051,000	'	'	'
Capital Expenditures Incurred but Not yet Paid	'	'	'	'	17,746,000	6,080,000	'	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	'	'	'	'	'	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	'	'	0	'	'	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Payments to Acquire Equity Method Investments	'	'	'	'	0	'	'	'	'
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	'	'	'	'	0	'	'	'	'
Investment in unconsolidated affiliate	0	'	'	'	0	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	'	'	'	3,685,000	4,174,000	'	'	'
Revenue, Net	12,532,000	'	14,562,000	'	36,591,000	41,818,000	'	'	'
Cash and Cash Equivalents, at Carrying Value	0	'	'	'	0	'	'	0	'
Accounts Receivable, Net, Current	2,187,000	'	'	'	2,187,000	'	'	2,361,000	'
Unbilled revenue	3,524,000	'	'	'	3,524,000	'	'	4,680,000	'
Derivative Assets, Current	0	'	'	'	0	'	'	0	'
Other Assets, Current	392,000	'	'	'	392,000	'	'	555,000	'
Current assets held for sale	0	'	'	'	0	'	'	0	'
Assets, Current	6,103,000	'	'	'	6,103,000	'	'	7,596,000	'
Derivative Assets, Noncurrent	'	'	'	'	'	'	'	0	'
Property, Plant and Equipment, Net	57,386,000	'	'	'	57,386,000	'	'	58,045,000	'
Notes Receivable, Related Parties, Noncurrent	0	'	'	'	0	'	'	0	'
Goodwill	0	'	'	'	0	'	'	0	'
Intangible assets, net	0	'	'	'	0	'	'	0	'
Other Assets, Noncurrent	983,000	'	'	'	983,000	'	'	743,000	'
Noncurrent assets held for sale, net	0	'	'	'	0	'	'	0	'
Investment In Subsidiaries	0	'	'	'	0	'	'	0	'
Assets	64,472,000	'	'	'	64,472,000	'	'	66,384,000	'
Accounts Payable, Current	125,000	'	'	'	125,000	'	'	329,000	'
Gas Purchase Payable, Current	1,964,000	'	'	'	1,964,000	'	'	3,104,000	'
Accrued Liabilities and Other Liabilities	399,000	'	'	'	399,000	'	'	101,000	'
Less: current portion	0	'	'	'	0	'	'	0	'
Risk management liabilities	0	'	'	'	0	'	'	0	'
Current liabilities held for sale	0	'	'	'	0	'	'	0	'
Liabilities, Current	2,488,000	'	'	'	2,488,000	'	'	3,534,000	'
Risk management liabilities	0	'	'	'	0	'	'	0	'
Asset Retirement Obligation	482,000	'	'	'	482,000	'	'	472,000	'
Other Liabilities, Noncurrent	0	'	'	'	0	'	'	0	'
Long-term Debt, Excluding Current Maturities	0	'	'	'	0	'	'	0	'
Deferred tax liability	0	'	'	'	0	'	'	0	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	'	'	'	0	'	'	0	'
Liabilities	2,970,000	'	'	'	2,970,000	'	'	4,006,000	'
Series A convertible preferred units (5,586 thousand and 5,279 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	0	'	'	'	0	'	'	0	'
Partners' Capital	56,969,000	'	'	'	56,969,000	'	'	57,750,000	'
Noncontrolling interests	4,533,000	'	'	'	4,533,000	'	'	4,628,000	'
Total liabilities and partners’ capital	61,502,000	'	'	'	61,502,000	'	'	62,378,000	'
Liabilities and Equity	64,472,000	'	'	'	64,472,000	'	'	66,384,000	'
(Loss) gain on commodity derivatives, net	-20,000	'	0	'	-109,000	0	'	'	'
Total Revenue	12,512,000	'	14,562,000	'	36,482,000	41,818,000	'	'	'
Purchases of natural gas, NGLs and condensate	10,325,000	'	11,502,000	'	29,512,000	32,991,000	'	'	'
Direct Operating Costs	1,152,000	'	1,206,000	'	3,494,000	3,408,000	'	'	'
Selling, General and Administrative Expense	0	'	0	'	0	0	'	'	'
Allocated Share-based Compensation Expense	0	'	0	'	0	0	'	'	'
Depreciation, amortization and accretion expense	429,000	'	415,000	'	1,274,000	1,243,000	'	'	'
