Third Coast Midstream (AMID) 8-K 22 Jan 14 2013 Q3 Other Events Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013
Document and Entity Information [Abstract]	'
Entity Registrant Name	'American Midstream Partners, LP
Entity Central Index Key	'0001513965
Document Type	'8-K
Document Period End Date	30-Sep-13
Amendment Flag	'false
Document Fiscal Year Focus	'2013
Document Fiscal Period Focus	'Q3
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Non-accelerated Filer

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$3,473	$576
Accounts receivable	5,646	1,958
Unbilled revenue	23,756	21,512
Risk management assets	1,050	969
Other current assets	5,226	3,226
Assets Held-for-sale, Current	1,276	0
Total current assets	40,427	28,241
Property, plant and equipment, net	316,655	223,819
Noncurrent assets held for sale, net	3,016	0
Intangible Assets, Net (Excluding Goodwill)	4,351	0
Goodwill	16,447	0
Deferred Tax Assets, Gross	5,741	0
Other assets, net	6,202	4,636
Total assets	392,839	256,696
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	986	0
Current liabilities	'	'
Accounts payable	2,248	5,527
Accrued gas purchases	16,320	17,034
Accrued expenses and other current liabilities	17,548	9,619
Current portion of long-term debt	7,281	0
Due to Affiliate	20,000	0
Risk management liabilities	349	0
Liabilities of Disposal Group, Including Discontinued Operation, Current	1,355	0
Total current liabilities	65,101	32,180
Risk management liabilities	122	0
Asset Retirement Obligation	34,440	8,319
Other liabilities	215	309
Long- term debt	124,888	128,285
Total liabilities	236,512	169,093
Commitments and contingencies	'	'
Series A convertible preferred units (5,204 thousand units issued and outstanding as of September 30, 2013)	92,912	0
Partners' capital	'	'
General partner interest (185 thousand units issued and outstanding as of September 30, 2013 and December 31, 2012)	34,152	548
Limited partner interest (4,705 and 9,165 thousand units issued and outstanding as of September 30, 2013 and December 31, 2012, respectively)	21,602	79,266
Accumulated other comprehensive income	261	351
Total partners’ capital	56,015	80,165
Deferred Tax Liabilities, Gross	10,760	0
Noncontrolling interests	7,400	7,438
Total equity and partners' capital	63,415	87,603
Total liabilities, equity and partners' capital	$392,839	$256,696

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited)	Sep. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]	'	'
Series A convertible preferred, units issued	5,143,000	0
Series A convertible preferred, units outstanding	5,143,000	0
General partner interest, units issued	185,000	185,000
General partner interest units outstanding	185,000	185,000
Limited partners, units issued	9,209,000	9,165,000
Limited partner common units outstanding	9,209,000	9,165,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
Share data in Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'
Revenue	$80,035,000	$54,347,000	$216,516,000	$138,423,000
(Loss) gain on commodity derivatives, net	-499,000	-946,000	110,000	3,157,000
Total revenue	79,536,000	53,401,000	216,626,000	141,580,000
Operating expenses:	'	'	'	'
Purchases of natural gas, NGLs and condensate	57,973,000	41,365,000	162,671,000	100,075,000
Direct operating expenses	8,344,000	5,329,000	20,898,000	11,550,000
Selling, general and administrative expenses	5,157,000	3,246,000	13,748,000	10,101,000
Equity compensation expense	392,000	474,000	1,877,000	1,272,000
Depreciation, Depletion and Amortization	7,880,000	5,504,000	22,271,000	15,722,000
Depreciation and accretion expense	6,500,000	'	18,900,000	'
Total operating expenses	79,746,000	55,918,000	221,465,000	138,720,000
Gain on involuntary conversion of property, plant and equipment	0	0	343,000	0
Gain on sale of assets, net	0	4,000	0	121,000
Loss on impairment of property, plant and equipment	0	0	-15,232,000	0
Operating (loss) income	-210,000	-2,513,000	-19,728,000	2,981,000
Interest expense	-2,636,000	-1,501,000	-6,958,000	-3,083,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	-2,846,000	-4,014,000	-26,686,000	-102,000
Income Tax Expense (Benefit), Continuing Operations	214,000	'	589,000	'
Income Tax Expense (Benefit)	247,000	0	662,000	0
Net loss before income tax benefit	-2,632,000	-4,014,000	-26,097,000	-102,000
Income (loss) from operations of disposal groups	91,000	-12,000	-1,766,000	94,000
Net loss	-2,541,000	-4,026,000	-27,863,000	-8,000
Less: Comprehensive income attributable to noncontrolling interests	190,000	249,000	533,000	249,000
Other income (expenses):	'	'	'	'
Net loss attributable to the Partnership	-2,731,000	-4,275,000	-28,396,000	-257,000
General partner's interest in net loss	-221,000	-85,000	'	-5,000
Limited partners' interest in net loss	($2,510,000)	($4,190,000)	($27,202,000)	($252,000)
Limited partners’ net (loss) income from continuing operations per unit (basic)	-0.82	-0.46	-5.54	-0.04
Limited partners’ net (loss) income per unit (basic)	-0.8	-0.46	-5.73	-0.03
Income (loss) from discontinued operations	6,663	9,108	8,334	9,103

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Other Comprehensive Income [Abstract]	'	'	'	'
Net loss	($2,541)	($4,026)	($27,863)	($8)
Unrealized (loss) gain on post retirement benefit plan assets and liabilities	-34	23	-90	40
Comprehensive (loss) income	-2,575	-4,003	-27,953	32
Less: Comprehensive income attributable to noncontrolling interests	190	249	533	249
Comprehensive loss attributable to Partnership	($2,765)	($4,252)	($28,486)	($217)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Changes in Partners' Capital (Unaudited) (USD $)	Total	Limited Partner Interest	General Partner [Member]	Accumulated Other Comprehensive Income	Total Partners' Capital	Non-controlling Interest
In Thousands
Beginning Balance at Dec. 31, 2011	'	$99,890	$1,091	$415	$101,396	$0
Noncontrolling Interest, Increase from Business Combination	'	0	0	0	0	7,407
Net loss	-8	-252	-5	0	-257	249
Unitholder contributions	'	0	13	0	13	0
Unit holder distributions	'	-11,809	-241	0	-12,050	0
Fair value of Series A Units in excess of net assets received	0	'	'	'	'	'
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	249	0	0	0	0	-249
LTIP vesting	'	364	-364	0	0	0
Tax netting repurchase	'	-88	0	0	-88	0
Unit based compensation	'	97	1,175	0	1,272	0
Other comprehensive income (loss)	'	0	0	40	40	0
Ending Balance at Sep. 30, 2012	'	88,202	1,669	455	90,326	7,407
Beginning Balance at Dec. 31, 2012	80,165	79,266	548	351	80,165	7,438
Net loss	-27,863	-27,202	-1,194	0	-28,396	533
Unitholder contributions	'	0	35,196	0	35,196	0
Unit holder distributions	-240	-16,332	-340	0	-16,672	0
Fair value of Series A Units in excess of net assets received	-15,612	-15,300	-312	0	-15,612	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	571	0	0	0	0	-571
LTIP vesting	'	1,570	-1,570	0	0	0
Tax netting repurchase	'	-400	0	0	-400	0
Unit based compensation	'	0	1,824	0	1,824	0
Other comprehensive income (loss)	'	0	0	-90	-90	0
Ending Balance at Sep. 30, 2013	$56,015	$21,602	$34,152	$261	$56,015	$7,400

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]	'	'
Cash and cash equivalents, including discontinued operations	$3,475	'
Net loss	-27,863	-8
Depreciation and Accretion Expense, Including Discontinued Operation	22,355	15,819
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Amortization of deferred financing costs	975	493
Amortization of weather derivative premium	378	0
Unrealized loss (gain) on commodity derivatives	1,159	-1,733
Unit based compensation	1,824	1,272
OPEB plan net periodic benefit	-55	-61
Gain on involuntary conversion of property, plant and equipment	-343	0
(Gain) loss on sale of assets	0	-121
Gain (loss) on sale of assets, net, including discontinued operations	'	126
Loss on impairment of property, plant and equipment	15,232	0
Loss on impairment of noncurrent assets held for sale	1,807	0
Deferred Income Tax Expense (Benefit)	-662	0
Changes in operating assets and liabilities, net:	'	'
Accounts receivable	397	-558
Unbilled Revenue	-1,970	6,677
Risk management assets	-1,147	0
Other current assets	602	1,285
Other assets, net	-67	-65
Accounts payable	121	1,396
Accrued gas purchases	273	-5,833
Accrued expenses and other current liabilities	2,685	-1,879
Other liabilities	-114	-203
Net cash provided by operating activities	15,587	16,476
Acquisition Costs, Period Cost	0	-51,377
Cash flows from investing activities	'	'
Additions to property, plant and equipment	-22,842	-4,465
Proceeds from disposals of property, plant and equipment	0	126
Insurance proceeds from involuntary conversion of property, plant and equipment	482	0
Net cash provided (used) in investing activities	-22,360	-55,716
Cash flows from financing activities	'	'
Unit holder contributions	13,075	13
Unit holder distributions	-12,458	-12,050
Issuance of Series A convertible preferred units, net	14,393	0
Net distributions to non-controlling interest owners	-571	-249
LTIP tax netting unit repurchase	-400	-88
Payments for deferred debt issuance costs	-1,509	-1,140
Payments on other debt	-2,231	0
Borrowings on other debt	1,495	0
Repayments of Other Debt	-1,072	0
Proceeds from Other Debt	6,200	0
Payments on long-term debt	-99,821	-42,310
Borrowings on long-term debt	92,571	94,690
Net cash provided by financing activities	9,672	38,866
Net increase (decrease) in cash and cash equivalents	2,899	-374
Cash and cash equivalents	'	'
Beginning of period	576	871
End of period	3,473	497
Supplemental cash flow information	'	'
Interest payments	5,051	1,894
Supplemental non-cash information	'	'
(Decrease) increase in accrued property, plant and equipment	-6,080	808
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	59,995	0
Fair value of Series A Units in excess of value of contributed High Point System	15,612	0
Accrued and in-kind unitholder distribution for Series A Units	2,912	0
Terminals [Member]	'	'
Supplemental non-cash information	'	'
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	$22,129	$0

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2013
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 acquiring and operating certain natural gas pipeline and processing businesses. 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 eleven gathering systems, four processing facilities, three interstate pipelines and five intrastate pipelines. We also own a 50% undivided, non-operating interest in a processing plant located in southern Louisiana. We hold our assets in a series of wholly owned limited liability companies as well as a limited partnership. Our capital accounts consist of general partner interests and limited partner interests.
	Our interstate and intrastate natural gas pipeline assets transport natural gas through the FERC regulated natural gas pipelines in Louisiana, Mississippi, Alabama and Tennessee. Our interstate and intrastate 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; and
	•	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.
	ArcLight Transactions
	On April 15, 2013, the Partnership, American Midstream GP, LLC, (our "General Partner") and AIM Midstream Holdings, LLC ("AIM"), an affiliate of American Infrastructure MLP Fund, entered into agreements (the "ArcLight Transactions") with High Point Infrastructure Partners, LLC ("HPIP"), an affiliate of ArcLight Capital Partners, LLC, pursuant to which HPIP (i) acquired 90% of our General Partner and all of our subordinated units from AIM and (ii) contributed certain midstream assets and $15.0 million in cash to us in exchange for 5,142,857 newly issued convertible preferred units (the “Series A Units”) issued by the Partnership. Of the $15.0 million cash consideration paid by HPIP, approximately $2.5 million was used to pay certain transaction expenses of HPIP, and the remaining approximately $12.5 million was used to repay borrowings outstanding under the Partnership's credit facility in connection with the Fourth Amendment to our credit agreement ("Fourth Amendment"). As a result of these transactions, which were also consummated on April 15, 2013, HPIP acquired both control of our General Partner and a majority of our outstanding limited partner interests. The midstream assets contributed by HPIP consist of approximately 700 miles of natural gas and liquids pipeline assets located in southeast Louisiana and the shallow water and deep shelf Gulf of Mexico (commonly referred to as the "High Point System"). The High Point System gathers natural gas from both onshore and offshore producing regions around southeast Louisiana. The onshore footprint is in Plaquemines and St. Bernard's Parishes, LA. The offshore footprint consists of the following federal Gulf of Mexico zones: Mississippi Canyon, Viosca Knoll, West Delta, Main Pass, South Pass and Breton Sound. Natural gas is collected at more than 75 receipt points that connect to hundreds of wells targeting various geological zones in water depths up to 1,000 feet, with an emphasis on oil and liquids-rich reservoirs. The High Point System is comprised of FERC-regulated transmission assets and non-jurisdictional assets, both of which accept natural gas from well production and interconnected pipeline systems. Natural gas is delivered to the Toca Gas Processing Plant, operated by Enterprise, where the products are processed and the residue gas sent to an unaffiliated interstate system owned by Kinder Morgan. See Note 3 "Acquisitions" for further information.
	The Partnership believes that the consummation of the ArcLight Transactions will allow it to comply with the Consolidated Total Leverage to EBITDA ratio in the Fourth Amendment. However, while we were in compliance with financial covenants of the Fourth Amendment as of September 30, 2013, no assurances can be given that the Partnership's future results of operations will allow us to comply with financial covenants of the Fourth Amendment. If we are not able to generate sufficient cash flows from operations to comply with the financial covenants in the Fourth Amendment and we are not able to enter into an agreement to refinance or obtain covenant default waivers, then the outstanding balance under our credit facility could become due and payable upon acceleration by the lenders in our banking group and other agreements with cross-default provisions, if any, could become due. In addition, failure to comply with any of the covenants under our Fourth Amendment could adversely affect our ability to fund ongoing operations and growth capital requirements as well as our ability to pay distributions to our unitholders. See Note 20 "Liquidity" for further information.
	Equity Restructuring
	Effective August 9, 2013, we executed an equity restructuring agreement ("Equity Restructuring") with our General Partner and HPIP. As part of the Equity Restructuring, the Partnership's 4,526,066 subordinated units and previous incentive distribution rights (the “former IDRs,” all of which were owned by our General Partner, which is controlled by HPIP) were combined into and restructured as a new class of incentive distribution rights (the “new IDRs”). Upon the issuance of the new IDRs, the subordinated units and former IDRs were canceled. The new IDRs are allocated 85.02% to HPIP and 14.98% to our General Partner. The new IDRs entitle the holders of our incentive distribution rights to receive 48% of any quarterly cash distributions from available cash after the Partnership's common unitholders have received the full minimum quarterly distribution ($0.4125 per unit) for each quarter plus any arrearages from prior quarters (of which there are currently none).
	The Equity Restructuring Agreement also provided for the issuance of warrants to our General Partner to purchase up to 300,000 of our common units at an exercise price of $0.01 per common unit. These warrants are exercisable on the later of (i) 18 months from the equity restructuring completion date or (ii) the date that the volume weighted average trading price of our common units on the New York Stock Exchange exceeds $25.00 for 30 consecutive trading days. The warrants contain customary anti-dilution and other protections.
	Following the announcement of the Equity Restructuring, AIM Midstream Holdings, LLC, or AIM filed an action in Delaware Chancery Court against HPIP, our General Partner and us seeking either rescission of the Equity Restructuring or, in the alternative, monetary damages. While we cannot predict the ultimate outcome of this litigation, we do not believe it will be material to our operations or financial results. As a result of the action filed by AIM, the warrants that were issued by the Partnership, in conjunction with the Equity Restructuring, to the General Partner for subsequent conveyance to AIM, the owner of the Class B interest of our General Partner, were canceled effective August 29, 2013. In addition, the $12.5 million escrowed in connection with our Equity Restructuring was not released to the Partnership. Accordingly, HPIP contributed $12.5 million in cash to the Partnership on September 30, 2013, in order to permit the Partnership to satisfy obligations under our credit agreement and was accounted for as a contribution from our General Partner.
	Blackwater Terminals
	On December 17, 2013, the Partnership completed the Merger of Blackwater, an owner, developer and operator of petroleum, agricultural, and chemical liquid terminal storage facilities. Blackwater owns and operates 1.3 million barrels of storage capacity across four terminal sites located in Westwego, Louisiana; Brunswick, Georgia; Harvey, Louisiana; and Salisbury, Maryland. See Note 3 "Acquisitions" for further information.
	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 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 as of September 30, 2013, and December 31, 2012, condensed consolidated statement of operations for the three and nine months ended September 30, 2013 and 2012, statement of comprehensive income for the three and nine months ended September 30, 2013 and 2012, statement of changes in partners’ capital and noncontrolling interest for the nine months ended September 30, 2013 and 2012, and statements of cash flows for the nine months ended September 30, 2013 and 2012.
	Our financial results for the nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the full year ended December 31, 2013. 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, 2012 (“Annual Report”) filed on April 16, 2013 and ii) Exhibit 99.1 to the Current Report on Form 8-K that was filed with the Securities and Exchange Commission ("SEC") on October 1, 2013 which updated portions of our annual report.
	Effective December 17, 2013, Blackwater was acquired by the Partnership, in the form of the Merger described above, from ArcLight. However, as of April 15, 2013, an affiliate of ArcLight acquired controlling interest of the Partnership, also described above, at which time Blackwater was also an affiliate of ArcLight. As Blackwater and the Partnership were both affiliates of ArcLight as of April 15, 2013, these financial statements include the effect of Blackwater's operations starting as of the date of the establishment of common control. Therefore, these condensed consolidated financial statements include Blackwater, which have a fiscal year end of March 31, 2013, and were presented from the period April 15, 2013 through September 30, 2013. Please see Note 18 "Reporting Segments" for financial information of Blackwater as presented in our Terminals segment.
	Consolidation Policy
	Our 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 consolidated financial statements reflect our proportionate share of the revenues, expenses, assets and liabilities of this undivided interest. In July 2012, the Partnership acquired a 87.4% undivided interest in the Chatom Processing and Fractionation facility (the "Chatom System"). Our consolidated financial statements reflect the accounts of the Chatom System since acquisition, and the interests in the Chatom System held by non-affiliated working interest owners are reflected as noncontrolling interests in the Partnership's consolidated financial statements.
	Use of Estimates
	When preparing 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, product 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, 2013
Business Combinations [Abstract]	'
Acquisitions and Divestitures	'
	Acquisitions
	Blackwater Terminals
	Effective December 17, 2013, we acquired Blackwater, consisting of AL Blackwater, LLC ("ALB"), a Delaware limited liability company, Blackwater Midstream Holdings LLC, a Delaware limited liability company and a majority owned subsidiary of ALB, and Blackwater Merger Sub, LLC, a Delaware limited liability company and an indirect wholly owned subsidiary of the Partnership. Blackwater owns and operates 1.3 million barrels of storage capacity across four terminal sites located in Westwego, Louisiana; Brunswick, Georgia; Harvey, Louisiana; and Salisbury, Maryland.
	The Merger of Blackwater represents 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. Therefore, net assets received were recorded at their historical book value of $22.7 million as of the date common control was established which is April 15, 2013.
	On July 10, 2013, Blackwater acquired and purchased from Chemtura Corporation approximately 56 acres of property and improvements located in Harvey, LA for $2.5 million (the "Harvey assets"). The land is adjacent to the Mississippi River and the assets include dormant storage tanks, unoccupied buildings, a barge dock and other improvements.
	The Harvey assets when purchased did not include any employees, customer contracts, permits, licenses, offices, procedures, systems, or processes that had the ability to produce outputs; thus this asset purchase did not meet the definition of a business under the accounting guidance.
	For the three and nine months ended September 30, 2013, Blackwater contributed $3.5 million and $6.3 million, respectively, of revenue and $0.1 million and $0.7 million, respectively, of net loss attributable to the Partnership's Terminals Segment, which are included in the condensed consolidated statement of operations.
	High Point System
	Effective April 15, 2013, our General Partner contributed 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.
	The High Point System, along with $15.0 million in cash, was contributed to us by HPIP in exchange for 5,142,857 Series A Units. Of the $15.0 million cash consideration paid by HPIP, approximately $2.5 million was used to pay certain transaction expenses of HPIP, and the remaining approximately $12.5 million was used to repay borrowings outstanding under the Partnership's credit facility in connection with the Fourth Amendment. The contribution of the High Point System occurred concurrently with HPIP's acquisition of 90% of our General Partner and all of our subordinated units, which resulted in HPIP gaining control of our General Partner and a majority of our outstanding limited partner interests.
	The fair value of the Series A Units on April 15, 2013 was $17.50 per unit, or a total of $90.0 million, and was issued by the Partnership in exchange for net cash of approximately $12.5 million and net assets of $61.9 million contributed to the Partnership by our General Partner. The contribution of net assets of the High Point System was accounted for as a transaction between entities under common control whereby the High Point System was recorded at historical book value. As such, the value of the Series A Units in excess of the net assets contributed by our General Partner amounted to $15.6 million and was allocated pro-rata to our General Partner and existing limited partners' interest based on their ownership interests.
	The contribution is being treated as a transaction between entities under common control, under which the net assets received are recorded at their historical book value as of date of transfer. The following table presents the carrying value of the identified assets received and liabilities assumed at the acquisition date (in thousands):
	Cash and cash equivalents	$	1,935
	Accounts receivable	3,629
	Unbilled revenue	1,446
	Other current assets	2,049
	Property, plant and equipment, net	82,615
	Other assets	1,000
	Accounts payable	(11		)
	Accrued expenses and other current liabilities	(4,077		)
	Current portion of long-term debt	(893		)
	Asset retirement obligation liability	(25,763		)
	Total identifiable net assets	$	61,930
	Subsequent to the contribution, 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.
	Chatom Gathering, Processing and Fractionation Plant
	Effective July 1, 2012, we acquired an 87.4% undivided interest in the Chatom System from affiliates of Quantum Resources Management, LLC. The acquisition fair value consideration of $51.4 million includes a credit associated with the cash flow the Chatom System generated between January 1, 2012 and the effective date of July 1, 2012. The consideration paid by the Partnership consisted of cash, which was funded by borrowings under our credit facility.
	The Chatom System is located in Washington County, Alabama, approximately 15 miles from our Bazor Ridge processing plant in Wayne County, Mississippi, and consists of a 25 MMcf/d refrigeration processing plant, a 1,900 Bbl/d fractionation unit, a 160 long-ton per day sulfur recovery unit, and a 29 mile gas gathering system. We believe the fractionating services provide flexibility to the Partnership's product and service offerings.
	The following table presents the fair value of consideration transferred to acquire the Chatom System and the amounts of identified assets acquired and liabilities assumed at the acquisition date, as well as the fair value of the 12.6% noncontrolling interest in the Chatom System at the acquisition date (in thousands):
	Cash			$	51,377
	Recognized amounts of identifiable assets acquired and liabilities assumed:
	Unbilled revenue			$	4,535
	Property, plant and equipment			58,279
	Asset retirement cost			452
	Accounts payable			(399		)
	Accrued gas purchases			(3,631		)
	Asset retirement obligations			(452		)
	Noncontrolling interest			(7,407		)
	Total identifiable net assets			$	51,377
	The fair value of the property, plant and equipment and noncontrolling interests were estimated by applying a combination of the market and income approaches. These fair value measurements were based on significant inputs not observable in the market and thus represent a Level 3 measurement as defined by ASC 820. Primarily using the income approach, the fair value estimates were based on i) an assumed cost of capital of 9.25%, ii) an assumed terminal value based on the present value of estimated EBITDA, iii) an inflationary cost increase of 2.5%, iv) forward market prices as of July 2012 for natural gas and crude oil, v) a Federal tax rate of 35% and a state tax rate of 6.5%, and vi) an increase in processed and fractionated volumes in 2013, declining thereafter. Working capital was estimated using net realizable value. Accrued revenue was deemed to be fully collectible at July 1, 2012.
	For the three and nine months ended September 30, 2013, our 87.4% undivided interest in the Chatom System contributed $14.6 million and $41.8 million, respectively, of revenue and $1.2 million and $3.6 million, respectively, of net income attributable to the Partnership, which are included in the condensed consolidated statement of operations.
	For the three and nine months ended September 30, 2012, our 87.4% undivided interest in the Chatom System contributed $15.4 million of revenue and $2.1 million of net income attributable to the Partnership, which are included in the condensed consolidated statement of operations.
	The following table presents unaudited pro forma consolidated information of the Partnership, adjusted for the acquisition of the Chatom System, as if the acquisition had occurred on January 1, 2011:
	(unaudited, in thousands)	Nine months ended September 30, 2012
	Revenue	$	174,179
	Net income	$	1,422
	Limited partners’ net income per unit	$	0.14
	These amounts have been calculated after applying the Partnership's accounting policies and adjusting the results to reflect i) additional depreciation and amortization that would have been charged assuming fair value adjustments to property, plant and equipment, ii) recording pro forma interest expense on debt that would have been incurred to acquire the Chatom System as of January 1, 2011, iii) the elimination of transaction costs included in the historical financial statement of the Partnership which were directly related to the acquisition and iv) the elimination of the noncontrolling interest holders' proportionate share of earnings. The unaudited pro forma adjustments are based on available information and certain assumptions we believe are reasonable.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	Transactions Between Entities Under Common Control
	We may enter into transactions with our General Partner whereby we receive a contribution of midstream assets or subsidiaries in exchange for consideration from the Partnership. We account for the net assets received using the historical book value of the asset or subsidiary being contributed or transferred as these are transactions between entities under common control. Our historical financial statements may be revised to include the results attributable to the assets contributed from our General Partner as if we owned such assets for all periods presented by the Partnership since the change in control of our General Partner, effective April 15, 2013.
	Convertible Preferred Units
	We record the issuance of our Series A Preferred Units at fair value and separately classified these units on our balance sheet in between total liabilities and partners’ capital, frequently called “mezzanine equity” as the ability to exercise these units are outside of the Partnership’s control and contain no beneficial conversion features pursuant to Accounting Standards Codification 470-20, Debt with Conversion and Other Options. These units are classified as participating securities and are included in our calculation of net income (loss) per limited and general partner unit using the two-class method.
	Goodwill and intangible assets
	We record goodwill as the excess of the cost of an acquisition over the fair value of the net assets of the acquired business. Goodwill is not amortized but is reviewed for impairment at least annually or more frequently if an event or change in circumstance indicates that an impairment may have occurred. We first assess qualitative factors to evaluate whether it is more likely than not that an impairment has occurred and it is therefore necessary to perform the two-step goodwill impairment test. If the two-step goodwill impairment test indicates that the goodwill is impaired, an impairment loss is recorded.
	We record the estimated fair value of acquired customer contracts as intangible assets. The intangible assets are amortized over the remaining periods of the customer contracts, which range between 5 months and thirty-five months.
	Income taxes
	The Partnership is not a taxable entity for federal income taxes and does not directly pay federal income tax. Blackwater is a taxable entity. We account for income taxes using an asset and liability approach for financial accounting and reporting of income taxes. If it is more than likely that a deferred tax asset will not be realized, a valuation allowance is recognized.
	Recent Accounting Pronouncements
	In January 2013, the FASB issued Accounting Standards Update ("ASU") No. 2013-01, Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities, which clarifies that ASU 2011-11, Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities, applies to financial instruments or derivative transactions accounted for under ASC 815. The amendments require disclosures to present both gross and net amounts of derivative assets and liabilities that are subject to master netting arrangements with counterparties. We currently present our net derivative assets and liabilities on our statement of financial position. We have provided additional disclosures regarding the gross amounts of derivative assets and liabilities in Note 6 "Derivatives" in accordance with these new standards updates.
	In February 2013, the FASB issued ASU No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income ("AOCI"), which requires entities to present either in a single note or parenthetically on the face of the financial statements (i) the amount of significant items reclassified from each component of AOCI and (ii) the income statement line items affected by the reclassifications. We adopted this guidance during the first quarter of 2013; it did not have a material impact on our condensed consolidated financial statements as there are currently no items reclassified from AOCI.
	In July 2013, the FASB issued ASC 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 is effective prospectively for the Partnership’s fiscal year beginning January 1, 2014 and we are currently evaluating the financial impact.