Total operating expenses	11,906,000	'	13,123,000	'	34,280,000	37,642,000	'	'	'
Gain on involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Loss on sale of assets, net	0	'	'	'	0	'	'	'	'
Impairment of Long-Lived Assets Held-for-use	'	'	'	'	'	0	'	'	'
Operating income (loss)	606,000	'	1,439,000	'	2,202,000	4,176,000	'	'	'
Earnings from Consolidated Affiliates	0	'	0	'	0	0	'	'	'
Interest Income (Expense), Net	0	'	'	'	'	'	'	'	'
Interest Expense	'	'	0	'	0	0	'	'	'
Other Nonoperating Income (Expense)	0	'	'	'	0	'	'	'	'
Earnings in unconsolidated affiliate	0	'	'	'	0	'	'	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	606,000	'	1,439,000	'	2,202,000	4,176,000	'	'	'
Income tax (expense) benefit	0	'	0	'	0	0	'	'	'
Net loss from continuing operations	606,000	'	1,439,000	'	2,202,000	4,176,000	'	'	'
Loss from operations of disposal groups, net of tax	0	'	0	'	0	0	'	'	'
Net loss	606,000	'	1,439,000	'	2,202,000	4,176,000	'	'	'
Less: Comprehensive income attributable to noncontrolling interests	33,000	'	190,000	'	207,000	533,000	'	'	'
Net loss attributable to the Partnership	573,000	'	1,249,000	'	1,995,000	3,643,000	'	'	'
Unrealized gain (loss) on post retirement benefit plan assets and liabilities	0	'	0	'	0	0	'	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	606,000	'	1,439,000	'	2,202,000	4,176,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	573,000	'	1,249,000	'	1,995,000	3,643,000	'	'	'
Acquisition Costs, Period Cost	'	'	'	'	0	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	-604,000	1,000	'	'	'
Proceeds from disposals of property, plant and equipment	'	'	'	'	0	'	'	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Proceeds from Contributions from Affiliates, Investing Activities	'	'	'	'	0	0	'	'	'
Payments of Distributions to Affiliates, Investing Activities	'	'	'	'	0	0	'	'	'
Net Cash Provided by (Used in) Investing Activities	'	'	'	'	-604,000	-1,000	'	'	'
Unitholder contributions	'	'	'	'	0	0	'	'	'
Proceeds from Contributions from Affiliates	'	'	'	'	0	0	'	'	'
Payments of Distributions to Affiliates	'	'	'	'	2,808,000	3,602,000	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	0	'	'	'	'
Distribution Made to Limited Partner, Cash Distributions Paid	'	'	'	'	0	0	'	'	'
Issuance of Series A convertible preferred units, net	'	'	'	'	'	0	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	'	'	0	'	'	'	'
Net distributions to noncontrolling interest owners	'	'	'	'	273,000	571,000	'	'	'
Partners' Capital Account, Treasury Units, Purchased	'	'	'	'	0	0	'	'	'
Payments of deferred debt issuance costs	'	'	'	'	0	0	'	'	'
Payments on other debt	'	'	'	'	0	0	'	'	'
Borrowings on other debt	'	'	'	'	0	0	'	'	'
Repayments of Related Party Debt	'	'	'	'	'	0	'	'	'
Repayments of Other Debt	'	'	'	'	'	0	'	'	'
Payments on long-term debt	'	'	'	'	0	0	'	'	'
Borrowings on long-term debt	'	'	'	'	0	0	'	'	'
Net Cash Provided by (Used in) Financing Activities	'	'	'	'	-3,081,000	-4,173,000	'	'	'
Net increase in cash and cash equivalents	'	'	'	'	0	0	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	0	0	'	'	'
In-kind unitholder distribution for Series B Units	'	'	'	'	0	'	'	'	'
Cash and cash equivalents, including discontinued operations	0	'	0	'	0	0	'	0	0
Interest payments, net	'	'	'	'	0	0	'	'	'
Capital Expenditures Incurred but Not yet Paid	'	'	'	'	0	0	'	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	'	'	'	'	'	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	'	'	0	'	'	'
Consolidation, Eliminations [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Payments to Acquire Equity Method Investments	'	'	'	'	0	'	'	'	'
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	'	'	'	'	0	'	'	'	'
Investment in unconsolidated affiliate	0	'	'	'	0	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	'	'	'	0	0	'	'	'
Revenue, Net	-4,108,000	'	-890,000	'	-9,270,000	-4,361,000	'	'	'
Cash and Cash Equivalents, at Carrying Value	0	'	'	'	0	'	'	0	'
Accounts Receivable, Net, Current	0	'	'	'	0	'	'	0	'
Unbilled revenue	0	'	'	'	0	'	'	0	'
Derivative Assets, Current	0	'	'	'	0	'	'	0	'
Other Assets, Current	0	'	'	'	0	'	'	-84,000	'
Current assets held for sale	0	'	'	'	0	'	'	0	'
Assets, Current	0	'	'	'	0	'	'	-84,000	'
Derivative Assets, Noncurrent	'	'	'	'	'	'	'	0	'
Property, Plant and Equipment, Net	0	'	'	'	0	'	'	0	'
Notes Receivable, Related Parties, Noncurrent	-27,315,000	'	'	'	-27,315,000	'	'	-27,315,000	'
Goodwill	0	'	'	'	0	'	'	0	'
Intangible assets, net	0	'	'	'	0	'	'	0	'
Other Assets, Noncurrent	0	'	'	'	0	'	'	0	'
Noncurrent assets held for sale, net	0	'	'	'	0	'	'	0	'
Investment In Subsidiaries	-414,734,000	'	'	'	-414,734,000	'	'	-200,508,000	'
Assets	-442,049,000	'	'	'	-442,049,000	'	'	-227,907,000	'
Accounts Payable, Current	0	'	'	'	0	'	'	0	'
Gas Purchase Payable, Current	0	'	'	'	0	'	'	0	'
Accrued Liabilities and Other Liabilities	0	'	'	'	0	'	'	-84,000	'
Less: current portion	0	'	'	'	0	'	'	0	'
Risk management liabilities	0	'	'	'	0	'	'	0	'
Current liabilities held for sale	0	'	'	'	0	'	'	0	'
Liabilities, Current	0	'	'	'	0	'	'	-84,000	'
Risk management liabilities	0	'	'	'	0	'	'	0	'
Asset Retirement Obligation	0	'	'	'	0	'	'	0	'
Other Liabilities, Noncurrent	0	'	'	'	0	'	'	0	'
Long-term Debt, Excluding Current Maturities	-27,315,000	'	'	'	-27,315,000	'	'	-27,315,000	'
Deferred tax liability	0	'	'	'	0	'	'	0	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	'	'	'	0	'	'	0	'
Liabilities	-27,315,000	'	'	'	-27,315,000	'	'	-27,399,000	'
Series A convertible preferred units (5,586 thousand and 5,279 thousand units issued and outstanding as of September 30, 2014, and December 31, 2013, respectively)	0	'	'	'	0	'	'	0	'
Partners' Capital	-414,734,000	'	'	'	-414,734,000	'	'	-200,508,000	'
Noncontrolling interests	0	'	'	'	0	'	'	0	'
Total liabilities and partners’ capital	-414,734,000	'	'	'	-414,734,000	'	'	-200,508,000	'
Liabilities and Equity	-442,049,000	'	'	'	-442,049,000	'	'	-227,907,000	'
(Loss) gain on commodity derivatives, net	0	'	0	'	0	0	'	'	'
Total Revenue	-4,108,000	'	-890,000	'	-9,270,000	-4,361,000	'	'	'
Purchases of natural gas, NGLs and condensate	-4,108,000	'	-890,000	'	-9,270,000	-4,361,000	'	'	'
Direct Operating Costs	0	'	0	'	0	0	'	'	'
Selling, General and Administrative Expense	0	'	0	'	0	0	'	'	'
Allocated Share-based Compensation Expense	0	'	0	'	0	0	'	'	'
Depreciation, amortization and accretion expense	0	'	0	'	0	0	'	'	'
Total operating expenses	-4,108,000	'	-890,000	'	-9,270,000	-4,361,000	'	'	'