Concentration_of_Credit_Risk_a

Concentration of Credit Risk and Trade Accounts Receivable	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Concentration of Credit Risk and Trade Accounts Receivable	'
	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 nine months ended September 30, 2013 and 2012, 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 consolidated statement of operations for the each of the periods presented below:
		Three months ended September 30,				Nine months ended September 30,
		2013		2012		2013		2012
	Customer A	26	%	23	%	28	%	29	%
	Customer B	13	%	17	%	13	%	—	%
	Customer C	12	%	11	%	12	%	12	%
	Customer D	—	%	12	%	—	%	16	%
	Other	49	%	37	%	47	%	43	%
	Total	100	%	100	%	100	%	100	%

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2013
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. 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. Currently, the commodity derivatives are in the form of swaps, puts and collars. As of September 30, 2013, the aggregate notional volume of our commodity derivatives was 3.0 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, 2013, 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.
	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 the cash flows related to our long-term variable rate debt into fixed rate cash flows. As of September 30, 2013, the notional amount of our interest rate swap was $100 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 quarter of 2013, we entered into a weather derivative to mitigate the impact of potential unfavorable weather to our operations under which we could receive payments totaling up to $10 million in the event that a hurricane or hurricanes of certain strength pass through the area as identified in the derivative agreement. The weather derivative is being accounted for using the intrinsic value method, under which the fair value of the contract is zero and any amounts received are recognized as gains during the period received. The weather derivative was entered into with a single counterparty and we were not required to post collateral. We paid a premium of approximately $1.1 million which is recorded in Risk management assets on the condensed consolidated balance sheet and is being amortized to Direct operating expense on a straight-line basis over the 12 month term of the contract. As of September 30, 2013, the unamortized amount of the risk management asset was approximately $0.8 million.
	As of September 30, 2013 and December 31, 2012, the value associated with our commodity derivatives, interest rate swap instrument 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, 2013			December 31, 2012			September 30, 2013				December 31, 2012			September 30, 2013			December 31, 2012
	Current		$	1,196		$	1,889		$	(146	)		$	(920	)	$	1,050		$	969
	Noncurrent		—			—			—				—			—			—
	Total assets		$	1,196		$	1,889		$	(146	)		$	(920	)	$	1,050		$	969
	Current		$	—		$	—		$	(349	)		$	—		$	(349	)	$	—
	Noncurrent		—			—			(122		)		—			(122		)	—
	Total liabilities		$	—		$	—		$	(471	)		$	—		$	(471	)	$	—
	For the three and nine months ended September 30, 2013 and 2012, 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
	2013
	Gain (loss) on commodity derivatives, net	$	261		$	(760	)	$	797			$	(687	)
	Interest expense	(101		)	(153		)	(101		)		(471		)
	Direct operating expenses	(284		)	—			(378		)		—
	Total	$	(124	)	$	(913	)	$	318			$	(1,158	)
	2012
	Gain (loss) on commodity derivatives, net	$	816		$	(1,762	)	$	1,425			$	1,732

Fair_Value_Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2013
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. We recognize transfers between levels at the end of the reporting period for which the transfer has occurred. We recognized transfers out of Level 3 into Level 2 as a result of changes in tenure and market points of certain contracts in the amount of $1.0 million for the year ended December 31, 2012. There were no such transfers for the three and nine months ended September 30, 2013 and 2012.
	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 balance sheet, that were measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 (in thousands):
		Carrying			Estimated Fair Value
		Amount			Level 1		Level 2			Level 3		Total
	Commodity derivative instruments, net
	September 30, 2013	$	294		$	—	$	294		$	—	$	294
	31-Dec-12	$	969		$	—	$	969		$	—	$	969
	Interest rate swap
	30-Sep-13	$	(472	)	$	—	$	(472	)	$	—	$	(472	)
	31-Dec-12	$	—		$	—	$	—		$	—	$	—
	The premium paid to enter the weather derivative described in Note 6 "Derivatives", is included within Risk management assets on the 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, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment	'
	Property, Plant and Equipment
	Property, plant and equipment, net, as of September 30, 2013 and December 31, 2012 were as follows (in thousands):
		Useful Life	September 30,			December 31, 2012
		(in years)	2013
	Land	N/A	$	6,068		$	2,254
	Construction in progress	N/A	5,949			5,053
	Base gas	N/A	1,108			—
	Buildings and improvements	4 to 40	3,537			1,432
	Processing and treating plants	8 to 40	98,819			98,106
	Pipelines	5 to 40	236,450			163,447
	Compressors	4 to 20	11,278			8,957
	Dock	20 to 40	7,942			—
	Tanks, truck rack and piping	20 to 40	22,353			—
	Equipment	8 to 20	5,875			4,785
	Computer software	5	2,566			1,950
	Total property, plant and equipment		401,945			285,984
	Accumulated depreciation		(85,290		)	(62,165		)
	Property, plant and equipment, net		$	316,655		$	223,819
	Of the gross property, plant and equipment balances at September 30, 2013 and December 31, 2012, $99.5 million and $26.1 million, respectively, were related to AlaTenn, Midla and HPGT, our FERC regulated interstate and intrastate assets.
	Capitalized interest was less than $0.1 million and $0.1 million for the three and nine months ended September 30, 2013, respectively.
	Depreciation expense was $6.5 million and $18.9 million for the three and nine months ended September 30, 2013, respectively.
	Asset Impairments
	During the second quarter of 2013, management determined to change its commercial approach towards certain non-strategic gathering and processing assets. As a result, an asset impairment charge of $15.2 million was recorded in the three months ended June 30, 2013. 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. Primarily using the income approach, the fair value estimates are based on i) present value of estimated EBITDA, ii) an assumed discount rate of 10.0%, and iii) a decline in throughput volumes of 2.5% in 2013 and thereafter.
	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. As a result, certain gathering and processing assets were written down by $1.8 million to the estimated fair value less cost to sell. See Note 4 "Discontinued Operations".
	Insurance proceeds
	Involuntary conversions result from the loss of an asset because of some unforeseen event (e.g., destruction due to hurricanes). Some of these events are insurable, thus resulting in a property damage insurance recovery. Amounts we receive from insurance carriers are net of any deductibles related to the covered event. During the three and nine months ended September 30, 2013, we collected zero and $1.1 million, respectively, of nonrefundable cash proceeds from our insurance carrier. During the first quarter of 2013, $0.5 million of nonrefundable cash proceeds were recognized as an offset to property, plant and equipment write-downs of $0.1 million and presented as $0.4 million under the caption Gain (loss) on involuntary conversion of property, plant and equipment. During the second quarter of 2013, $0.6 million of nonrefundable cash proceeds were associated with business interruption insurance and recorded to Revenue in the condensed consolidated statement of operations.

Asset_Retirement_Obligation

Asset Retirement Obligation	9 Months Ended
	Sep. 30, 2013
Asset Retirement Obligation Disclosure [Abstract]	'
Asset Retirement Obligation	'
	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.
	The following table is a reconciliation of the asset retirement obligations (in thousands):
	Asset retirement obligation at December 31, 2012	$	8,319
	Obligations assumed	25,763
	Accretion expense	358
	Asset retirement obligation at September 30, 2013	$	34,440
	We recorded accretion expense, which is included in Depreciation, amortization and accretion expense, of approximately $0.2 million and approximately $0.4 million in our consolidated statements of operations for each of the three and nine months ended September 30, 2013, respectively, and less than $0.1 million for the three and nine months ended September 30, 2012.
	We are required to establish security against any potential secondary obligations relating to the abandonment of the 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 $1.0 million and is presented in Other assets, net in our condensed consolidated balance sheet as of September 30, 2013.

Debt_Obligations

Debt Obligations	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Debt Obligations	'
	Debt Obligations
	Credit facility
	As of December 31, 2012, the total leverage to EBITDA ratio (the "Consolidated Total Leverage Ratio"), one of the primary financial covenants that we were required to maintain under our credit facility, was limited to a maximum of 4.50 to 1.00. At December 31, 2012, our total indebtedness was approximately $130.9 million, which caused our total leverage to EBITDA ratio to be approximately 5.70 to 1.00. As a result, on December 26, 2012, the Partnership entered into the Third Amendment and Waiver to Credit Agreement, dated as of December 26, 2012 (the “Third Amendment”). The Third Amendment provided for a waiver of the Partnership's compliance with the Consolidated Total Leverage Ratio with respect to the quarter ended December 31, 2012 and for one month thereafter. The Third Amendment also required the Partnership to provide certain financial and operating information of the Partnership on a monthly basis for 2013 and for any month after 2013 in which the Consolidated Total Leverage Ratio of the Partnership is in excess of 4.00 to 1.00. The remaining material terms and conditions of the senior secured revolving credit facility, including pricing, maturity and covenants, remained unchanged by the Third Amendment.
	On January 24, 2013, the Partnership entered into the second waiver to the credit facility that extended the waiver period with respect to the Consolidated Total Leverage Ratio to March 31, 2013 (and subsequently extended to April 16, 2013). Additional covenants during the waiver period included i) total outstanding borrowings under the credit facility shall not exceed $150.0 million; ii) restrictions on certain acquisitions; iii) an increase to the Eurodollar Rate by 0.50%; iv) additional fees of 0.125% of the principal amount on each of February 28, 2013 and March 31, 2013; and v) execution of a compliance certificate.
	On April 15, 2013, we repaid approximately $12.5 million in outstanding borrowings under the credit agreement and entered into the Fourth Amendment in connection with the ArcLight Transaction. As a result, we had approximately $130 million of outstanding borrowings as of April 15, 2013 and approximately $45 million of available borrowing capacity.
	On September 30, 2013, we received $12.5 million from HPIP which was used to repay outstanding borrowings under the credit agreement. Please see Note 12 "Partners' Capital" for more details.
	We were in compliance with the Consolidated Total Leverage Ratio test, which was 4.48 under our credit facility as of September 30, 2013, in accordance with the leverage covenants as modified in the Fourth Amendment to the credit facility executed on April 15, 2013. As of September 30, 2013, we had approximately $123.7 million of outstanding borrowings and approximately $39.3 million of available borrowing capacity. For the nine months ended September 30, 2013 and 2012, the weighted average interest rate on borrowings under our credit facility was approximately 4.50% and 4.09%, respectively.
	See Note 20 "Liquidity" for further updates to our liquidity and long-term debt.
	Other debt
	Other debt represents insurance premium financing in the original amounts of $3.3 million bearing interest at between 3.22% and 4.00% per annum, which is repayable in equal monthly installments of approximately $0.2 million through the fourth quarter of 2013.
	Blackwater debt
	As a result of the Merger, all outstanding debt held by Blackwater was settled in full upon closing the transaction. However, the Merger of Blackwater represents 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 the date when common control was established, whichever is later. As such, long-term debt of Blackwater held as of September 30, 2013 is included herein and consists of notes and loans with counterparties as well as a loan with an affiliate of ArcLight Capital Partners, LLC.
	Our outstanding borrowings at September 30, 2013 and December 31, 2012, respectively, were as follows (in thousands):
		September 30,		December 31, 2012
		2013
	Revolving loan facility	$	121,035	$	128,285
	Other debt	157		—
	Loans associated with Blackwater:
	Note, prime plus 1.5% interest, issued October 2010 and due September 2014	1,174		—
	Term loan, 4.5% interest, issued February 2012 and due August 2017	1,104		—
	Term loan, JPM prime rate interest, issued June 2012 and due May 2018	2,477		—
	Term loan, JPM prime rate interest, issued March 2013 and due September 2018	1,348		—
	Convertible promissory note with affiliate, 10% interest, issued October 2012 and due October 2013	20,000		—
	Term loan, JPM prime rate interest, issued July 2013 and due July 2014	1,299		—
	Term loan, JPM prime rate interest, issued July 2013 and due July 2014	3,575		—
	Total debt	152,169		128,285
	Less: current portion of loans to affiliate	20,000		—
	Less: current portion of long-term debt	7,281		—
	Total debt net of current portion	$	124,888	$	128,285
	At September 30, 2013 and December 31, 2012, letters of credit outstanding under the credit facility totaled $2.6 million.
	In connection with our credit facility and amendments thereto, we incurred $5.9 million in debt issuance costs that are being amortized on a straight-line basis over the term of the credit facility.

Partners_Capital

Partners' Capital	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Partners' Capital	'
	Partners’ Capital and Convertible Preferred Units
	Our capital accounts are comprised of approximately 2% general partner interest and 98% 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 new IDRs that are non-voting limited partner interests held by our General Partner.
	Equity Restructuring
	Effective August 9, 2013, we executed an equity restructuring agreement ("Equity Restructuring") with our General Partner and HPIP. As part of the Equity Restructuring, the Partnership's 4,526,066 subordinated units and previous incentive distribution rights (the “former IDRs,” all of which were owned by our General Partner, which is controlled by HPIP) were combined into and restructured as a new class of incentive distribution rights (the “new IDRs”). Upon the issuance of the new IDRs, the subordinated units and former IDRs were cancelled. The new IDRs are allocated 85.02% to HPIP and 14.98% to our General Partner. The new IDRs entitle the holders of our incentive distribution rights to receive 48% of any quarterly cash distributions from available cash after the Partnership's common unitholders have received the full minimum quarterly distribution ($0.4125 per unit) for each quarter plus any arrearages from prior quarters (of which there are currently none).
	The Equity Restructuring also provided for the issuance of warrants to our General Partner to purchase up to 300,000 of our common units at an exercise price of $0.01 per common unit. These warrants are exercisable on the later of (i) 18 months from the equity restructuring completion date and (ii) the date that the volume weighted average trading price of our common units on the New York Stock Exchange exceeds $25.00 for 30 consecutive trading days. The warrants contain customary anti-dilution and other protections.
	Following the announcement of the Equity Restructuring, AIM Midstream Holdings, LLC, or AIM filed an action in Delaware Chancery Court against HPIP, our General Partner and us seeking either rescission of the Equity Restructuring or, in the alternative, monetary damages. While we cannot predict the ultimate outcome of this litigation, we do not believe it will be material to our operations or financial results. As a result of the action filed by AIM, the warrants that were issued by the Partnership, in conjunction with the Equity Restructuring, to the General Partner for subsequent conveyance to AIM, the owner of the Class B interest of our General Partner, were canceled effective August 29, 2013. In addition, the $12.5 million escrowed in connection with our Equity Restructuring was not released to the Partnership. Accordingly, HPIP contributed $12.5 million in cash to the Partnership on September 30, 2013, in order to permit the Partnership to satisfy obligations under our credit agreement and was accounted for as a contribution from our General Partner.
	Series A Convertible Preferred Units
	On April 15, 2013, the Partnership, our General Partner and AIM entered into the ArcLight Transactions with HPIP, pursuant to which HPIP (i) acquired 90% of our General Partner and all of our subordinated units from AIM Midstream Holdings and (ii) contributed certain midstream assets and $15.0 million in cash to us in exchange for 5,142,857 Series A Units issued by the Partnership. Of the $15.0 million cash consideration paid by HPIP, approximately $2.5 million was used to pay certain transaction expenses of HPIP, and the remaining approximately $12.5 million was used to repay borrowings outstanding under the Partnership's credit facility in connection with the Fourth Amendment. As a result of these transactions, which were also consummated on April 15, 2013, HPIP acquired both control of our General Partner and a majority of our outstanding limited partnership interests. On April 15, 2013, our General Partner entered into the Third Amended & Restated Agreement of Limited Partnership (the “Amended Partnership Agreement”) of the Partnership providing for the creation and designation of the rights, preferences, terms and conditions of the Series A Units.
	The Series A Units receive distributions prior to distributions to Partnership common unitholders. Through October 1, 2014, the distributions to the Series A Unitholders are equal to $0.25 per unit and additional Series A Units in an amount equal to the cash portion of the distribution. Subsequent to that date, the distribution will be the greater of the distribution to be made to common unitholders or approximately $0.50 per unit. The Series A Units may be converted into common units on a one-to-one basis, subject to customary anti-dilutive adjustments, at the option of the unitholders on or any time after January 1, 2014.
	Upon any liquidation and winding up of the Partnership or the sale of substantially all of the assets of the Partnership, the holders of Series A Units generally will be entitled to receive, in preference to the holders of any of the Partnership's other securities, an amount equal to the sum of $17.50 multiplied by the number of Series A Units owned by such holders, plus all accrued but unpaid distributions on such Series A Units.
	Prior to the consummation of any recapitalization, reorganization, consolidation, merger, spin-off or other business combination in which the holders of common units are to receive securities, cash or other assets (a “Partnership Event”), we are obligated to make an irrevocable written offer, subject to consummation of the Partnership Event, to each holder of Series A Units to redeem all (but not less than all) of such holder's Series A Units for a price per Series A Unit payable in cash equal to the greater of:
	•	the sum of $17.50 and all accrued and accumulated but unpaid distributions for each Series A Unit; or
	•	an amount equal to the product of:
	(i) the number of common units into which each Series A Unit is convertible; and
	(ii) the sum of:
	(A) the cash consideration per common unit to be paid to the holders of common units pursuant to the Partnership Event, plus
	(B) the fair market value per common unit of the securities or other assets to be distributed to the holders of the common units pursuant to the Partnership Event.
	Upon receipt of such a redemption offer from us, each holder of Series A Units may elect to receive such cash amount or a preferred security issued by the person surviving or resulting from such Partnership Event and containing provisions substantially equivalent to the provisions set forth in the Amended Partnership Agreement with respect to the Series A Units without material abridgement.
	Except as provided in the Amended Partnership Agreement, the Series A Units have voting rights that are identical to the voting rights of the common units and will vote with the common units as a single class, with each Series A Unit entitled to one vote for each common unit into which such Series A Unit is convertible.
	The fair value of the Series A Units on April 15, 2013 was $17.50 per unit, or a total of $90.0 million and was issued by the Partnership in exchange for cash of approximately $12.5 million and net assets of $61.9 million contributed to the Partnership by our General Partner. The contribution of net assets of the High Point System was accounted for as a transaction between entities under common control whereby the High Point System was recorded at historical book value. As such, the value of the Series A Units in excess of the net assets contributed by our General Partner amounted to $15.6 million and was allocated pro-rata to our General Partner and existing limited partners' interest based on their ownership interests. The fair value measurement was based on significant inputs not observable in the market and thus represent a Level 3 measurement as defined by ASC 820. Primarily using the income approach, the fair value estimate was based on i) present value of estimated future contracted distributions, ii) an assumed discount rate of 18.0%, and iii) an assumed distribution growth rate of 1.0% in 2014 and thereafter.
	The fair value of the additional Series A Units in an amount equal to the cash portion of the distribution was $21.15 per unit, or a total distribution of $1.6 million for the three months ended September 30, 2013. Primarily using the market and income approach, the fair value estimate was based on i) present value of estimated future contracted distributions, ii) an option value of $3.18 per unit using a Black-Scholes model, iii) an assumed discount rate of 10.0%, and iv) an assumed distribution growth rate of 1.0% in 2014 and thereafter.
	The numbers of units outstanding as of September 30, 2013 and December 31, 2012, respectively, were as follows (in thousands):
		September 30,			December 31, 2012
		2013
	Limited partner common units	4,705			4,639
	Limited partner subordinated units	—			4,526
	Series A Units	5,204			—
	General partner units	185			185
	Net Income (Loss) attributable to Limited and General Partner Units
	Net income (loss) attributable to our General Partner and the limited partners (common and subordinated unit holders) is allocated in accordance with their respective ownership percentages, after giving effect to incentive distributions paid to our General Partner. Basic net income per limited partner unit is computed based on the weighted average number of units outstanding during the period. Diluted net income per limited partner unit is computed based on the weighted average number of units plus the effect of dilutive potential units outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to distributions (whether paid or unpaid) are classified as participating securities and are included in our computation of diluted net income per limited partner unit. There was no dilutive effect of unit based awards for the three and nine months ended September 30, 2013 and 2012.
	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 our Partnership agreement, regardless of whether our 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 our 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 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 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 our General Partner, even though we make distributions on the basis of available cash and not earnings.
	The following table is the calculation of net income (loss) per limited partner unit for the three and nine months ended September 30, 2013 and 2012, respectively (in thousands, with the exception of per unit amounts):
		Three months ended September 30,							Nine months ended September 30,
		2013				2012			2013			2012
	Net loss from continuing operations	$	(2,632	)		$	(4,014	)	$	(26,097	)	$	(102	)
	Net income attributable to noncontrolling interests	$	190			$	249		$	533		$	249
	Net loss from continuing operations attributable to the Partnership	$	(2,822	)		$	(4,263	)	$	(26,630	)	$	(351	)
	Less:
	Declared cash distributions on Series A Units	1,301				—			2,375			—
	Declared PIK distributions on Series A Units	1,572				—			2,912			—
	Fair value of Series A Units in excess of value of contributed High Point System	—				—			15,612			—
	General partner's distribution	80				80			240			241
	General partner's share in undistributed loss	(170		)		(166		)	(1,074		)	(248		)
	Blackwater net loss from continuing operations	(122		)		—			(536		)	—
	Net loss from continuing operations available to limited partners	$	(5,483	)		$	(4,177	)	$	(46,159	)	$	(344	)
	Net loss attributable to the Partnership	$	(2,731	)		$	(4,275	)	$	(28,396	)	$	(257	)
	Less:
	Declared cash distributions on Series A Units	1,301				—			2,375			—
	Declared PIK distributions on Series A Units	1,572				—			2,912			—
	Fair value of Series A Units in excess of value of contributed High Point System	—				—			15,612			—
	General partner's distribution	80				80			240			241
	General partner's share in undistributed loss	(167		)		(166		)	(1,102		)	(246		)
	Blackwater net loss	(175		)		—			(650		)	—
	Net loss available to limited partners	$	(5,342	)		$	(4,189	)	$	(47,783	)	$	(252	)
	Weighted average number of units used in computation of limited partners’ net (loss) income per unit (basic and diluted)	6,663				9,108			8,334			9,103
	Limited partners’ net loss from continuing operations per unit (basic and diluted)	$	(0.82	)		$	(0.46	)	$	(5.54	)	$	(0.04	)
	Limited partners’ net loss per unit (basic and diluted)	$	(0.80	)		$	(0.46	)	$	(5.73	)	$	(0.03	)
	Distributions
	We made distributions of $16.7 million and $12.1 million in the nine months ended September 30, 2013 and 2012, respectively. We made no distributions in respect of our General Partner’s incentive distribution rights during 2013 or 2012. 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 of our operating cashflow.
	For the Series A Unit distributions as of September 30, 2013, we have accrued $1.3 million for the cash portion of the distribution and $1.6 million for the paid-in-kind Series A Units. The distributions will be made in the fourth quarter of 2013.

LongTerm_Incentive_Plan

Long-Term Incentive Plan	9 Months Ended
	Sep. 30, 2013
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. On November 2, 2009, the board of directors of our General Partner adopted a long-term incentive plan (“LTIP”) for its employees, consultants and directors who perform services for it or its affiliates. On May 25, 2010, the board of directors of our General Partner adopted an amended and restated LTIP. On July 11, 2012, the board of directors of our General Partner adopted a second amended and restated LTIP that effectively increased available awards by 871,750 units. At September 30, 2013 and December 31, 2012, 846,203 and 920,193 units, respectively, were available for future grant under the LTIP, giving retroactive treatment to the reverse unit split in connection with our recapitalization described in our Annual Report.
	Ownership in the awards is subject to forfeiture until the vesting date. The LTIP is administered by the Compensation Committee of the board of directors of our General Partner. The board of directors of our General Partner, 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, our General Partner 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 ("DERs"). 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 our unit-based awards for each of the periods indicated, in units:
		Three Months Ended				Nine months ended
		September 30,				September 30,
		2013		2012		2013		2012
	Outstanding at beginning of period	96,733		172,551		90,938		162,860
	Granted	28,042		—		108,430		34,560
	Forfeited	(893	)	(12,517	)	(13,320	)	(12,517	)
	Vested	(24,482	)	—		(86,648	)	(24,869	)
	Outstanding at end of period	99,400		160,034		99,400		160,034
	Fair value per unit	$13.36 to $21.89		$14.70 to  $21.40		$13.36 to $21.89		$14.70 to  $21.40
	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, 2013 and 2012 was $0.4 million and $0.5 million, respectively, and for the nine months ended September 30, 2013 and 2012 was $1.8 million and $1.3 million, respectively, which is 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 $1.6 million and $0.5 million for the nine months ended September 30, 2013 and 2012, respectively.
	The total compensation cost related to unvested awards not yet recognized at September 30, 2013 and 2012 was $1.1 million and $2.1 million, respectively, and the weighted average period over which this cost is expected to be recognized as of September 30, 2013 is approximately 1.6 years.

PostEmployment_Benefits

Post-Employment Benefits	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Post-Employment Benefits	'
	Post-Employment Benefits
	We sponsor a contributory post-retirement plan that provides medical, dental and life insurance benefits for qualifying U.S. retired employees (referred to as the “OPEB Plan”).
	The following table summarizes the components of net periodic benefit recognized in the condensed consolidated statements of operations (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Service cost	$	1		$	1		$	3		3
	Interest cost	4			4			12			12
	Expected return on plan assets	(17		)	(16		)	(51		)	(49		)
	Amortization of net gain	(6		)	(9		)	(18		)	(27		)
	Net periodic benefit	$	(18	)	$	(20	)	$	(54	)	$	(61	)
	Future contributions to the Plans
	We expect to make contributions to the OPEB Plan for the year ended December 31, 2013 of $0.1 million.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies Disclosure [Text Block]	'
	Commitments and Contingencies
	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 tortuous interference with contract against the Partnership and seeks either rescission of the Equity Restructuring Agreement or, in the alternative, monetary damages. While we cannot predict the ultimate outcome of this litigation, we do not believe it will be material to our operations or financial results.
	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.
	Commitments and contractual obligations
	Future non-cancelable commitments related to certain contractual obligations as of September 30, 2013 are presented below (in thousands):
		Payments Due by Period
		Total		2013		2014		2015		2016		2017		Thereafter
	Operating leases and service contracts (a)	$	4,282	$	154	$	793	$	762	$	531	$	506	$	1,536
	Asset retirement obligations	34,440		—		—		—		7,867		—		26,573
	Total	$	38,722	$	154	$	793	$	762	$	8,398	$	506	$	28,109
	(a) Operating leases and service contracts have been reduced by total minimum sublease rentals of $0.2 million due in the future under non-cancelable subleases.
	Total expenses related to operating leases, asset retirement obligations, land site leases and right-of-way agreements were (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Operating leases	$	357	$	254	$	841	$	692
	Asset retirement obligation	191		10		358		23
		$	548	$	264	$	1,199	$	715

RelatedParty_Transactions

Related-Party Transactions	9 Months Ended
	Sep. 30, 2013
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, 2013, administrative and operational services expenses of $3.3 million and $10.3 million, respectively, were charged to us by our General Partner. During the three and nine months ended September 30, 2012, administrative and operational services expenses of $3.1 million and $9.3 million, respectively, were charged to us by our General Partner. For the three and nine months ended September 30, 2013, our General Partner incurred approximately $0.2 million and $0.6 million, respectively, of costs associated with certain business development activities. If the business development activities result in a project that will be pursued and funded by the Partnership, we will reimburse our General Partner for the business development costs related to that project. For the three and nine months ended September 30, 2013, we incurred business development costs of approximately $0.9 million associated with projects 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.

Reporting_Segments

Reporting Segments	9 Months Ended
	Sep. 30, 2013
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, which include transporting raw natural gas from the wellhead through gathering systems, treating the raw natural gas, processing raw natural gas to separate the NGLs from the natural gas, performing fractionation and selling or delivering pipeline-quality natural gas and NGLs to various markets and pipeline systems, to producers of natural gas and oil.
	Transmission
	Our Transmission segment transports and delivers natural gas from producing wells, receipt points or pipeline interconnects for shippers and other customers, including local distribution companies, or LDCs, utilities, and industrial and 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 crude oil, bunker fuel, distillates, chemicals 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 contribution of the High Point System, which occurred concurrently with HPIP's acquisition of 90% of our General Partner, is presented within our Transmission Segment. The acquisiton of Blackwater is presented within our Terminals Segment. The following tables set forth our segment information for the three and nine months ended September 30, 2013 and 2012 (in thousands):
		Three months ended September 30,
		2013										2012
		Gathering			Transmission		Terminals		Total			Gathering			Transmission		Total
		and										and
		Processing										Processing
	Revenue	$	48,873		$	27,704	$	3,458	$	80,035		$	41,637		$	12,710	$	54,347
	Loss on commodity derivatives, net	(499		)	—		—		(499		)	(946		)	—		(946		)
	Total revenue	48,374			27,704		3,458		79,536			40,691			12,710		53,401
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	38,162			19,811		—		57,973			32,105			9,260		41,365
	Direct operating expenses	3,720			3,994		630		8,344			3,567			1,762		5,329
	Selling, general and administrative expenses								5,157								3,246
	Equity compensation expense								392								474
	Depreciation, amortization and accretion expense								7,880								5,504
	Total operating expenses								79,746								55,918
	Gain on sale of assets, net								—								4
	Operating loss								(210		)						(2,513		)
	Interest and other expense								(2,636		)						(1,501		)
	Net loss before income tax benefit								(2,846		)						(4,014		)
	Income tax benefit								214								—
	Net loss from continuing operations								(2,632		)						(4,014		)
	Gain (loss) on discontinued operations (a)								91								(12		)
	Net loss								(2,541		)						(4,026		)
	Less: Net income attributable to noncontrolling interests								190								249
	Net loss attributable to the Partnership								$	(2,731	)						$	(4,275	)
	Segment gross margin (b) (c)	$	10,688		$	7,864	$	2,828	$	21,380		$	10,310		$	2,668	$	12,978
		Nine months ended September 30,
		2013										2012
		Gathering			Transmission		Terminals		Total			Gathering			Transmission		Total
		and										and
		Processing										Processing
	Revenue	$	144,658		$	65,532	$	6,326	$	216,516		$	101,307		$	37,116	$	138,423
	Gain on commodity derivatives, net	110			—		—		110			3,157			—		3,157
	Total revenue	144,768			65,532		6,326		216,626			104,464			37,116		141,580
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	116,568			46,103		—		162,671			74,775			25,300		100,075
	Direct operating expenses	10,694			8,943		1,261		20,898			7,531			4,019		11,550
	Selling, general and administrative expenses								13,748								10,101
	Equity compensation expense								1,877								1,272
	Depreciation, amortization and accretion expense								22,271								15,722
	Total operating expenses								221,465								138,720
	Gain on involuntary conversion of property, plant and equipment								343								—
	Gain on sale of assets, net								—								121
	Loss on impairment of property, plant and equipment								(15,232		)						—
	Operating (loss) income								(19,728		)						2,981
	Interest and other expense								(6,958		)						(3,083		)
	Net loss before income tax benefit								(26,686		)						(102		)
	Income tax benefit								589								—
	Net loss from continuing operations								(26,097		)						(102		)
	(Loss) gain on discontinued operations (a)								(1,766		)						94
	Net loss								(27,863		)						(8		)
	Less: Net income attributable to noncontrolling interests								533								249
	Net loss attributable to the Partnership								$	(28,396	)						$	(257	)
Segment gross margin (b) (c)	$	28,454		$	19,296	$	5,065	$	52,815		$	27,321		$	9,472	$	36,793
(a)	Gain (loss) on discontinued operations impacts our Gathering and Processing Segment.
(b)	Segment gross margin for our Gathering and Processing Segment consists of revenue, realized gain (loss) on commodity derivatives less construction, operating and maintenance agreement (“COMA”) income, less purchases of natural gas, NGLs and condensate. Segment gross margin for our Transmission Segment consists of revenue, less COMA income, less purchases of natural gas. 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. Effective October 1, 2012, we changed our segment gross margin measure to exclude COMA income. For the three months ended September 30, 2013 and 2012, $0.3 million and less than $0.1 million, respectively in COMA income was excluded from our Gathering and Processing segment gross margin and less than $0.1 million and $0.8 million, respectively, in COMA income was excluded from our Transmission Segment gross margin. For the nine months ended September 30, 2013 and 2012, $0.4 million and $0.6 million, respectively, in COMA income was excluded from our Gathering and Processing Segment gross margin and $0.1 million and $2.3 million, respectively, in COMA income was excluded from our Transmission segment gross margin.
(c)	Segment gross margin for our Terminals segment consists of revenue generated from fee-based compensation on guaranteed "take or pay" contracts and throughput fees charged to our customers less direct operating expense which includes direct labor, general materials and supplies and direct overhead.
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