Gain on involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Loss on sale of assets, net	0	'	'	'	0	'	'	'	'
Impairment of Long-Lived Assets Held-for-use	'	'	'	'	'	0	'	'	'
Operating income (loss)	0	'	0	'	0	0	'	'	'
Earnings from Consolidated Affiliates	2,464,000	'	1,482,000	'	3,554,000	24,753,000	'	'	'
Interest Income (Expense), Net	0	'	'	'	'	'	'	'	'
Interest Expense	'	'	0	'	0	0	'	'	'
Other Nonoperating Income (Expense)	0	'	'	'	0	'	'	'	'
Earnings in unconsolidated affiliate	0	'	'	'	0	'	'	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	2,464,000	'	1,482,000	'	3,554,000	24,753,000	'	'	'
Income tax (expense) benefit	0	'	0	'	0	0	'	'	'
Net loss from continuing operations	2,464,000	'	1,482,000	'	3,554,000	24,753,000	'	'	'
Loss from operations of disposal groups, net of tax	0	'	0	'	0	0	'	'	'
Net loss	2,464,000	'	1,482,000	'	3,554,000	24,753,000	'	'	'
Less: Comprehensive income attributable to noncontrolling interests	0	'	0	'	0	0	'	'	'
Net loss attributable to the Partnership	2,464,000	'	1,482,000	'	3,554,000	24,753,000	'	'	'
Unrealized gain (loss) on post retirement benefit plan assets and liabilities	-7,000	'	34,000	'	-53,000	90,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,457,000	'	1,516,000	'	3,501,000	24,843,000	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	2,457,000	'	1,516,000	'	3,501,000	24,843,000	'	'	'
Acquisition Costs, Period Cost	'	'	'	'	0	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	0	0	'	'	'
Proceeds from disposals of property, plant and equipment	'	'	'	'	0	'	'	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Proceeds from Contributions from Affiliates, Investing Activities	'	'	'	'	-19,549,000	-12,458,000	'	'	'
Payments of Distributions to Affiliates, Investing Activities	'	'	'	'	237,231,000	27,468,000	'	'	'
Net Cash Provided by (Used in) Investing Activities	'	'	'	'	217,682,000	15,010,000	'	'	'
Unitholder contributions	'	'	'	'	0	0	'	'	'
Proceeds from Contributions from Affiliates	'	'	'	'	-237,231,000	-27,468,000	'	'	'
Payments of Distributions to Affiliates	'	'	'	'	-19,549,000	-12,458,000	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	0	'	'	'	'
Distribution Made to Limited Partner, Cash Distributions Paid	'	'	'	'	0	0	'	'	'
Issuance of Series A convertible preferred units, net	'	'	'	'	'	0	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	'	'	0	'	'	'	'
Net distributions to noncontrolling interest owners	'	'	'	'	0	0	'	'	'
Partners' Capital Account, Treasury Units, Purchased	'	'	'	'	0	0	'	'	'
Payments of deferred debt issuance costs	'	'	'	'	0	0	'	'	'
Payments on other debt	'	'	'	'	0	0	'	'	'
Borrowings on other debt	'	'	'	'	0	0	'	'	'
Repayments of Related Party Debt	'	'	'	'	'	0	'	'	'
Repayments of Other Debt	'	'	'	'	'	0	'	'	'
Payments on long-term debt	'	'	'	'	0	0	'	'	'
Borrowings on long-term debt	'	'	'	'	0	0	'	'	'
Net Cash Provided by (Used in) Financing Activities	'	'	'	'	-217,682,000	-15,010,000	'	'	'
Net increase in cash and cash equivalents	'	'	'	'	0	0	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	0	0	'	'	'
In-kind unitholder distribution for Series B Units	'	'	'	'	0	'	'	'	'
Cash and cash equivalents, including discontinued operations	0	'	0	'	0	0	'	0	0
Interest payments, net	'	'	'	'	0	0	'	'	'
Capital Expenditures Incurred but Not yet Paid	'	'	'	'	0	0	'	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	'	'	'	'	'	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	'	'	0	'	'	'
ArcLight [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	'	'	'	'	0	59,994,000	'	'	'
Blackwater [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	'	'	'	'	0	22,129,000	'	'	'
Series B [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	-30,000,000	0	'	'	'
Partners' Capital Account, Distributions	619,000	'	0	'	1,671,000	0	'	'	'
Series B [Member] | Parent Company [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	-30,000,000	'	'	'	'
Series B [Member] | Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	0	'	'	'	'
Series B [Member] | Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	0	'	'	'	'
Series B [Member] | Consolidation, Eliminations [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	0	'	'	'	'
ArcLight [Member] | Parent Company [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	'	'	'	'	'	59,994,000	'	'	'
Blackwater [Member] | Parent Company [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	'	'	'	'	'	22,129,000	'	'	'
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Partners' Capital	157,000	'	261,000	'	157,000	261,000	'	104,000	351,000
Net loss	'	'	'	'	0	0	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	0	'	'	'	'
Partners' Capital Account, Distributions	'	'	'	'	0	0	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	'	'	0	'	'	'	'
Net distributions to noncontrolling interest owners	'	'	'	'	0	0	'	'	'
LTIP tax netting unit repurchase	'	'	'	'	0	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	'	'	0	'	'	'
Noncontrolling Interest [Member]	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'
Partners' Capital	4,533,000	'	7,400,000	'	4,533,000	7,400,000	'	4,628,000	7,438,000
Other Comprehensive Income (Loss), Net of Tax	'	'	'	'	0	0	'	'	'
Partners' Capital Account, Public Sale of Units Net of Offering Costs	'	'	'	'	0	'	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	'	'	'	-29,000	'	'	'	'
Net distributions to noncontrolling interest owners	'	'	'	'	273,000	571,000	'	'	'
LTIP tax netting unit repurchase	'	'	'	'	0	0	'	'	'
Fair value of Series A Units in excess of net assets received	'	'	'	'	'	$0	'	'	'

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	3 Months Ended			9 Months Ended				0 Months Ended		3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Aug. 20, 2014	Jan. 29, 2014	Oct. 24, 2014	Oct. 14, 2014	Sep. 30, 2014
								Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'
Payments to Acquire Equity Method Investments	'	'	'	$12,000,000	$0	'	'	'	'	'
Limited Partners' Capital Account, Units Issued	'	'	'	'	'	4,622,352	3,400,000	'	'	'
Sale of Stock, Price Per Share	'	'	'	'	'	$25.81	$26.75	'	'	'
Distribution declared per common unit (a)	$0.46	$0.46	$0.43	$1.38	$0.87	'	'	$1.89	'	$0.47
Business Combination, Consideration Transferred	'	'	'	'	'	'	'	'	471,500,000	'
Business Combination, Consideration Transferred, Other	'	'	'	'	'	'	'	'	6,892,931	'
Fair value, paid in kind distributions	$4,200,000	'	'	'	'	'	'	'	'	'
Proceeds from Lines of Credit	'	'	'	'	'	'	'	'	$271,600,000	'