Subsidiary Guarantors	9 Months Ended
	Sep. 30, 2013
Subsidiary Guarantors [Abstract]	'
Subsidiary Guarantors	'
	Subsidiary Guarantors
	The Partnership has filed a registration statement on Form S-3 with the SEC to register, among other securities, the future issuance of debt securities. The subsidiaries of the Partnership (the "Subsidiaries") are co-registrants with the Partnership for the purpose of issuing 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. Beginning July 1, 2012, the Partnership has had an investment in the non-guarantor subsidiaries equal to a 87.4% 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 provides 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 unaudited condensed consolidating financial information, the Partnership's investments in its Subsidiaries and the guarantor subsidiaries' investment in its 87.4% 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, 2013 and December 31, 2012 and for the three and nine months ended September 30, 2013 and 2012 are as follows (in thousands):
		Condensed Consolidating Balance Sheet
		30-Sep-13
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
	Assets
	Current assets
	Cash and cash equivalents	$	1		$	3,472		$	—		$	—		$	3,473
	Accounts receivable	—			4,144			1,502			—			5,646
	Unbilled revenue	—			20,107			3,649			—			23,756
	Risk management assets	—			1,050			—			—			1,050
	Other current assets	—			4,753			473			—			5,226
	Current assets held for sale	—			1,276			—			—			1,276
	Total current assets	1			34,802			5,624			—			40,427
	Property, plant and equipment, net	—			257,864			58,791			—			316,655
	Noncurrent assets held for sale, net	—			3,016			—			—			3,016
	Intangible assets, net	—			4,351			—			—			4,351
	Goodwill	—			16,447			—			—			16,447
	Deferred tax asset	—			5,741			—			—			5,741
	Investment in subsidiaries	149,782			53,607			—			(203,389		)	—
	Other assets, net	—			6,202			—			—			6,202
	Total assets	$	149,783		$	382,030		$	64,415		$	(203,389	)	$	392,839
	Liabilities, Equity and Partners’ Capital
	Current liabilities
	Accounts payable	$	—		$	2,038		$	210		$	—		$	2,248
	Accrued gas purchases	—			13,706			2,614			—			16,320
	Accrued expenses and other current liabilities	856			16,576			116			—			17,548
	Risk management liabilities	—			349			—			—			349
	Current portion of long-term debt	—			7,281			—			—			7,281
	Current portion of loans to affiliate	—			20,000			—			—			20,000
	Current liabilities held for sale	—			1,355			—			—			1,355
	Total current liabilities	856			61,305			2,940			—			65,101
	Risk management liabilities	—			122			—			—			122
	Assets retirement obligations	—			33,972			468			—			34,440
	Other liabilities	—			215			—			—			215
	Long-term debt	—			124,888			—			—			124,888
	Deferred tax liability	—			10,760			—			—			10,760
	Long-term liabilities held for sale	—			986			—			—			986
	Total liabilities	856			232,248			3,408			—			236,512
	Convertible preferred units	92,912			—			—			—			92,912
	Total partners' capital	56,015			149,782			53,607			(203,389		)	56,015
	Noncontrolling interest	—			—			7,400			—			7,400
	Total equity and partners' capital	56,015			149,782			61,007			(203,389		)	63,415
	Total liabilities, equity and partners' capital	$	149,783		$	382,030		$	64,415		$	(203,389	)	$	392,839
		Condensed Consolidating Balance Sheet
		31-Dec-12
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
	Assets
	Current assets
	Cash and cash equivalents	$	1		$	575		$	—		$	—		$	576
	Accounts receivable	—			1,612			346			—			1,958
	Unbilled revenue	—			18,102			3,410			—			21,512
	Risk management assets	—			969			—			—			969
	Other current assets	—			2,967			259			—			3,226
	Total current assets	1			24,225			4,015			—			28,241
	Property, plant and equipment, net	—			165,001			58,818			—			223,819
	Investment in subsidiaries	80,164			51,613			—			(131,777		)	—
	Other assets, net	—			4,636			—			—			4,636
	Total assets	$	80,165		$	245,475		$	62,833		$	(131,777	)	$	256,696
	Liabilities, Equity and Partners’ Capital
	Current liabilities
	Accounts payable	$	—		$	5,100		$	427		$	—		$	5,527
	Accrued gas purchases	—			14,606			2,428			—			17,034
Accrued expenses and other current liabilities	—			9,150			469			—			9,619
Total current liabilities	—			28,856			3,324			—			32,180
Asset retirement obligations	—			7,861			458			—			8,319
Other liabilities	—			309			—			—			309
Long-term debt	—			128,285			—			—			128,285
Total liabilities	—			165,311			3,782			—			169,093
Total partners' capital	80,165			80,164			51,613			(131,777		)	80,165
Noncontrolling interest	—			—			7,438			—			7,438
Total equity and partners' capital	80,165			80,164			59,051			(131,777		)	87,603
Total liabilities, equity and partners' capital	$	80,165		$	245,475		$	62,833		$	(131,777	)	$	256,696
	Condensed Consolidating Statements of Operations
	Three months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Revenue	$	—		$	66,363		$	14,562		$	(890	)	$	80,035
Loss on commodity derivatives, net	—			(499		)	—			—			(499		)
Total revenue	—			65,864			14,562			(890		)	79,536
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			47,361			11,502			(890		)	57,973
Direct operating expenses	—			7,138			1,206			—			8,344
Selling, general and administrative expenses	—			5,157			—			—			5,157
Equity compensation expense	—			392			—			—			392
Depreciation, amortization and accretion expense	—			7,465			415			—			7,880
Total operating expenses	—			67,513			13,123			(890		)	79,746
Operating (loss) income	—			(1,649		)	1,439			—			(210		)
Other income (expense):
(Loss) earnings from consolidated affiliates	(2,731		)	1,249			—			1,482			—
Interest expense	—			(2,636		)	—			—			(2,636		)
Net (loss) income before income tax benefit	(2,731		)	(3,036		)	1,439			1,482			(2,846		)
Income tax benefit	—			214			—			—			214
Net (loss) income from continuing operations	(2,731		)	(2,822		)	1,439			1,482			(2,632		)
Discontinued operations	—			91			—			—			91
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
	Three months ended September 30, 2012
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Revenue	$	—		$	39,346		$	15,371		$	(370	)	$	54,347
Loss on commodity derivatives, net	—			(946		)	—			—			(946		)
Total revenue	—			38,400			15,371			(370		)	53,401
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			30,194			11,541			(370		)	41,365
Direct operating expenses	—			4,351			978			—			5,329
Selling, general and administrative expenses	—			3,150			96			—			3,246
Equity compensation expense	—			474			—			—			474
Depreciation, amortization and accretion expense	—			5,102			402			—			5,504
Total operating expenses	—			43,271			13,017			(370		)	55,918
Gain on sale of assets, net	—			4			—			—			4
Operating (loss) income	—			(4,867		)	2,354			—			(2,513		)
Other income (expense):
(Loss) earnings from consolidated affiliates	(4,275		)	2,105			—			2,170			—
Interest expense	—			(1,501		)	—			—			(1,501		)
Net (loss) income from continuing operations	(4,275		)	(4,263		)	2,354			2,170			(4,014		)
Discontinued operations	—			(12		)	—			—			(12		)
Net (loss) income	(4,275		)	(4,275		)	2,354			2,170			(4,026		)
Net income attributable to noncontrolling interests	—			—			249			—			249
Net (loss) income attributable to the Partnership	$	(4,275	)	$	(4,275	)	$	2,105		$	2,170		$	(4,275	)
	Condensed Consolidating Statements of Operations
	Nine months ended September 30, 2013
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Revenue	$	—		$	179,059		$	41,818		$	(4,361	)	$	216,516
Gains on commodity derivatives, net	—			110			—			—			110
Total revenue	—			179,169			41,818			(4,361		)	216,626
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			134,041			32,991			(4,361		)	162,671
Direct operating expenses	—			17,490			3,408			—			20,898
Selling, general and administrative expenses	—			13,748			—			—			13,748
Equity compensation expense	—			1,877			—			—			1,877
Depreciation, amortization and accretion expense	—			21,028			1,243			—			22,271
Total operating expenses	—			188,184			37,642			(4,361		)	221,465
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	—			(23,904		)	4,176			—			(19,728		)
Other income (expense):
(Loss) earnings from consolidated affiliates	(28,396		)	3,643			—			24,753			—
Interest expense	—			(6,958		)	—			—			(6,958		)
Net (loss) income before income tax benefit	(28,396		)	(27,219		)	4,176			24,753			(26,686		)
Income tax benefit	—			589			—			—			589
Net (loss) income from continuing operations	(28,396		)	(26,630		)	4,176			24,753			(26,097		)
Discontinued operations	—			(1,766		)	—			—			(1,766		)
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 Operations
	Nine months ended September 30, 2012
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Revenue	$	—		$	123,422		$	15,371		$	(370	)	$	138,423
Gain on commodity derivatives, net	—			3,157			—			—			3,157
Total revenue	—			126,579			15,371			(370		)	141,580
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			88,904			11,541			(370		)	100,075
Direct operating expenses	—			10,572			978			—			11,550
Selling, general and administrative expenses	—			10,005			96			—			10,101
Equity compensation expense	—			1,272			—			—			1,272
Depreciation, amortization and accretion expense	—			15,320			402			—			15,722
Total operating expenses	—			126,073			13,017			(370		)	138,720
Gain on sale of assets, net	—			121			—			—			121
Operating income	—			627			2,354			—			2,981
Other income (expense):
(Loss) earnings from consolidated affiliates	(257		)	2,105			—			(1,848		)	—
Interest expense	—			(3,083		)	—			—			(3,083		)
Net (loss) income from continuing operations	(257		)	(351		)	2,354			(1,848		)	(102		)
Discontinued operations	—			94			—			—			94
Net (loss) income	(257		)	(257		)	2,354			(1,848		)	(8		)
Net income attributable to noncontrolling interests	—			—			249			—			249
Net (loss) income attributable to the Partnership	$	(257	)	$	(257	)	$	2,105		$	(1,848	)	$	(257	)
	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
	Three months ended September 30, 2012
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Net (loss) income	$	(4,275	)	$	(4,275	)	$	2,354		$	2,170		$	(4,026	)
Unrealized gain on post retirement benefit plan assets and liabilities	23			23			—			(23		)	23
Comprehensive (loss) income	(4,252		)	(4,252		)	2,354			2,147			(4,003		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			249			—			249
Comprehensive (loss) income attributable to the Partnership	$	(4,252	)	$	(4,252	)	$	2,105		$	2,147		$	(4,252	)
	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 Comprehensive Income
	Nine months ended September 30, 2012
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Net (loss) income	$	(257	)	$	(257	)	$	2,354		$	(1,848	)	$	(8	)
Unrealized gain on post retirement benefit plan assets and liabilities	40			40			—			(40		)	40
Comprehensive (loss) income	(217		)	(217		)	2,354			(1,888		)	32
Less: Comprehensive income attributable to noncontrolling interests	—			—			249			—			249
Comprehensive (loss) income attributable to the Partnership	$	(217	)	$	(217	)	$	2,105		$	(1,888	)	$	(217	)
	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		)
Proceeds from property damage insurance recoveries	—			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		)
Payments for 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 increase 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	$	—		$	5,051		$	—		$	—		$	5,051
Supplemental non-cash information
Decrease in accrued property, plant and equipment	$	—		$	(6,080	)	$	—		$	—		$	(6,080	)
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	$	59,995		$	—		$	—		$	—		$	59,995
Net assets contributed	$	22,129		$	—		$	—		$	—		$	22,129
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
	Revised Condensed Consolidating Statements of Cash Flows
	Nine months ended September 30, 2012
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Net cash provided by operating activities	$	—		$	14,122		$	2,354		—			16,476
Cash flows from investing activities
Cost of acquisition, net of cash acquired	—			(51,377		)	—			—			(51,377		)
Additions to property, plant and equipment	—			(4,196		)	(269		)	—			(4,465		)
Proceeds from disposal of property, plant and equipment	—			126			—			—			126
Net contributions from affiliates	12,050			—			—			(12,050		)	—
Net distributions to affiliates	(13		)	—			—			13			—
Net cash provided by (used in) investing activities	12,037			(55,447		)	(269		)	(12,037		)	(55,716		)
Cash flows from financing activities
Net contributions from affiliates	—			13			—			(13		)	—
Net distributions to affiliates	—			(10,214		)	(1,836		)	12,050			—
Unit holder contributions	13			—			—			—			13
Unit holder distributions	(12,050		)	—			—			—			(12,050		)
Net distributions to noncontrolling interest owners	—			—			(249		)	—			(249		)
LTIP tax netting unit repurchase	—			(88		)	—			—			(88		)
Payments for deferred debt issuance costs	—			(1,140		)	—			—			(1,140		)
Payments on long-term debt	—			(42,310		)	—			—			(42,310		)
Borrowings on long-term debt	—			94,690			—			—			94,690
Net cash (used in) provided by financing activities	(12,037		)	40,951			(2,085		)	12,037			38,866
Net decrease in cash and cash equivalents	—			(374		)	—			—			(374		)
Cash and cash equivalents
Beginning of period	1			870			—			—			871
End of period	$	1		$	496		$	—		$	—		$	497
Supplemental cash flow information
Interest payments	$	—		$	1,894		—			—			1,894
Supplemental non-cash information
Increase in accrued property, plant and equipment	$	—		$	808		$	—		$	—		$	808
We corrected a classification error in the previously presented subsidiary guarantor statements of cash flows for the nine months ended September 30, 2012 in this Form 10-Q related to net distributions to affiliates within Guarantor Subsidiaries and Non-Guarantor Subsidiary of $10.2 million and $1.8 million, respectively, presented in net cash used in investing activities which is now presented as net distributions to affiliates within Guarantor Subsidiaries and Non-Guarantor Subsidiary of $10.2 million and $1.8 million, respectively in net cash provided by financing activities. This classification error has no impact to the consolidated financial statements.

Liquidity

Liquidity	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Liquidity	'
	Liquidity
	We are required to comply with certain financial covenants and ratios in our credit facility. As of December 31, 2012, the Consolidated Total Leverage Ratio, one of the primary financial covenants that we are required to maintain under our credit facility, was not to exceed 4.50 times. At December 31, 2012, our total indebtedness was approximately $130.9 million, which caused our Consolidated Total Leverage Ratio to be approximately 5.70 to 1.00. As a result, on December 26, 2012, the Partnership entered into the Third Amendment. The Third Amendment provided for a waiver of the Partnership's compliance with the Consolidated Total Leverage Ratio with respect to the quarter ended December 31, 2012 and for one month thereafter. The Third Amendment also requires the Partnership to provide certain financial and operating information of the Partnership on a monthly basis for 2013 and for any month after 2013 in which the Consolidated Total Leverage Ratio of the Partnership is in excess of 4.00 to 1.00. The remaining material terms and conditions of the senior secured revolving credit facility, including pricing, maturity and covenants, remained unchanged by the Third Amendment.
	On January 24, 2013, the Partnership entered into the second waiver to the credit facility that extended the waiver period with respect to the Consolidated Total Leverage Ratio to March 31, 2013 (and subsequently extended to April 16, 2013). Additional covenants during the waiver period included i) total outstanding borrowings under the credit facility shall not exceed $150.0 million; ii) restrictions on certain acquisitions; iii) an increase to the Eurodollar rate by 0.50%; iv) additional fees of 0.125% of the principal amount on each of February 28, 2013 and March 31, 2013; and v) execution of a compliance certificate.
	On April 15, 2013, we repaid approximately $12.5 million in outstanding borrowings under the credit agreement and entered into the Fourth Amendment in connection with the ArcLight Transaction. As a result, we had approximately $130 million of outstanding borrowings as of April 15, 2013 and approximately $45 million of available borrowing capacity as a result of the reduction of our borrowing capacity to a total of $175 million as described below. After the Fourth Amendment and until the quarter ended June 30, 2013, we were not required to meet a Consolidated Total Leverage Ratio under our credit facility.
	On September 30, 2013, we received $12.5 million from HPIP which was used to repay outstanding borrowings under the credit agreement. Please see Note 12 "Partners' Capital" for more details.
	As of October 31, 2013, we had approximately $129.2 million of outstanding borrowings and approximately $33.7 million of available borrowing capacity.
	The Fourth Amendment provided for the following:
	•	Permits the consummation of the ArcLight Transactions and the PIK Distribution according to the terms of the Amended Partnership Agreement are permitted;
	•	Commencing on October 1, 2013, the aggregate commitments of the lenders under the credit agreement will be reduced to $175 million if an equity contribution to the Partnership of $12.5 million that is used to repay borrowings under the credit facility by October 1, 2013 (which occurred on September 30, 2013);
	•	The total outstanding borrowings under the credit agreement are limited to $175 million until such equity contribution and debt repayment has occurred (which occurred on September 30, 2013), at which time the maximum permitted borrowings under the credit agreement will be raised to $200 million;
	•	The margins relating to our (i) Eurodollar-based loans range from 2.50% to 4.75% depending on the Consolidated Total Leverage ratio then in effect, and (ii) base rate loans range from 1.50% to 3.75%;
	•	The definition of Consolidated Total Indebtedness will not include the Series A Units or certain unsecured surety bonds relating to the High Point System;
	•	The definition of Consolidated EBITDA (the consolidated EBITDA for the quarters ended June 30 and September 30, 2013 will be annualized for purposes of the Consolidated Total Leverage Ratio) will:
	◦	include, on a pro forma basis, the consolidated EBITDA of the High Point System as if they were owned by the Partnership beginning on January 1, 2013;
	◦	exclude any insurance proceeds attributable to any event occurring prior to January 1, 2013; and
	◦	exclude any one-time, non-recurring transaction expenses of the Partnership incurred in connection with the ArcLight Transactions or the Fourth Amendment.
	•	During the period that commenced with the quarter ended March 31, 2013 and that ends with the quarter ended December 31, 2013, unless the Partnership has permanently canceled at least 20% of the number of subordinated units outstanding on April 15, 2013 (which occurred through the Equity Restructuring), the Partnership must reduce any quarterly cash distribution on either its subordinated units or Series A Units (at the Partnership's election) by an aggregate of $0.4 million per quarter, and such reduction may not be replaced by in-kind distributions of Partnership securities;
	•	The maximum Consolidated Total Leverage Ratio permitted as of the end of any fiscal quarter cannot exceed the ratio set forth below:
	Fiscal Quarter Ended	Consolidated Total Leverage Ratio
	June 30, 2013	5.90:1.00
	September 30, 2013	5.90:1.00
	December 31, 2013	5.75:1.00
	March 31, 2014	5.75:1.00
	June 30, 2014	5.75:1.00
	September 30, 2014	5.50:1.00
	December 31, 2014	5.25:1.00
	March 31, 2015 and each fiscal quarter thereafter	4.50:1.00
	•	The Partnership agrees to cooperate with and pay the fees and expenses incurred by Bank of America, N.A., the administrative agent for the credit agreement, in connection with its engagement of FTI Consulting to advise and assist it in an assessment of the Partnership's financial condition; and
	•	The lenders permanently waived the Partnership's failure to comply with covenants relating to the Partnership's Consolidated Total Leverage Ratio for the quarters ended December 31, 2012 and March 31, 2013.
	The Partnership believes that the consummation of the ArcLight Transactions and Equity Restructuring will allow it to comply with the Consolidated Total Leverage to EBITDA ratio in the Fourth Amendment. However, while we were in compliance with financial covenants of the Fourth Amendment as of September 30, 2013, no assurances can be given that the Partnership's future results of operations will allow us to comply with financial covenants of the Fourth Amendment. If we are not able to generate sufficient cash flows from operations to comply with the financial covenants in the Fourth Amendment and we are not able enter into an agreement to refinance or obtain covenant default waivers, then the outstanding balance under our credit facility could become due and payable upon acceleration by the lenders in our banking group and other agreements with cross-default provisions, if any, could become due. In addition, failure to comply with any of the covenants under our Fourth Amendment could adversely affect our ability to fund ongoing operations and growth capital requirements as well as our ability to pay distributions to our unitholders.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	Distribution
	On October 25, 2013, we announced a distribution of $0.4525 per unit for the quarter ended September 30, 2013, or $1.81 per unit on an annualized basis, payable on November 14, 2013 to unitholders of record on November 7, 2013.
	Amendment to Partnership Agreement
	Effective as of October 28, 2013, we entered into the First Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of American Midstream Partners, LP (“Fourth Amended and Restated Partnership Agreement”) to clarify that only those Unitholders holding Common Units (and not those Unitholders holding Series A Preferred Units) are entitled to receive a distribution of remaining Available Cash from Operating Surplus pursuant to Section 6.4(b)(iii)(C) of Fourth Amended and Restated Partnership Agreement (as each term is defined in the Fourth Amended and Restated Partnership Agreement).
	Blackwater acquisition
	On October 7, 2013, Blackwater entered into a $12 million term note with a maturity date of December 31, 2013, as well as amendments to their credit agreement. Also on October 7, 2013, Blackwater entered into a $30 million one-year credit agreement with Barclays bank. As part of the Blackwater acquisition these amounts were settled in full and not acquired.
	On December 11, 2013, the Partnership and certain of its affiliates entered into an underwriting agreement (the “Underwriting Agreement”) with Barclays Capital Inc. (the “Underwriter”), providing for the issuance and sale by the Partnership, and the purchase by the Underwriter, of 2,400,000 common units representing limited partner interests in the Partnership (the “Common Units”) at a price to the public of $22.47 per Common Unit (the “Offering”). The Offering of the Common Units was registered under the Securities Act of 1933, as amended (the “Securities Act”), pursuant to a Registration Statement on Form S-3 (Registration No. 333-183818) (the “Registration Statement”) filed with the Securities and Exchange Commission (the “Commission”) that became effective on November 27, 2013, as supplemented by a Prospectus Supplement dated December 13, 2013, as filed with the Commission on December 13, 2013, pursuant to Rule 424(b)(2) of the Securities Act. Pursuant to the Underwriting Agreement, the Partnership granted the Underwriter a 30-day option to purchase up to an additional 360,000 Common Units on the same terms as those relating to the Common Units sold by the Partnership in the Offering. The Partnership used the net proceeds of the Offering to fund a portion of the $60 million purchase price for Blackwater.
	Effective December 17, 2013, the Partnership completed the Merger of Blackwater, an owner, developer and operator of petroleum, agricultural, and chemical liquid terminal storage facilities.

Goodwill_and_intangible_assets

Goodwill and intangible assets Goodwill and intangible assets (Notes)	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets Disclosure [Text Block]	'
	Goodwill of $16.4 million was contributed to the Partnership as part of the Blackwater acquisition. Goodwill is not amortized and is assessed for impairment annually or more frequently if an event or circumstance indicates that an impairment may have occurred. Goodwill was recorded as a result of the excess of the investment by ArcLight in Blackwater over the fair market value of the identifiable net assets and customer contracts acquired in 2012 and offset to the calculated deferred tax benefit amount as of March 31, 2013.
	Intangible assets, net, consist of customer contracts contributed to the Partnership as part of the Blackwater acquisition. The intangible assets are amortized on a straight-line basis over the economic lives of the customer contracts, currently ranging from 5 months to thirty-five months. Intangible assets, net, consist of the following as of September 30, 2013 (in thousands):
		30-Sep-13
	Customer contracts	$	12,082
	Accumulated amortization	(7,731		)
	Intangible assets, net	$	4,351
	Amortization expense was $1.2 million and $3.0 million for the three and nine months ended September 30, 2013, respectively.

Discontinued_Operations_Notes

Discontinued Operations (Notes)	9 Months Ended
	Sep. 30, 2013
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. As of September 30, 2013, certain gathering and processing assets were written down by $1.8 million to the estimated fair value less cost to sell. 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. Primarily using the income approach, the fair value estimates are based on i) present value of estimated EBITDA, ii) an assumed discount rate of 10.0%, and iii) a decline in throughput volumes of 2.5% in 2013 and thereafter.
	As part of the Merger with Blackwater, we acquired long-lived terminal assets classified as held for sale. The net book value of the assets and liabilities attributable to those assets are presented separately on the condensed consolidated balance sheet and comprise $0.1 million of Current assets held for sale, $2.1 million of Noncurrent assets held for sale, net, $0.4 million of Current liabilities held for sale and the entire balance of Long-term liabilities held for sale as of September 30, 2013.
	The net book value of the gathering and processing assets of $0.9 million is presented as Noncurrent assets held for sale, net on the condensed consolidated balance sheet. Other assets and liabilities of the held for sale assets are presented within Current assets held for sale and Current liabilities held for sale on the Condensed consolidated balance sheet.
	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 Income (loss) from operations of disposal groups 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, expense and (loss) gain from operations of disposal groups associated with the assets classified as held for sale for the three and nine months ended September 30, 2013 and 2012 (in thousands):
		Three months ended September 30,					Nine months ended September 30,
		2013		2012			2013			2012
	Revenue	$	3,800	$	2,923		$	11,395		$	8,515
	Expense	3,709		2,935			11,354			8,421
	Impairment	—		—			1,807			—
	Income (loss) from operations of disposal groups	$	91	$	(12	)	$	(1,766	)	$	94
	Limited partners' net income (loss) per unit from discontinued operations (basic and diluted)	$	0.02	$	—		$	(0.19	)	$	0.01

Income_Tax_Notes

Income Tax (Notes)	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	The provision for taxes is only attributable to the activities of certain affiliates of Blackwater. The details of the provision for taxes on income for the three and nine months ended September 30, 2013 are as follows (in thousands):
		Three months ended September 30, 2013			Nine months ended September 30, 2013
	Federal income tax benefit at statutory rate	$	143		$	446
	State and local tax benefit	21			66
	Income not subject to corporate-level tax	85			152
	Other	(1		)	(2		)
	Income tax benefit	247			662
	Tax provision from discontinued operations	(34		)	(73		)
	Income tax benefit from continuing operations	$	214		$	589
	The income tax provision related to continuing operations consist of the following (in thousands):
		Three months ended September 30, 2013			Nine months ended September 30, 2013
	Current income tax	$	—		$	—
	Deferred income tax benefit	214			589
	Effective income tax rate	64		%	52		%
	The effective tax rates for the periods ended September 30, 2013 were greater than the statutory rate due to the inclusion in the financial statements of income of the parent company, which is not taxed at the corporate level.

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2013
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 acquiring and operating certain natural gas pipeline and processing businesses. 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 eleven gathering systems, four processing facilities, three interstate pipelines and five intrastate pipelines. We also own a 50% undivided, non-operating interest in a processing plant located in southern Louisiana. We hold our assets in a series of wholly owned limited liability companies as well as a limited partnership. Our capital accounts consist of general partner interests and limited partner interests.
	Our interstate and intrastate natural gas pipeline assets transport natural gas through the FERC regulated natural gas pipelines in Louisiana, Mississippi, Alabama and Tennessee. Our interstate and intrastate 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; and
	•	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.
	ArcLight Transactions
	On April 15, 2013, the Partnership, American Midstream GP, LLC, (our "General Partner") and AIM Midstream Holdings, LLC ("AIM"), an affiliate of American Infrastructure MLP Fund, entered into agreements (the "ArcLight Transactions") with High Point Infrastructure Partners, LLC ("HPIP"), an affiliate of ArcLight Capital Partners, LLC, pursuant to which HPIP (i) acquired 90% of our General Partner and all of our subordinated units from AIM and (ii) contributed certain midstream assets and $15.0 million in cash to us in exchange for 5,142,857 newly issued convertible preferred units (the “Series A Units”) issued by the Partnership. Of the $15.0 million cash consideration paid by HPIP, approximately $2.5 million was used to pay certain transaction expenses of HPIP, and the remaining approximately $12.5 million was used to repay borrowings outstanding under the Partnership's credit facility in connection with the Fourth Amendment to our credit agreement ("Fourth Amendment"). As a result of these transactions, which were also consummated on April 15, 2013, HPIP acquired both control of our General Partner and a majority of our outstanding limited partner interests. The midstream assets contributed by HPIP consist of approximately 700 miles of natural gas and liquids pipeline assets located in southeast Louisiana and the shallow water and deep shelf Gulf of Mexico (commonly referred to as the "High Point System"). The High Point System gathers natural gas from both onshore and offshore producing regions around southeast Louisiana. The onshore footprint is in Plaquemines and St. Bernard's Parishes, LA. The offshore footprint consists of the following federal Gulf of Mexico zones: Mississippi Canyon, Viosca Knoll, West Delta, Main Pass, South Pass and Breton Sound. Natural gas is collected at more than 75 receipt points that connect to hundreds of wells targeting various geological zones in water depths up to 1,000 feet, with an emphasis on oil and liquids-rich reservoirs. The High Point System is comprised of FERC-regulated transmission assets and non-jurisdictional assets, both of which accept natural gas from well production and interconnected pipeline systems. Natural gas is delivered to the Toca Gas Processing Plant, operated by Enterprise, where the products are processed and the residue gas sent to an unaffiliated interstate system owned by Kinder Morgan. See Note 3 "Acquisitions" for further information.
	The Partnership believes that the consummation of the ArcLight Transactions will allow it to comply with the Consolidated Total Leverage to EBITDA ratio in the Fourth Amendment. However, while we were in compliance with financial covenants of the Fourth Amendment as of September 30, 2013, no assurances can be given that the Partnership's future results of operations will allow us to comply with financial covenants of the Fourth Amendment. If we are not able to generate sufficient cash flows from operations to comply with the financial covenants in the Fourth Amendment and we are not able to enter into an agreement to refinance or obtain covenant default waivers, then the outstanding balance under our credit facility could become due and payable upon acceleration by the lenders in our banking group and other agreements with cross-default provisions, if any, could become due. In addition, failure to comply with any of the covenants under our Fourth Amendment could adversely affect our ability to fund ongoing operations and growth capital requirements as well as our ability to pay distributions to our unitholders. See Note 20 "Liquidity" for further information.
	Equity Restructuring
	Effective August 9, 2013, we executed an equity restructuring agreement ("Equity Restructuring") with our General Partner and HPIP. As part of the Equity Restructuring, the Partnership's 4,526,066 subordinated units and previous incentive distribution rights (the “former IDRs,” all of which were owned by our General Partner, which is controlled by HPIP) were combined into and restructured as a new class of incentive distribution rights (the “new IDRs”). Upon the issuance of the new IDRs, the subordinated units and former IDRs were canceled. The new IDRs are allocated 85.02% to HPIP and 14.98% to our General Partner. The new IDRs entitle the holders of our incentive distribution rights to receive 48% of any quarterly cash distributions from available cash after the Partnership's common unitholders have received the full minimum quarterly distribution ($0.4125 per unit) for each quarter plus any arrearages from prior quarters (of which there are currently none).
	The Equity Restructuring Agreement also provided for the issuance of warrants to our General Partner to purchase up to 300,000 of our common units at an exercise price of $0.01 per common unit. These warrants are exercisable on the later of (i) 18 months from the equity restructuring completion date or (ii) the date that the volume weighted average trading price of our common units on the New York Stock Exchange exceeds $25.00 for 30 consecutive trading days. The warrants contain customary anti-dilution and other protections.
	Following the announcement of the Equity Restructuring, AIM Midstream Holdings, LLC, or AIM filed an action in Delaware Chancery Court against HPIP, our General Partner and us seeking either rescission of the Equity Restructuring or, in the alternative, monetary damages. While we cannot predict the ultimate outcome of this litigation, we do not believe it will be material to our operations or financial results. As a result of the action filed by AIM, the warrants that were issued by the Partnership, in conjunction with the Equity Restructuring, to the General Partner for subsequent conveyance to AIM, the owner of the Class B interest of our General Partner, were canceled effective August 29, 2013. In addition, the $12.5 million escrowed in connection with our Equity Restructuring was not released to the Partnership. Accordingly, HPIP contributed $12.5 million in cash to the Partnership on September 30, 2013, in order to permit the Partnership to satisfy obligations under our credit agreement and was accounted for as a contribution from our General Partner.
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 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 as of September 30, 2013, and December 31, 2012, condensed consolidated statement of operations for the three and nine months ended September 30, 2013 and 2012, statement of comprehensive income for the three and nine months ended September 30, 2013 and 2012, statement of changes in partners’ capital and noncontrolling interest for the nine months ended September 30, 2013 and 2012, and statements of cash flows for the nine months ended September 30, 2013 and 2012.
	Our financial results for the nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the full year ended December 31, 2013. 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, 2012 (“Annual Report”) filed on April 16, 2013 and ii) Exhibit 99.1 to the Current Report on Form 8-K that was filed with the Securities and Exchange Commission ("SEC") on October 1, 2013 which updated portions of our annual report.
	Effective December 17, 2013, Blackwater was acquired by the Partnership, in the form of the Merger described above, from ArcLight. However, as of April 15, 2013, an affiliate of ArcLight acquired controlling interest of the Partnership, also described above, at which time Blackwater was also an affiliate of ArcLight. As Blackwater and the Partnership were both affiliates of ArcLight as of April 15, 2013, these financial statements include the effect of Blackwater's operations starting as of the date of the establishment of common control. Therefore, these condensed consolidated financial statements include Blackwater, which have a fiscal year end of March 31, 2013, and were presented from the period April 15, 2013 through September 30, 2013. Please see Note 18 "Reporting Segments" for financial information of Blackwater as presented in our Terminals segment.
Consolidation Policy	'
	Consolidation Policy
	Our 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 consolidated financial statements reflect our proportionate share of the revenues, expenses, assets and liabilities of this undivided interest. In July 2012, the Partnership acquired a 87.4% undivided interest in the Chatom Processing and Fractionation facility (the "Chatom System"). Our consolidated financial statements reflect the accounts of the Chatom System since acquisition, and the interests in the Chatom System held by non-affiliated working interest owners are reflected as noncontrolling interests in the Partnership's consolidated financial statements.
Use of Estimates	'
	Use of Estimates
	When preparing 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, product 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 (Tables)	9 Months Ended
	Sep. 30, 2013
Business Acquisition, Pro Forma Information [Abstract]	'
Schedule of Assets and Liabilities Acquired Under Common Control [Table Text Block]	'
	The contribution is being treated as a transaction between entities under common control, under which the net assets received are recorded at their historical book value as of date of transfer. The following table presents the carrying value of the identified assets received and liabilities assumed at the acquisition date (in thousands):
	Cash and cash equivalents	$	1,935
	Accounts receivable	3,629
	Unbilled revenue	1,446
	Other current assets	2,049
	Property, plant and equipment, net	82,615
	Other assets	1,000
	Accounts payable	(11		)
	Accrued expenses and other current liabilities	(4,077		)
	Current portion of long-term debt	(893		)
	Asset retirement obligation liability	(25,763		)
	Total identifiable net assets	$	61,930
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	'
	The following table presents the fair value of consideration transferred to acquire the Chatom System and the amounts of identified assets acquired and liabilities assumed at the acquisition date, as well as the fair value of the 12.6% noncontrolling interest in the Chatom System at the acquisition date (in thousands):
	Cash			$	51,377
	Recognized amounts of identifiable assets acquired and liabilities assumed:
	Unbilled revenue			$	4,535
	Property, plant and equipment			58,279
	Asset retirement cost			452
	Accounts payable			(399		)
	Accrued gas purchases			(3,631		)
	Asset retirement obligations			(452		)
	Noncontrolling interest			(7,407		)
	Total identifiable net assets			$	51,377
Business Acquisition, Pro Forma Information [Table Text Block]	'
	The following table presents unaudited pro forma consolidated information of the Partnership, adjusted for the acquisition of the Chatom System, as if the acquisition had occurred on January 1, 2011:
	(unaudited, in thousands)	Nine months ended September 30, 2012
	Revenue	$	174,179
	Net income	$	1,422
	Limited partners’ net income per unit	$	0.14

Concentration_of_Credit_Risk_a1

Concentration of Credit Risk and Trade Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2013
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 consolidated statement of operations for the each of the periods presented below:
		Three months ended September 30,				Nine months ended September 30,
		2013		2012		2013		2012
	Customer A	26	%	23	%	28	%	29	%
	Customer B	13	%	17	%	13	%	—	%
	Customer C	12	%	11	%	12	%	12	%
	Customer D	—	%	12	%	—	%	16	%
	Other	49	%	37	%	47	%	43	%
	Total	100	%	100	%	100	%	100	%

Derivatives_Tables

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair value associated with commodity derivative instruments	'
	As of September 30, 2013 and December 31, 2012, the value associated with our commodity derivatives, interest rate swap instrument 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, 2013			December 31, 2012			September 30, 2013				December 31, 2012			September 30, 2013			December 31, 2012
	Current		$	1,196		$	1,889		$	(146	)		$	(920	)	$	1,050		$	969
	Noncurrent		—			—			—				—			—			—
	Total assets		$	1,196		$	1,889		$	(146	)		$	(920	)	$	1,050		$	969
	Current		$	—		$	—		$	(349	)		$	—		$	(349	)	$	—
	Noncurrent		—			—			(122		)		—			(122		)	—
	Total liabilities		$	—		$	—		$	(471	)		$	—		$	(471	)	$	—
Realized and unrealized gains (losses) with commodity and interst rate derivative instruments	'
	For the three and nine months ended September 30, 2013 and 2012, 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
	2013
	Gain (loss) on commodity derivatives, net	$	261		$	(760	)	$	797			$	(687	)
	Interest expense	(101		)	(153		)	(101		)		(471		)
	Direct operating expenses	(284		)	—			(378		)		—
	Total	$	(124	)	$	(913	)	$	318			$	(1,158	)
	2012
	Gain (loss) on commodity derivatives, net	$	816		$	(1,762	)	$	1,425			$	1,732

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2013
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 balance sheet, that were measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 (in thousands):
		Carrying			Estimated Fair Value
		Amount			Level 1		Level 2			Level 3		Total
	Commodity derivative instruments, net
	September 30, 2013	$	294		$	—	$	294		$	—	$	294
	31-Dec-12	$	969		$	—	$	969		$	—	$	969
	Interest rate swap
	30-Sep-13	$	(472	)	$	—	$	(472	)	$	—	$	(472	)
	31-Dec-12	$	—		$	—	$	—		$	—	$	—

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Property, plant and equipment, net	'
	Property, plant and equipment, net, as of September 30, 2013 and December 31, 2012 were as follows (in thousands):
		Useful Life	September 30,			December 31, 2012
		(in years)	2013
	Land	N/A	$	6,068		$	2,254
	Construction in progress	N/A	5,949			5,053
	Base gas	N/A	1,108			—
	Buildings and improvements	4 to 40	3,537			1,432
	Processing and treating plants	8 to 40	98,819			98,106
	Pipelines	5 to 40	236,450			163,447
	Compressors	4 to 20	11,278			8,957
	Dock	20 to 40	7,942			—
	Tanks, truck rack and piping	20 to 40	22,353			—
	Equipment	8 to 20	5,875			4,785
	Computer software	5	2,566			1,950
	Total property, plant and equipment		401,945			285,984
	Accumulated depreciation		(85,290		)	(62,165		)
	Property, plant and equipment, net		$	316,655		$	223,819

Asset_Retirement_Obligation_Ta

Asset Retirement Obligation (Tables)	9 Months Ended
	Sep. 30, 2013
Asset Retirement Obligation Disclosure [Abstract]	'
Schedule of reconciliation of the beginning and ending aggregate carrying amount of ARO liabilities	'
	The following table is a reconciliation of the asset retirement obligations (in thousands):
	Asset retirement obligation at December 31, 2012	$	8,319
	Obligations assumed	25,763
	Accretion expense	358
	Asset retirement obligation at September 30, 2013	$	34,440
	Total expenses related to operating leases, asset retirement obligations, land site leases and right-of-way agreements were (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Operating leases	$	357	$	254	$	841	$	692
	Asset retirement obligation	191		10		358		23
		$	548	$	264	$	1,199	$	715

Debt_Obligations_Tables

Debt Obligations (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Outstanding borrowings under the credit facility	'
	Our outstanding borrowings at September 30, 2013 and December 31, 2012, respectively, were as follows (in thousands):
		September 30,		December 31, 2012
		2013
	Revolving loan facility	$	121,035	$	128,285
	Other debt	157		—
	Loans associated with Blackwater:
	Note, prime plus 1.5% interest, issued October 2010 and due September 2014	1,174		—
	Term loan, 4.5% interest, issued February 2012 and due August 2017	1,104		—
	Term loan, JPM prime rate interest, issued June 2012 and due May 2018	2,477		—
	Term loan, JPM prime rate interest, issued March 2013 and due September 2018	1,348		—
	Convertible promissory note with affiliate, 10% interest, issued October 2012 and due October 2013	20,000		—
	Term loan, JPM prime rate interest, issued July 2013 and due July 2014	1,299		—
	Term loan, JPM prime rate interest, issued July 2013 and due July 2014	3,575		—
	Total debt	152,169		128,285
	Less: current portion of loans to affiliate	20,000		—
	Less: current portion of long-term debt	7,281		—
	Total debt net of current portion	$	124,888	$	128,285

Partners_Capital_Tables

Partners' Capital (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Numbers of units outstanding	'
	The numbers of units outstanding as of September 30, 2013 and December 31, 2012, respectively, were as follows (in thousands):
		September 30,			December 31, 2012
		2013
	Limited partner common units	4,705			4,639
	Limited partner subordinated units	—			4,526
	Series A Units	5,204			—
	General partner units	185			185
Schedule of Calulation for Net Income (Loss) Per Limited Partner Unit	'
	The following table is the calculation of net income (loss) per limited partner unit for the three and nine months ended September 30, 2013 and 2012, respectively (in thousands, with the exception of per unit amounts):
		Three months ended September 30,							Nine months ended September 30,
		2013				2012			2013			2012
	Net loss from continuing operations	$	(2,632	)		$	(4,014	)	$	(26,097	)	$	(102	)
	Net income attributable to noncontrolling interests	$	190			$	249		$	533		$	249
	Net loss from continuing operations attributable to the Partnership	$	(2,822	)		$	(4,263	)	$	(26,630	)	$	(351	)
	Less:
	Declared cash distributions on Series A Units	1,301				—			2,375			—
	Declared PIK distributions on Series A Units	1,572				—			2,912			—
	Fair value of Series A Units in excess of value of contributed High Point System	—				—			15,612			—
	General partner's distribution	80				80			240			241
	General partner's share in undistributed loss	(170		)		(166		)	(1,074		)	(248		)
	Blackwater net loss from continuing operations	(122		)		—			(536		)	—
	Net loss from continuing operations available to limited partners	$	(5,483	)		$	(4,177	)	$	(46,159	)	$	(344	)
	Net loss attributable to the Partnership	$	(2,731	)		$	(4,275	)	$	(28,396	)	$	(257	)
	Less:
	Declared cash distributions on Series A Units	1,301				—			2,375			—
	Declared PIK distributions on Series A Units	1,572				—			2,912			—
	Fair value of Series A Units in excess of value of contributed High Point System	—				—			15,612			—
	General partner's distribution	80				80			240			241
	General partner's share in undistributed loss	(167		)		(166		)	(1,102		)	(246		)
	Blackwater net loss	(175		)		—			(650		)	—
	Net loss available to limited partners	$	(5,342	)		$	(4,189	)	$	(47,783	)	$	(252	)
	Weighted average number of units used in computation of limited partners’ net (loss) income per unit (basic and diluted)	6,663				9,108			8,334			9,103
	Limited partners’ net loss from continuing operations per unit (basic and diluted)	$	(0.82	)		$	(0.46	)	$	(5.54	)	$	(0.04	)
	Limited partners’ net loss per unit (basic and diluted)	$	(0.80	)		$	(0.46	)	$	(5.73	)	$	(0.03	)

LongTerm_Incentive_Plan_Tables

Long-Term Incentive Plan (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Table summarizes our unit-based awards	'
	The following table summarizes our unit-based awards for each of the periods indicated, in units:
		Three Months Ended				Nine months ended
		September 30,				September 30,
		2013		2012		2013		2012
	Outstanding at beginning of period	96,733		172,551		90,938		162,860
	Granted	28,042		—		108,430		34,560
	Forfeited	(893	)	(12,517	)	(13,320	)	(12,517	)
	Vested	(24,482	)	—		(86,648	)	(24,869	)
	Outstanding at end of period	99,400		160,034		99,400		160,034
	Fair value per unit	$13.36 to $21.89		$14.70 to  $21.40		$13.36 to $21.89		$14.70 to  $21.40

PostEmployment_Benefits_Tables

Post-Employment Benefits (Tables)	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Cost recognized in Unaudited Condensed Consolidated Statements of Operations	'
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Service cost	$	1		$	1		$	3		3
	Interest cost	4			4			12			12
	Expected return on plan assets	(17		)	(16		)	(51		)	(49		)
	Amortization of net gain	(6		)	(9		)	(18		)	(27		)
	Net periodic benefit	$	(18	)	$	(20	)	$	(54	)	$	(61	)

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Future non-cancelable commitments related to certain contractual obligations	'
	Future non-cancelable commitments related to certain contractual obligations as of September 30, 2013 are presented below (in thousands):
		Payments Due by Period
		Total		2013		2014		2015		2016		2017		Thereafter
	Operating leases and service contracts (a)	$	4,282	$	154	$	793	$	762	$	531	$	506	$	1,536
	Asset retirement obligations	34,440		—		—		—		7,867		—		26,573
	Total	$	38,722	$	154	$	793	$	762	$	8,398	$	506	$	28,109
Total expenses related to operating leases, asset retirement obligations, land site leases and right-of-way agreements	'
	The following table is a reconciliation of the asset retirement obligations (in thousands):
	Asset retirement obligation at December 31, 2012	$	8,319
	Obligations assumed	25,763
	Accretion expense	358
	Asset retirement obligation at September 30, 2013	$	34,440
	Total expenses related to operating leases, asset retirement obligations, land site leases and right-of-way agreements were (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Operating leases	$	357	$	254	$	841	$	692
	Asset retirement obligation	191		10		358		23
		$	548	$	264	$	1,199	$	715

Reporting_Segments_Tables

Reporting Segments (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment information	'
	The following tables set forth our segment information for the three and nine months ended September 30, 2013 and 2012 (in thousands):
		Three months ended September 30,
		2013										2012
		Gathering			Transmission		Terminals		Total			Gathering			Transmission		Total
		and										and
		Processing										Processing
	Revenue	$	48,873		$	27,704	$	3,458	$	80,035		$	41,637		$	12,710	$	54,347
	Loss on commodity derivatives, net	(499		)	—		—		(499		)	(946		)	—		(946		)
	Total revenue	48,374			27,704		3,458		79,536			40,691			12,710		53,401
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	38,162			19,811		—		57,973			32,105			9,260		41,365
	Direct operating expenses	3,720			3,994		630		8,344			3,567			1,762		5,329
	Selling, general and administrative expenses								5,157								3,246
	Equity compensation expense								392								474
	Depreciation, amortization and accretion expense								7,880								5,504
	Total operating expenses								79,746								55,918
	Gain on sale of assets, net								—								4
	Operating loss								(210		)						(2,513		)
	Interest and other expense								(2,636		)						(1,501		)
	Net loss before income tax benefit								(2,846		)						(4,014		)
	Income tax benefit								214								—
	Net loss from continuing operations								(2,632		)						(4,014		)
	Gain (loss) on discontinued operations (a)								91								(12		)
	Net loss								(2,541		)						(4,026		)
	Less: Net income attributable to noncontrolling interests								190								249
	Net loss attributable to the Partnership								$	(2,731	)						$	(4,275	)
	Segment gross margin (b) (c)	$	10,688		$	7,864	$	2,828	$	21,380		$	10,310		$	2,668	$	12,978
		Nine months ended September 30,
		2013										2012
		Gathering			Transmission		Terminals		Total			Gathering			Transmission		Total
		and										and
		Processing										Processing
	Revenue	$	144,658		$	65,532	$	6,326	$	216,516		$	101,307		$	37,116	$	138,423
	Gain on commodity derivatives, net	110			—		—		110			3,157			—		3,157
	Total revenue	144,768			65,532		6,326		216,626			104,464			37,116		141,580
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	116,568			46,103		—		162,671			74,775			25,300		100,075
	Direct operating expenses	10,694			8,943		1,261		20,898			7,531			4,019		11,550
	Selling, general and administrative expenses								13,748								10,101
	Equity compensation expense								1,877								1,272
	Depreciation, amortization and accretion expense								22,271								15,722
	Total operating expenses								221,465								138,720
	Gain on involuntary conversion of property, plant and equipment								343								—
	Gain on sale of assets, net								—								121
	Loss on impairment of property, plant and equipment								(15,232		)						—
	Operating (loss) income								(19,728		)						2,981
	Interest and other expense								(6,958		)						(3,083		)
	Net loss before income tax benefit								(26,686		)						(102		)
	Income tax benefit								589								—
	Net loss from continuing operations								(26,097		)						(102		)
	(Loss) gain on discontinued operations (a)								(1,766		)						94
	Net loss								(27,863		)						(8		)
	Less: Net income attributable to noncontrolling interests								533								249
	Net loss attributable to the Partnership								$	(28,396	)						$	(257	)
	Segment gross margin (b) (c)	$	28,454		$	19,296	$	5,065	$	52,815		$	27,321		$	9,472	$	36,793
	(a)	Gain (loss) on discontinued operations impacts our Gathering and Processing Segment.
	(b)	Segment gross margin for our Gathering and Processing Segment consists of revenue, realized gain (loss) on commodity derivatives less construction, operating and maintenance agreement (“COMA”) income, less purchases of natural gas, NGLs and condensate. Segment gross margin for our Transmission Segment consists of revenue, less COMA income, less purchases of natural gas. 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. Effective October 1, 2012, we changed our segment gross margin measure to exclude COMA income. For the three months ended September 30, 2013 and 2012, $0.3 million and less than $0.1 million, respectively in COMA income was excluded from our Gathering and Processing segment gross margin and less than $0.1 million and $0.8 million, respectively, in COMA income was excluded from our Transmission Segment gross margin. For the nine months ended September 30, 2013 and 2012, $0.4 million and $0.6 million, respectively, in COMA income was excluded from our Gathering and Processing Segment gross margin and $0.1 million and $2.3 million, respectively, in COMA income was excluded from our Transmission segment gro

Subsidiary_Guarantors_Tables

Subsidiary Guarantors (Tables)	9 Months Ended
	Sep. 30, 2013
Subsidiary Guarantors [Abstract]	'
Schedule of Condensed Consolidating Balance Sheet	'
		Condensed Consolidating Balance Sheet
		30-Sep-13
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
	Assets
	Current assets
	Cash and cash equivalents	$	1		$	3,472		$	—		$	—		$	3,473
	Accounts receivable	—			4,144			1,502			—			5,646
	Unbilled revenue	—			20,107			3,649			—			23,756
	Risk management assets	—			1,050			—			—			1,050
	Other current assets	—			4,753			473			—			5,226
	Current assets held for sale	—			1,276			—			—			1,276
	Total current assets	1			34,802			5,624			—			40,427
	Property, plant and equipment, net	—			257,864			58,791			—			316,655
	Noncurrent assets held for sale, net	—			3,016			—			—			3,016
	Intangible assets, net	—			4,351			—			—			4,351
	Goodwill	—			16,447			—			—			16,447
	Deferred tax asset	—			5,741			—			—			5,741
	Investment in subsidiaries	149,782			53,607			—			(203,389		)	—
	Other assets, net	—			6,202			—			—			6,202
	Total assets	$	149,783		$	382,030		$	64,415		$	(203,389	)	$	392,839
	Liabilities, Equity and Partners’ Capital
	Current liabilities
	Accounts payable	$	—		$	2,038		$	210		$	—		$	2,248
	Accrued gas purchases	—			13,706			2,614			—			16,320
	Accrued expenses and other current liabilities	856			16,576			116			—			17,548
	Risk management liabilities	—			349			—			—			349
	Current portion of long-term debt	—			7,281			—			—			7,281
	Current portion of loans to affiliate	—			20,000			—			—			20,000
	Current liabilities held for sale	—			1,355			—			—			1,355
	Total current liabilities	856			61,305			2,940			—			65,101
	Risk management liabilities	—			122			—			—			122
	Assets retirement obligations	—			33,972			468			—			34,440
	Other liabilities	—			215			—			—			215
	Long-term debt	—			124,888			—			—			124,888
	Deferred tax liability	—			10,760			—			—			10,760
	Long-term liabilities held for sale	—			986			—			—			986
	Total liabilities	856			232,248			3,408			—			236,512
	Convertible preferred units	92,912			—			—			—			92,912
	Total partners' capital	56,015			149,782			53,607			(203,389		)	56,015
	Noncontrolling interest	—			—			7,400			—			7,400
	Total equity and partners' capital	56,015			149,782			61,007			(203,389		)	63,415
	Total liabilities, equity and partners' capital	$	149,783		$	382,030		$	64,415		$	(203,389	)	$	392,839
		Condensed Consolidating Balance Sheet
		31-Dec-12
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
	Assets
	Current assets
	Cash and cash equivalents	$	1		$	575		$	—		$	—		$	576
	Accounts receivable	—			1,612			346			—			1,958
	Unbilled revenue	—			18,102			3,410			—			21,512
	Risk management assets	—			969			—			—			969
	Other current assets	—			2,967			259			—			3,226
	Total current assets	1			24,225			4,015			—			28,241
	Property, plant and equipment, net	—			165,001			58,818			—			223,819
	Investment in subsidiaries	80,164			51,613			—			(131,777		)	—
	Other assets, net	—			4,636			—			—			4,636
	Total assets	$	80,165		$	245,475		$	62,833		$	(131,777	)	$	256,696
	Liabilities, Equity and Partners’ Capital
	Current liabilities
	Accounts payable	$	—		$	5,100		$	427		$	—		$	5,527
	Accrued gas purchases	—			14,606			2,428			—			17,034
	Accrued expenses and other current liabilities	—			9,150			469			—			9,619
	Total current liabilities	—			28,856			3,324			—			32,180
Asset retirement obligations	—			7,861			458			—			8,319
Other liabilities	—			309			—			—			309
Long-term debt	—			128,285			—			—			128,285
Total liabilities	—			165,311			3,782			—			169,093
Total partners' capital	80,165			80,164			51,613			(131,777		)	80,165
Noncontrolling interest	—			—			7,438			—			7,438
Total equity and partners' capital	80,165			80,164			59,051			(131,777		)	87,603
Total liabilities, equity and partners' capital	$	80,165		$	245,475		$	62,833		$	(131,777	)	$	256,696
Schedule of Condensed Consolidating Statements of Operations	'
		Condensed Consolidating Statements of Operations
		Three months ended September 30, 2013
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
	Revenue	$	—		$	66,363		$	14,562		$	(890	)	$	80,035
	Loss on commodity derivatives, net	—			(499		)	—			—			(499		)
	Total revenue	—			65,864			14,562			(890		)	79,536
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	—			47,361			11,502			(890		)	57,973
	Direct operating expenses	—			7,138			1,206			—			8,344
	Selling, general and administrative expenses	—			5,157			—			—			5,157
	Equity compensation expense	—			392			—			—			392
	Depreciation, amortization and accretion expense	—			7,465			415			—			7,880
	Total operating expenses	—			67,513			13,123			(890		)	79,746
	Operating (loss) income	—			(1,649		)	1,439			—			(210		)
	Other income (expense):
	(Loss) earnings from consolidated affiliates	(2,731		)	1,249			—			1,482			—
	Interest expense	—			(2,636		)	—			—			(2,636		)
	Net (loss) income before income tax benefit	(2,731		)	(3,036		)	1,439			1,482			(2,846		)
	Income tax benefit	—			214			—			—			214
	Net (loss) income from continuing operations	(2,731		)	(2,822		)	1,439			1,482			(2,632		)
	Discontinued operations	—			91			—			—			91
	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
		Three months ended September 30, 2012
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
	Revenue	$	—		$	39,346		$	15,371		$	(370	)	$	54,347
	Loss on commodity derivatives, net	—			(946		)	—			—			(946		)
	Total revenue	—			38,400			15,371			(370		)	53,401
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	—			30,194			11,541			(370		)	41,365
	Direct operating expenses	—			4,351			978			—			5,329
	Selling, general and administrative expenses	—			3,150			96			—			3,246
	Equity compensation expense	—			474			—			—			474
	Depreciation, amortization and accretion expense	—			5,102			402			—			5,504
	Total operating expenses	—			43,271			13,017			(370		)	55,918
	Gain on sale of assets, net	—			4			—			—			4
	Operating (loss) income	—			(4,867		)	2,354			—			(2,513		)
	Other income (expense):
	(Loss) earnings from consolidated affiliates	(4,275		)	2,105			—			2,170			—
	Interest expense	—			(1,501		)	—			—			(1,501		)
	Net (loss) income from continuing operations	(4,275		)	(4,263		)	2,354			2,170			(4,014		)
	Discontinued operations	—			(12		)	—			—			(12		)
	Net (loss) income	(4,275		)	(4,275		)	2,354			2,170			(4,026		)
	Net income attributable to noncontrolling interests	—			—			249			—			249
	Net (loss) income attributable to the Partnership	$	(4,275	)	$	(4,275	)	$	2,105		$	2,170		$	(4,275	)
		Condensed Consolidating Statements of Operations
		Nine months ended September 30, 2013
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
	Revenue	$	—		$	179,059		$	41,818		$	(4,361	)	$	216,516
	Gains on commodity derivatives, net	—			110			—			—			110
	Total revenue	—			179,169			41,818			(4,361		)	216,626
	Operating expenses:
	Purchases of natural gas, NGLs and condensate	—			134,041			32,991			(4,361		)	162,671
	Direct operating expenses	—			17,490			3,408			—			20,898
	Selling, general and administrative expenses	—			13,748			—			—			13,748
	Equity compensation expense	—			1,877			—			—			1,877
	Depreciation, amortization and accretion expense	—			21,028			1,243			—			22,271
	Total operating expenses	—			188,184			37,642			(4,361		)	221,465
	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	—			(23,904		)	4,176			—			(19,728		)
Other income (expense):
(Loss) earnings from consolidated affiliates	(28,396		)	3,643			—			24,753			—
Interest expense	—			(6,958		)	—			—			(6,958		)
Net (loss) income before income tax benefit	(28,396		)	(27,219		)	4,176			24,753			(26,686		)
Income tax benefit	—			589			—			—			589
Net (loss) income from continuing operations	(28,396		)	(26,630		)	4,176			24,753			(26,097		)
Discontinued operations	—			(1,766		)	—			—			(1,766		)
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 Operations
	Nine months ended September 30, 2012
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Revenue	$	—		$	123,422		$	15,371		$	(370	)	$	138,423
Gain on commodity derivatives, net	—			3,157			—			—			3,157
Total revenue	—			126,579			15,371			(370		)	141,580
Operating expenses:
Purchases of natural gas, NGLs and condensate	—			88,904			11,541			(370		)	100,075
Direct operating expenses	—			10,572			978			—			11,550
Selling, general and administrative expenses	—			10,005			96			—			10,101
Equity compensation expense	—			1,272			—			—			1,272
Depreciation, amortization and accretion expense	—			15,320			402			—			15,722
Total operating expenses	—			126,073			13,017			(370		)	138,720
Gain on sale of assets, net	—			121			—			—			121
Operating income	—			627			2,354			—			2,981
Other income (expense):
(Loss) earnings from consolidated affiliates	(257		)	2,105			—			(1,848		)	—
Interest expense	—			(3,083		)	—			—			(3,083		)
Net (loss) income from continuing operations	(257		)	(351		)	2,354			(1,848		)	(102		)
Discontinued operations	—			94			—			—			94
Net (loss) income	(257		)	(257		)	2,354			(1,848		)	(8		)
Net income attributable to noncontrolling interests	—			—			249			—			249
Net (loss) income attributable to the Partnership	$	(257	)	$	(257	)	$	2,105		$	(1,848	)	$	(257	)
	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
	Three months ended September 30, 2012
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Net (loss) income	$	(4,275	)	$	(4,275	)	$	2,354		$	2,170		$	(4,026	)
Unrealized gain on post retirement benefit plan assets and liabilities	23			23			—			(23		)	23
Comprehensive (loss) income	(4,252		)	(4,252		)	2,354			2,147			(4,003		)
Less: Comprehensive income attributable to noncontrolling interests	—			—			249			—			249
Comprehensive (loss) income attributable to the Partnership	$	(4,252	)	$	(4,252	)	$	2,105		$	2,147		$	(4,252	)
	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 Comprehensive Income
	Nine months ended September 30, 2012
	Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
Net (loss) income	$	(257	)	$	(257	)	$	2,354		$	(1,848	)	$	(8	)
Unrealized gain on post retirement benefit plan assets and liabilities	40			40			—			(40		)	40
Comprehensive (loss) income	(217		)	(217		)	2,354			(1,888		)	32
Less: Comprehensive income attributable to noncontrolling interests	—			—			249			—			249
Comprehensive (loss) income attributable to the Partnership	$	(217	)	$	(217	)	$	2,105		$	(1,888	)	$	(217	)
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	'
		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		)
	Proceeds from property damage insurance recoveries	—			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		)
	Payments for 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 increase 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	$	—		$	5,051		$	—		$	—		$	5,051
	Supplemental non-cash information
	Decrease in accrued property, plant and equipment	$	—		$	(6,080	)	$	—		$	—		$	(6,080	)
	Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	$	59,995		$	—		$	—		$	—		$	59,995
	Net assets contributed	$	22,129		$	—		$	—		$	—		$	22,129
	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
		Revised Condensed Consolidating Statements of Cash Flows
		Nine months ended September 30, 2012
		Parent			Guarantor Subsidiaries			Non-Guarantor Subsidiary			Consolidating Adjustments			Consolidated
	Net cash provided by operating activities	$	—		$	14,122		$	2,354		—			16,476
	Cash flows from investing activities
	Cost of acquisition, net of cash acquired	—			(51,377		)	—			—			(51,377		)
	Additions to property, plant and equipment	—			(4,196		)	(269		)	—			(4,465		)
	Proceeds from disposal of property, plant and equipment	—			126			—			—			126
	Net contributions from affiliates	12,050			—			—			(12,050		)	—
	Net distributions to affiliates	(13		)	—			—			13			—
	Net cash provided by (used in) investing activities	12,037			(55,447		)	(269		)	(12,037		)	(55,716		)
	Cash flows from financing activities
	Net contributions from affiliates	—			13			—			(13		)	—
	Net distributions to affiliates	—			(10,214		)	(1,836		)	12,050			—
	Unit holder contributions	13			—			—			—			13
	Unit holder distributions	(12,050		)	—			—			—			(12,050		)
	Net distributions to noncontrolling interest owners	—			—			(249		)	—			(249		)
	LTIP tax netting unit repurchase	—			(88		)	—			—			(88		)
	Payments for deferred debt issuance costs	—			(1,140		)	—			—			(1,140		)
	Payments on long-term debt	—			(42,310		)	—			—			(42,310		)
	Borrowings on long-term debt	—			94,690			—			—			94,690
	Net cash (used in) provided by financing activities	(12,037		)	40,951			(2,085		)	12,037			38,866
	Net decrease in cash and cash equivalents	—			(374		)	—			—			(374		)
	Cash and cash equivalents
	Beginning of period	1			870			—			—			871
End of period	$	1		$	496		$	—		$	—		$	497
Supplemental cash flow information
Interest payments	$	—		$	1,894		—			—			1,894
Supplemental non-cash information
Increase in accrued property, plant and equipment	$	—		$	808		$	—		$	—		$	808

Liquidity_Tables

Liquidity (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Schedule of Consolidated Total Leverage Ratios Permitted	'
	The maximum Consolidated Total Leverage Ratio permitted as of the end of any fiscal quarter cannot exceed the ratio set forth below:
	Fiscal Quarter Ended	Consolidated Total Leverage Ratio
	June 30, 2013	5.90:1.00
	September 30, 2013	5.90:1.00
	December 31, 2013	5.75:1.00
	March 31, 2014	5.75:1.00
	June 30, 2014	5.75:1.00
	September 30, 2014	5.50:1.00
	December 31, 2014	5.25:1.00
	March 31, 2015 and each fiscal quarter thereafter	4.50:1.00

Goodwill_and_intangible_assets1

Goodwill and intangible assets (Tables)	9 Months Ended
	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]	'
Schedule of Finite-Lived Intangible Assets [Table Text Block]	'
		30-Sep-13
	Customer contracts	$	12,082
	Accumulated amortization	(7,731		)
	Intangible assets, net	$	4,351

Organization_and_Basis_of_Pres2

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

0 Months Ended

9 Months Ended

6 Months Ended

9 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

Aug. 08, 2013

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 10, 2013

Sep. 30, 2013

Sep. 30, 2013

Aug. 08, 2013

Dec. 31, 2012

Sep. 30, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Jul. 02, 2012

Apr. 15, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

counties

HPGT System [Member]

Midla System [Member]

Ala Tenn System [Member]

ArcLight [Member]

ArcLight [Member]

General Partner [Member]

Partnership Interest [Member]

Partnership Interest [Member]

Partnership Interest [Member]

High Point Infrastructure Partners, LLC [Member]

High Point Infrastructure Partners, LLC [Member]

Issuance of Preferred Units [Member]

Issuance of Preferred Units [Member]

Chatom Processing, Gathering and Fraftionation Plant [Member]

Debt Instrument, Fourth Amendment [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

Meters

mi

mi

mi

bbl

ArcLight [Member]

Series A [Member]

High Point Infrastructure Partners, LLC [Member]

Revolving Credit Facility [Member]

ArcLight [Member]

mi

ft

High Point Infrastructure Partners, LLC [Member]

Series A [Member]

Repayment of Debt [Member]

Producers

Series A [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership interest

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Length of pipeline

'

'

'

400

370

295

700

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of meters

'

'

'

40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of producers

'

'

'

32

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

County in which entity operates

'

8

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of voting interests acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

90.00%

'

'

87.40%

'

'

'

'

'

Contributed capital

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$15,000,000

'

'

'

'

'

'

Preferred units issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,142,857

5,142,857

'

'

'

'

'

'

Number of natural gas collection receipt points

'

'

'

'

'

'

75

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Water depth of natural gas collection receipt points, maximum

'

'

'

'

'

'

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Million barrels of storage capacity

'

'

'

'

'

'

'

1,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transaction expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,500,000

'

'

'

'

'

'

Payments on long-term debt

'

99,821,000

42,310,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,500,000

'

'

'

'

Other Ownership Interests, Units Outstanding

'

'

'

'

'

'

'

'

'

0

4,526,066

4,526,000

'

'

'

'

'

'

'

'

'

'

Incentive Distribution Right Allocation

'

'

'

'

'

'

'

'

14.98%

'

'

'

85.02%

'

'

'

'

'

'

'

'

'

Incentive Distribution Right, After Minimum Quarterly Distributions, Percent

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

48.00%

'

'

'

Incentive Distribution, Distribution Per Unit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.41

'

'

'

General partner's warrants to purchase

300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant exercise price

0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant exercisable after period

'18 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants exercisable if the volume weighted average closing price of the common units exceed

25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants exercisable if the exeeded price per share is traded on a consecutive basis

'30 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Escrow Deposit

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unitholder contributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$35,196,000

$13,000

$12,500,000

Summary_of_Significant_Account1

Summary of Significant Accounting Policies Goodwill and intangible assets (Details)	6 Months Ended
	Jun. 30, 2013
Minimum [Member]	'
Goodwill and Intangible Assets Policy [Abstract]	'
Finite-Lived Intangible Asset, Useful Life	'0 years 5 months 0 days
Maximum [Member]	'
Goodwill and Intangible Assets Policy [Abstract]	'
Finite-Lived Intangible Asset, Useful Life	'0 years 35 months 0 days

Acquisitions_and_Divestitures_1

Acquisitions and Divestitures (High Point) (Details) (USD $)

3 Months Ended

6 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2012

Jun. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Apr. 15, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

High Point Infrastructure Partners, LLC [Member]

High Point Infrastructure Partners, LLC [Member]

High Point Infrastructure Partners, LLC [Member]

AIM Midstream Holdings [Member]

Series A [Member]

Series A [Member]

Series A [Member]

mi

Gas_Receipt_Point

Partnership Interest [Member]

AIM Midstream Holdings [Member]

Issuance of Preferred Units [Member]

High Point Infrastructure Partners, LLC [Member]

Partnership Interest [Member]

High Point Infrastructure Partners, LLC [Member]

High Point Infrastructure Partners, LLC [Member]

Restructuring Cost and Reserve [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of voting interests acquired

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

Length of pipeline

'

'

'

'

'

'

'

'

'

700

'

'

'

'

'

Gas receipt points

'

'

'

'

'

'

'

'

'

'

75

'

'

'

'

Total consideration for Issuance of preferred units

'

'

'

'

'

'

'

'

'

'

$15,000,000

'

'

'

'

Preferred units issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,142,857

Partnership cancellation of subordinated units (percent)

'

'

'

'

'

'

'

'

'

'

'

90.00%

'

90.00%

'

Fair value per unit

'

'

'

'

'

'

'

'

'

'

'

'

$17.50

'

'

Series A convertible preferred units

92,912,000

'

'

'

92,912,000

'

90,000,000

0

'

'

'

'

'

'

'

Distributions to existing interest

0

'

0

0

15,612,000

0

'

'

'

'

'

'

15,600,000

'

'

Cash and cash equivalents

'

'

'

'

'

'

1,935,000

'

'

'

'

'

'

'

'

Accounts receivable

'

'

'

'

'

'

3,629,000

'

'

'

'

'

'

'

'

Unbilled revenue

'

'

'

'

'

'

1,446,000

'

'

'

'

'

'

'

'

Other current assets

'

'

'

'

'

'

2,049,000

'

'

'

'

'

'

'

'

Property, plant and equipment, net

'

'

'

'

'

'

82,615,000

'

'

'

'

'

'

'

'

Other assets

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

Accounts payable

'

'

'

'

'

'

-11,000

'

'

'

'

'

'

'

'

Accrued expenses and other current liabilities

'

'

'

'

'

'

-4,077,000

'

'

'

'

'

'

'

'

Current portion of long-term debt

'

'

'

'

'

'

-893,000

'

'

'

'

'

'

'

'

Asset retirement obligation liability

'

'

'

'

'

'

-25,763,000

'

'

'

'

'

'

'

'

Total identifiable net assets

'

'

'

'

'

'

61,930,000

'

'

'

'

'

'

'

'

Revenues

79,536,000

53,401,000

'

'

216,626,000

141,580,000

'

'

10,700,000

19,700,000

'

'

'

'

'

Net (loss) income attributable to the Partnership

($2,731,000)

($4,275,000)

($4,275,000)

'

($28,396,000)

($257,000)

'

'

$1,200,000

$2,700,000

'

'

'

'

'

Acquisitions_and_Divestitures_2

Acquisitions and Divestitures (Chatom Gathering, Processing and Fractionation Plant(Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Jul. 02, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

High Point Infrastructure Partners, LLC [Member]

High Point Infrastructure Partners, LLC [Member]

Chatom Processing, Gathering and Fraftionation Plant [Member]

Chatom Processing, Gathering and Fraftionation Plant [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

Non-Guarantor Subsidiaries [Member]

mi

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Pro Forma Revenue

'

'

'

'

$174,179

'

'

'

'

'

'

'

'

'

'

Payments on long-term debt

'

'

'

99,821

42,310

'

'

'

'

'

'

'

0

0

'

Revenues

79,536

53,401

'

216,626

141,580

'

10,700

19,700

'

'

14,562

15,371

41,818

15,371

'

Consideration transferred to acquire the Chatom Assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash

'

'

'

'

'

'

'

'

'

51,377

'

'

'

'

'

Property, plant and equipment, net

316,655

'

'

316,655

'

223,819

'

'

'

58,279

58,791

'

58,791

'

58,818

Asset retirement cost

34,440

'

'

34,440

'

8,319

'

'

'

-452

468

'

468

'

458

Accounts payable

2,248

'

'

2,248

'

5,527

'

'

'

399

210

'

210

'

427

Accrued gas purchases

16,320

'

'

16,320

'

17,034

'

'

'

3,631

2,614

'

2,614

'

2,428

Asset retirement obligation

'

'

'

'

'

'

'

'

'

452

'

'

'

'

'

Non-controlling interest

7,400

'

'

7,400

'

7,438

'

'

'

7,407

7,400

'

7,400

'

7,438

Total identifiable net assets

'

'

'

'

'

'

'

'

'

51,377

'

'

'

'

'

Acquisition (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total cash consideration

'

'

'

'

'

'

'

'

'

51,400

'

0

'

0

'

Chatom Assets Location

'

'

'

'

'

'

'

'

15

'

'

'

'

'

'

Capacity of Refrigeration Processing Plant

'

'

'

'

'

'

'

'

25

'

'

'

'

'

'

Fractionation unit

'

'

'

'

'

'

'

'

1,900

'

'

'

'

'

'

Long-ton per day sulfur recovery

'

'

'

'

'

'

'

'

160

'

'

'

'

'

'

Gas Gathering System

'

'

'

'

'

'

'

'

29

'

'

'

'

'

'

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

12.60%

'

'

12.60%

'

'

'

'

'

'

'

'

'

'

'

Assumed Cost of Capital

'

'

'

9.25%

'

'

'

'

'

'

'

'

'

'

'

Inflationary Cost

'

'

'

2.50%

'

'

'

'

'

'

'

'

'

'

'

Effective Income Tax Rate, Continuing Operations

'

'

'

35.00%

'

'

'

'

'

'

'

'

'

'

'

Effective Income Tax Rate Reconciliation, State and Local Income Taxes

'

'

'

6.50%

'

'

'

'

'

'

'

'

'

'

'

Net (loss) income attributable to the Partnership

-2,731

-4,275

-4,275

-28,396

-257

'

1,200

2,700

'

'

1,249

2,105

3,643

2,105

'

Business Acquisition, Pro Forma Net Income (Loss)

'

'

'

'

$1,422

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Pro Forma Earnings Per Share, Basic

'

'

'

'

$0.14

'

'

'

'

'

'

'

'

'

'

Acquisitions_and_Divestitures_3

Acquisitions and Divestitures (Consideration Transferred) (Details) (USD $)	3 Months Ended			9 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Jul. 02, 2012
							Chatom Processing, Gathering and Fraftionation Plant [Member]	Chatom Processing, Gathering and Fraftionation Plant [Member]
							mi
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'	'	'
Percentage of voting interests acquired	'	'	'	'	'	'	'	87.40%
Cash	'	'	'	'	'	'	'	$51,377
Unbilled revenue	23,756	'	'	23,756	'	21,512	'	4,535
Property, plant and equipment, net	316,655	'	'	316,655	'	223,819	'	58,279
Asset retirement obligation liability	-34,440	'	'	-34,440	'	-8,319	'	452
Accounts Payable, Current	-2,248	'	'	-2,248	'	-5,527	'	-399
Gas Purchase Payable, Current	-16,320	'	'	-16,320	'	-17,034	'	-3,631
Asset Retirement Obligation, Current	'	'	'	'	'	'	'	-452
Stockholders' Equity Attributable to Noncontrolling Interest	-7,400	'	'	-7,400	'	-7,438	'	-7,407
Total identifiable net assets	'	'	'	'	'	'	'	51,377
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	'	'	'	'	'	'	51,400
Chatom Assets Location	'	'	'	'	'	'	15	'
Capacity of Refrigeration Processing Plant	'	'	'	'	'	'	25	'
Fractionation unit	'	'	'	'	'	'	1,900	'
Long-ton per day sulfur recovery	'	'	'	'	'	'	160	'
Gas gathering system	'	'	'	'	'	'	29	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	12.60%	'	'	12.60%	'	'	'	'
Revenues	79,536	53,401	'	216,626	141,580	'	'	'
Net income (loss)	($2,731)	($4,275)	($4,275)	($28,396)	($257)	'	'	'

Acquisitions_and_Divestitures_4

Acquisitions and Divestitures (Other Non-Strategic Midstream Assets) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition [Line Items]	'	'	'	'
Assumed discount rate	0.00%	'	'	'
Gathering and Processing Assets [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Impairment	$0	$0	$1,807,000	$0
Assets held for sale net book value	$900,000	'	$900,000	'
Gathering and Processing Assets [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Assumed discount rate	0.00%	'	'	'
Decline in throughput volumes, rate	2.50%	'	'	'

Acquisitions_and_Divestitures_5

Acquisitions and Divestitures (Identifiable Assets and Liabilities Classified As Held for Sale) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Unbilled revenue	$23,756	$21,512
Property, plant and equipment, net	316,655	223,819
Accrued gas purchases	($16,320)	($17,034)

Acquisitions_and_Divestitures_6

Acquisitions and Divestitures (Revenue, Expense, and Loss from Operations, Classified as Held for Sale) (Details) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'	'
(Loss) gain from operations of disposal groups	$91	($12)	'	'	($1,766)	$94
Gathering and Processing Assets [Member]	'	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'	'
Impairment	0	0	'	'	1,807	0
(Loss) gain from operations of disposal groups	$91	($12)	'	'	($1,766)	$94
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic	0.02	0	'	'	-0.19	0.01
Limited partners' (loss) per unit from discontinued operations (diluted)	-0.2	'	0.01	0.01	-0.19	'

Acquisitions_and_Divestitures_7

Acquisitions and Divestitures Blackwater (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Apr. 15, 2013	Sep. 30, 2013	Sep. 30, 2013	Apr. 15, 2013	Sep. 30, 2013	Dec. 10, 2013
						Terminals [Member]	Terminals [Member]	Terminals [Member]	Terminals [Member]	Terminals [Member]
										bbl
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'
Million barrels of storage capacity	'	'	'	'	'	'	'	'	'	1,300,000
Total identifiable net assets	'	'	'	'	$61,930	'	'	$22,700	'	'
Revenue, Net	80,035	54,347	216,516	138,423	'	3,458	'	'	6,326	'
Net loss	($2,541)	($4,026)	($27,863)	($8)	'	($100)	($700)	'	'	'

Concentration_of_Credit_Risk_a2

Concentration of Credit Risk and Trade Accounts Receivable (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012
Concentration Risk [Line Items]	'	'	'	'	'
Allowance for Doubtful Accounts Receivable	$0	'	$0	'	$0
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	26.00%	23.00%	28.00%	29.00%	'
Customer B [Member]	'	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	13.00%	17.00%	13.00%	0.00%	'
Cusotmer C [Member]	'	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	12.00%	11.00%	12.00%	12.00%	'
Cusotmer D [Member]	'	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	0.00%	12.00%	0.00%	16.00%	'
Customer Other [Member]	'	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'	'
Entity-Wide Revenue, Major Customer, Percentage	49.00%	37.00%	47.00%	43.00%	'

Derivatives_Fair_Value_of_Comm

Derivatives (Fair Value of Commodity Derivatives) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Gross Risk Management Assets	$1,196	$1,889
Gross Risk Management Liabilities	-146	-920
Net Risk Management Assets (Liabilities)	1,050	969
Gross Risk Management Assets	0	0
Gross Risk Management Liabilities	-471	0
Net Risk Management Assets (Liabilities)	471	0
Risk Management Assets [Member] | Commodity derivatives [Member]	'	'
Derivative [Line Items]	'	'
Gross Risk Management Assets	1,196	1,889
Gross Risk Management Liabilities	-146	-920
Net Risk Management Assets (Liabilities)	1,050	969
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	0
Gross Risk Management Liabilities	-349	0
Net Risk Management Assets (Liabilities)	349	0
Risk Management Liabilities - Long Term [Member] | Commodity derivatives [Member]	'	'
Derivative [Line Items]	'	'
Gross Risk Management Assets	0	0
Gross Risk Management Liabilities	-122	0
Net Risk Management Assets (Liabilities)	$122	$0

Derivatives_Realized_and_Unrea

Derivatives (Realized and Unrealized Gains (Losses)) (Details) (Commodity derivatives [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivatives, Fair Value [Line Items]	'	'	'	'
Gain (Loss) on Sale of Derivatives	($124)	'	$318	'
Gain on commodity derivatives, net	-913	'	-1,158	'
Unrealized Gain (Loss or Write-down) [Member]	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Gain (Loss) on Sale of Derivatives	261	816	797	1,425
Gain on commodity derivatives, net	-760	-1,762	-687	1,732
Interest Expense [Member]	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Gain (Loss) on Sale of Derivatives	-101	'	-101	'
Gain on commodity derivatives, net	-153	'	-471	'
Other Income [Member]	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Gain (Loss) on Sale of Derivatives	-284	'	-378	'
Gain on commodity derivatives, net	$0	'	$0	'

Derivatives_Details_Textual

Derivatives (Details Textual) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Derivative [Line Items]	'	'
Aggregate notional volume of our commodity derivative	3,000,000	3,000,000
Interest Rate Swap [Member]	'	'
Derivative [Line Items]	'	'
Notional amount of interest rate swap	$100,000,000	$100,000,000
Weather Contract [Member]	'	'
Derivative [Line Items]	'	'
Potential proceeds from derivative contract	10,000,000	'
Fair value of derivative	0	0
Payment for weather derivative premium	'	1,100,000
Derivative term of contract	'12 months	'12 months
Risk management assets	$800,000	$800,000

Fair_Value_Measurement_Details

Fair Value Measurement (Details) (USD $)

12 Months Ended

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Commodity Contract [Member]

Commodity Contract [Member]

Commodity Contract [Member]

Commodity Contract [Member]

Commodity Contract [Member]

Commodity Contract [Member]

Commodity Contract [Member]

Commodity Contract [Member]

Commodity Contract [Member]

Commodity Contract [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Carrying Reported Amount Fair Value Disclosure [Member]

Carrying Reported Amount Fair Value Disclosure [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Carrying Reported Amount Fair Value Disclosure [Member]

Carrying Reported Amount Fair Value Disclosure [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Estimate of Fair Value, Fair Value Disclosure [Member]

Derivatives, Fair Value [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transfers out of Level 3, into Level 2

$1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Carrying Amount

'

'

'

294,000

969,000

'

'

'

'

'

'

'

'

-472,000

0

'

'

'

'

'

'

Estimated Fair Value

'

$294,000

$969,000

'

'

$0

$0

$294,000

$969,000

$0

$0

($472,000)

$0

'

'

$0

$0

($472,000)

$0

$0

$0

Property_Plant_and_Equipment_D

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

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

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]

Dock [Member] [Member]

Dock [Member] [Member]

Tanks [Member]

Tanks [Member]

Equipment [Member]

Equipment [Member]

Computer software [Member]

Computer software [Member]

Property, Plant And Equipment [Member]

Property, Plant And Equipment [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

'

'

$6,068

$2,254

$5,949

$5,053

$1,108

$0

$3,537

$1,432

$98,819

$98,106

$236,450

$163,447

$11,278

$8,957

$7,942

$0

$22,353

$0

$5,875

$4,785

$2,566

$1,950

'

$285,984

'

'

'

'

'

'

'

'

'

'

'

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

-85,290

-62,165

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment, net

$316,655

$223,819

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$401,945

'

'

'

'

'

'

'

'

'

'

'

'

Property_Plant_and_Equipment_D1

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

3 Months Ended

6 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

Sep. 30, 2013

Mar. 31, 2013

Sep. 30, 2012

Jun. 30, 2012

Jun. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

AlaTenn system [Member]

AlaTenn system [Member]

Gathering and Processing Assets [Member]

Gathering and Processing Assets [Member]

Gathering and Processing Assets [Member]

Gathering and Processing Assets [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Gathering and Processing Assets [Member]

Gathering and Processing Assets [Member]

Income Approach Valuation Technique [Member]

Discounted Cash Flow Technique [Member]

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property plant and equipment gross

'

'

'

'

'

'

'

$99,500,000

$26,100,000

'

'

'

'

'

'

Capitalized interest

100,000

'

'

'

'

100,000

'

'

'

'

'

'

'

'

'

Depreciation

6,500,000

'

'

'

'

18,900,000

'

'

'

'

'

'

'

'

'

AROs included in other liabilities for specific assets

'

'

'

'

'

25,763,000

'

'

'

'

'

'

'

'

'

Accretion expense, included in depreciation expense

200,000

'

'

100,000

100,000

358,000

'

'

'

'

'

'

'

'

'

Insurance proceeds from involuntary conversion of property, plant and equipment

600,000

500,000

'

'

'

482,000

0

'

'

'

'

'

'

'

'

Gain on involuntary conversion of property, plant and equipment

0

400,000

0

'

'

343,000

0

'

'

'

'

'

'

'

'

Gain (loss) on involuntary conversion of property, plant and equipment

0

100,000

0

'

'

15,232,000

0

'

'

'

'

'

'

'

'

Proceeds from Insurance Settlement, Operating Activities

'

'

'

'

'

1,100,000

'

'

'

'

'

'

'

'

'

Assumed discount rate

0.00%

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

'

Decline in throughput volumes, rate

'

'

'

'

'

'

'

'

'

'

'

'

'

2.50%

'

Impairment

'

'

'

'

'

'

'

'

'

$0

$0

$1,807,000

$0

'

$1,800,000

Asset_Retirement_Obligation_De

Asset Retirement Obligation (Details) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2013	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2013
Asset Retirement Obligation Disclosure [Abstract]	'	'	'	'
Balance at beginning of period	$34,440,000	'	'	$34,440,000
Obligations assumed	'	'	'	25,763,000
Accretion expense	200,000	100,000	100,000	358,000
Balance at end of period	'	'	'	8,319,000
Other assets, net	$1,000,000	'	'	$1,000,000

Debt_Obligations_Details

Debt Obligations (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Due to Affiliate	$20,000	$0
Revolving loan facility	121,035	128,285
Other Long-term Debt	157	0
Notes Payable	1,174	'
Long-term debt	152,169	128,285
Long- term debt	124,888	128,285
Less: current portion of long-term debt	$7,281	$0

Debt_Obligations_Details_Textu

Debt Obligations (Details Textual) (USD $)

9 Months Ended

9 Months Ended

0 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Apr. 15, 2013

Sep. 30, 2013

Sep. 30, 2013

Apr. 15, 2013

Sep. 30, 2013

Jul. 31, 2013

Revolving Credit Facility [Member]

Eurodollar [Member]

Debt Instrument, Third Amendment [Member]

Debt Instrument, Third Amendment [Member]

Debt Instrument, Third Amendment [Member]

Debt Instrument, Third Amendment [Member]

Debt Instrument, Fourth Amendment [Member]

Debt Instrument, Fourth Amendment [Member]

Insurance Premium Financing [Member]

Subsequent Event [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Eurodollar [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Minimum [Member]

Debt Instrument, Fourth Amendment [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Long-Term Debt (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

Leverage ratio requirement

4.5

'

4.5

'

'

4

4

'

'

'

'

'

'

Total indebtedness

$130,900,000

'

$130,900,000

'

'

'

'

'

'

'

'

'

'

Ratio of indebtedness to net capital

5.7

'

5.7

'

'

'

'

'

'

'

'

'

'

Maximum outstanding borrowings under credit facility

'

'

'

150,000,000

'

'

'

'

'

'

175,000,000

'

'

Description of variable rate basis

'

'

'

'

'Eurodollar Rate

'

'

'

'

'

'

'

'

Letter of credit outstanding

2,600,000

'

2,600,000

'

'

'

'

'

'

'

'

'

'

Debt issuance cost

5,900,000

'

'

'

'

'

'

'

'

'

'

'

'

Basis spread on variable rate

'

'

'

'

0.50%

'

'

'

'

'

'

'

'

Additional fees

'

'

'

0.13%

'

'

'

'

0.13%

'

'

'

'

Payments on long-term debt

99,821,000

42,310,000

'

'

'

'

'

12,500,000

'

'

'

'

'

Leverage covenant ratio test

'

'

'

4.48

'

'

'

'

'

'

'

'

'

Revolving loan facility

121,035,000

'

128,285,000

'

'

'

'

'

'

123,700,000

130,000,000

'

129,200,000

Remaining borrowing capacity

'

'

'

'

'

'

'

'

'

39,300,000

45,000,000

'

'

Debt, Weighted Average Interest Rate

4.50%

4.09%

'

'

'

'

'

'

'

'

'

'

'

Insurance premium financing

3,300,000

'

'

'

'

'

'

'

'

'

'

'

'

Facility fee (percent)

'

'

'

'

'

'

'

'

0.50%

'

'

3.22%

'

Periodic payment amount

$200,000

'

'

'

'

'

'

'

'

'

'

'

'

Partners_Capital_Details

Partners' Capital (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Aug. 08, 2013	Dec. 31, 2012
						AIM Midstream Holdings No. of units outstanding [Member]	AIM Midstream Holdings No. of units outstanding [Member]	AIM Midstream Holdings No. of units outstanding [Member]
Less: Comprehensive income attributable to noncontrolling interests	$190	$249	$533	$249	'	'	'	'
Limited partner common units	9,209,000	'	9,209,000	'	9,165,000	4,705,000	'	4,639,000
Limited partner subordinated units	'	'	'	'	'	0	4,526,066	4,526,000
Preferred units	'	'	'	'	'	5,204,000	'	0
General partner interest units	185,000	'	185,000	'	185,000	185,000	'	185,000
General partner units	185,000	'	185,000	'	185,000	'	'	'

Partners_Capital_Details_Textu

Partners Capital (Details Textual) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

1 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

Aug. 08, 2013

Sep. 30, 2013

Jun. 30, 2012

Jun. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Apr. 15, 2013

Dec. 31, 2012

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Sep. 30, 2013

Apr. 15, 2013

Apr. 15, 2013

Sep. 30, 2013

Sep. 30, 2013

Apr. 15, 2013

Sep. 30, 2013

Aug. 08, 2013

Dec. 31, 2012

Jan. 25, 2013

Sep. 30, 2013

Sep. 30, 2013

Aug. 14, 2013

Jul. 23, 2013

Apr. 15, 2013

Apr. 15, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Partnership Interest [Member]

Series A [Member]

Series A [Member]

Series A [Member]

Debt Instrument, Fourth Amendment [Member]

Revolving Credit Facility [Member]

Cash Distribution [Member]

General Partner [Member]

High Point Infrastructure Partners, LLC [Member]

High Point Infrastructure Partners, LLC [Member]

Partnership Interest [Member]

Partnership Interest [Member]

Partnership Interest [Member]

Partnership Interest [Member]

Payable Current Quarter [Member]

Payable Next Fiscal Quarter [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

General Partner [Member]

Total Partners' Capital

Total Partners' Capital

General Partner [Member]

General Partner [Member]

General Partner [Member]

High Point Infrastructure Partners, LLC [Member]

Partnership Interest [Member]

Issuance of Preferred Units [Member]

Debt Instrument, Fourth Amendment [Member]

Series A [Member]

Series A [Member]

Series A [Member]

Cash Distribution [Member]

Cash Distribution [Member]

Third Amended and Restated Agreement [Member]

Liquidation and Winding-up of Partnership [Member]

ArcLight [Member]

AIM Midstream Holdings [Member]

High Point Infrastructure Partners, LLC [Member]

High Point Infrastructure Partners, LLC [Member]

Series A [Member]

Issuance of Preferred Units [Member]

Series A [Member]

Series A [Member]

Series A [Member]

Third Amended and Restated Agreement [Member]

AIM Midstream Holdings [Member]

Repayment of Debt [Member]

Series A [Member]

Subsidiary, Sale of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Distributions

'

$80,000

$80,000

$241,000

$240,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$16,672,000

$12,050,000

$340,000

$241,000

'

Partners Capital (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

General partner interest

'

'

'

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

98.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partnership cancellation of subordinated units (percent)

'

'

'

'

'

'

'

'

90.00%

'

90.00%

'

20.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Contributed capital

'

'

'

'

'

'

'

'

'

'

'

15,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred units issued

'

'

'

'

'

'

'

'

'

'

'

5,142,857

'

'

'

'

'

5,142,857

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transaction expenses

'

'

'

'

'

'

'

'

'

'

'

2,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments on long-term debt

'

'

'

'

99,821,000

42,310,000

'

'

'

'

'

'

'

12,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividend distribution

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution announced

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.50

'

'

$1.81

$0.45

'

'

'

'

'

'

'

'

Fair value per unit

'

'

'

'

'

'

'

'

'

$17.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$17.50

$17.50

'

'

'

'

'

'

Series A convertible preferred units

'

92,912,000

'

'

92,912,000

'

90,000,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total identifiable net assets

'

'

'

'

'

'

61,930,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of Series A Units in excess of net assets received

'

0

0

0

-15,612,000

0

'

'

'

-15,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-15,612,000

'

-312,000

'

'

Dilutive effect of unit based awards

'

172,552

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends payable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,300,000

1,600,000

'

'

'

'

'

'

'

'

'

'

Other Ownership Interests, Units Outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

4,526,066

4,526,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Incentive Distribution Right Allocation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

14.98%

85.02%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Incentive Distribution Right, After Minimum Quarterly Distributions, Percent

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

48.00%

'

'

'

'

'

Incentive Distribution, Distribution Per Unit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.41

'

'

'

'

'

General partner's warrants to purchase

300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant exercise price

0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant exercisable after period

'18 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants exercisable if the volume weighted average closing price of the common units exceed

25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants exercisable if the exeeded price per share is traded on a consecutive basis

'30 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Escrow Deposit

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unitholder contributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35,196,000

13,000

35,196,000

13,000

12,500,000

Assumed discount rate

'

0.00%

'

'

'

'

'

'

'

0.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value input, distribution growth rate

'

'

'

'

'

'

'

'

'

0.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value, paid in kind distributions

'

$21.15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Member or Limited Partner, Payment In Kind Declared

'

$1,572,000

$0

$0

$2,912,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value input, option value

'

3.18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners_Capital_Calculation_o

Partners' Capital (Calculation of Net Income (Loss) Per Limited Partner Unit) (Details) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Partners' Capital [Abstract]	'	'	'	'	'	'
Net loss before income tax benefit	($2,632)	($4,014)	'	'	($26,097)	($102)
Net loss from continuing operations attributable to the Partnership	-2,822	'	-4,263	-351	-26,630	'
Net (loss) income attributable to the Partnership	-2,731	-4,275	-4,275	'	-28,396	-257
Declared cash distributions on Series A Units	1,301	'	0	0	2,375	'
Declared PIK distributions on Series A Units	1,572	'	0	0	2,912	'
Fair value of Series A Units in excess of value of contributed High Point System	0	'	0	0	15,612	0
General partner's distribution	80	'	80	241	240	'
General Partners' Capital Account, Period Undistributed Income (Loss) From Continuing Operations, Amount	170	'	166	248	1,074	'
General partner's share in undistributed loss	-167	'	-166	-246	-1,102	'
Net loss from continuing operations available to limited partners	-5,483	'	-4,177	-344	-46,159	'
Net loss available to limited partners	-5,342	'	-4,189	-252	-47,783	'
Income (loss) from discontinued operations	6,663	9,108	'	'	8,334	9,103
Limited partners’ net (loss) income from continuing operations per unit (basic)	-0.82	-0.46	'	'	-5.54	-0.04
Limited partners’ net (loss) income per unit (basic)	-0.8	-0.46	'	'	-5.73	-0.03
Terminals [Member]	'	'	'	'	'	'
Statement of Partners' Capital [Abstract]	'	'	'	'	'	'
Net loss before income tax benefit	-122	0	'	'	-536	0
Net (loss) income attributable to the Partnership	($175)	'	$0	'	($650)	$0

LongTerm_Incentive_Plan_Detail

Long-Term Incentive Plan (Details)	3 Months Ended		6 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Mar. 31, 2013
Table Summarizes Unit Based Awards	'	'	'	'	'
Outstanding, Beginning period	'	172,551	162,860	90,938	96,733
Granted	28,042	'	34,560	108,430	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	-893	12,517	12,517	-13,320	'
LTIP vesting, Shares	24,482	0	24,869	86,648	'
Outstanding, Ending period	99,400	160,034	160,034	99,400	96,733
Maximum [Member]	'	'	'	'	'
Table Summarizes Unit Based Awards	'	'	'	'	'
Fair Value Per Unit	21.89	21.4	21.4	21.89	'
Minimum [Member]	'	'	'	'	'
Table Summarizes Unit Based Awards	'	'	'	'	'
Fair Value Per Unit	13.36	14.7	14.7	13.36	'

Long_Term_Incentive_Plan_Detai

Long Term Incentive Plan (Details Textual) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended				3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jul. 11, 2012	Sep. 30, 2013	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2013
								Phantom units [Member]	Phantom units [Member]	Phantom units [Member]	Phantom units [Member]
Long Term Incentive Plan (Additional Textual) [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Long Term Incentive Plan available for future grant	846,203	'	'	846,203	'	920,193	'	'	'	'	'
Grants Issued Under Long Term Incentive Plan	25.00%	'	'	25.00%	'	'	'	'	'	'	'
Equity compensation expense	$392,000	$474,000	'	$1,877,000	$1,272,000	'	'	$400,000	$500,000	$1,300,000	$1,800,000
Total fair value of vested units	'	'	500,000	1,600,000	'	'	'	'	'	'	'
Compensation cost related unvested awards	$1,100,000	'	$2,100,000	$1,100,000	'	'	'	'	'	'	'
Weighted average period cost recognized	'	'	'	'1 year 7 months 15 days	'	'	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	'	'	'	'	'	'	871,750	'	'	'	'

PostEmployment_Benefits_Detail

Post-Employment Benefits (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cost recognized in Unaudited Condensed Consolidated Statements of Operations	'	'	'	'
Net periodic (benefit) cost	'	'	($55,000)	($61,000)
OPEB Plan [Member]	'	'	'	'
Cost recognized in Unaudited Condensed Consolidated Statements of Operations	'	'	'	'
Service cost	1,000	1,000	3,000	3,000
Interest cost	4,000	4,000	12,000	12,000
Expected return on plan assets	-17,000	-16,000	-51,000	-49,000
Amortization of net (gain) loss	-6,000	-9,000	-18,000	-27,000
Net periodic (benefit) cost	-18,000	-20,000	-54,000	-61,000
Expected contributions to Plan, remaining fiscal year	$100,000	'	$100,000	'

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Sep. 30, 2013
Future non-cancelable commitments related to certain contractual obligations	'
Contractual Obligation, Due in Next Twelve Months	$154,000
Contractual Obligation, Due in Second Year	793,000
Contractual Obligation, Due in Third Year	762,000
Contractual Obligation, Due in Fourth Year	8,398,000
Contractual Obligation, Due in Fifth Year	506,000
Contractual Obligation, Due after Fifth Year	28,109,000
Contractual Obligation, Total	38,722,000
Operating leases and service contract [Member]	'
Future non-cancelable commitments related to certain contractual obligations	'
Contractual Obligation, Due in Next Twelve Months	154,000	[1]
Contractual Obligation, Due in Second Year	793,000	[1]
Contractual Obligation, Due in Third Year	762,000	[1]
Contractual Obligation, Due in Fourth Year	531,000	[1]
Contractual Obligation, Due in Fifth Year	506,000	[1]
Contractual Obligation, Due after Fifth Year	1,536,000	[1]
Contractual Obligation, Total	4,282,000	[1]
Operating Leases, Future Minimum Payments Due	200,000
Assets retirement obligation [Member]	'
Future non-cancelable commitments related to certain contractual obligations	'
Contractual Obligation, Due in Next Twelve Months	0
Contractual Obligation, Due in Second Year	0
Contractual Obligation, Due in Third Year	0
Contractual Obligation, Due in Fourth Year	7,867,000
Contractual Obligation, Due in Fifth Year	0
Contractual Obligation, Due after Fifth Year	26,573,000
Contractual Obligation, Total	$34,440,000
[1]	Operating leases and service contracts have been reduced by total minimum sublease rentals of $0.2 million due in the future under non-cancelable subleases.

Commitments_and_Contingencies_2

Commitments and Contingencies (Details 1) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2013
Expenses related to operating leases, asset retirement obligations, land site Leases and right-of-way agreements	'	'	'	'
Operating leases	$357	$254	$692	$841
Asset retirement obligation	191	10	23	358
Non operating Income (Expense), Total	($548)	($264)	($715)	($1,199)

Related_Party_Transactions_Det

Related- Party Transactions (Details Textual) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Business development	'	'	($0.90)	'
American Midstream, L.L.C [Member]	'	'	'	'
Related Party Transactions (Textual) [Abstract]	'	'	'	'
Administrative and Operational Service Expenses	3.3	3.1	10.3	9.3
Business development	($0.20)	'	($0.60)	'

Reporting_Segments_Details

Reporting Segments (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment information	'	'	'	'	'	'
Revenue	$80,035	'	$54,347	'	$216,516	$138,423
Loss on commodity derivatives, net	-499	'	-946	'	110	3,157
Direct operating expenses	8,344	'	5,329	'	20,898	11,550
Selling, general and administrative expenses	5,157	'	3,246	'	13,748	10,101
Revenues	79,536	'	53,401	'	216,626	141,580
Natural Gas Midstream Costs	57,973	'	41,365	'	162,671	100,075
Equity compensation expense	392	'	474	'	1,877	1,272
Depreciation and Accretion Expense, Including Discontinued Operation	'	'	'	'	22,355	15,819
Depreciation, Depletion and Amortization	7,880	'	5,504	'	22,271	15,722
Total operating expenses	79,746	'	55,918	'	221,465	138,720
Depreciation and accretion expense	6,500	'	'	'	18,900	'
Gain on involuntary conversion of property, plant and equipment	0	400	0	'	343	0
Gain on sale of assets, net	0	'	4	'	0	121
Operating (loss) income	-210	'	-2,513	'	-19,728	2,981
Income (loss) from operations of disposal groups	91	'	-12	'	-1,766	94
Loss on impairment of property, plant and equipment	0	-100	0	'	-15,232	0
Interest expense	-2,636	'	-1,501	'	-6,958	-3,083
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	-2,846	'	-4,014	'	-26,686	-102
Income Tax Expense (Benefit), Continuing Operations	214	'	'	'	589	'
Income Tax Expense (Benefit)	247	'	0	'	662	0
Net loss before income tax benefit	-2,632	'	-4,014	'	-26,097	-102
Net loss	-2,541	'	-4,026	'	-27,863	-8
Net (loss) income attributable to the Partnership	-2,731	'	-4,275	-4,275	-28,396	-257
Segment Gross Margin	21,380	'	12,978	'	52,815	36,793
Gathering And Processing [Member]	'	'	'	'	'	'
Segment information	'	'	'	'	'	'
Revenue	48,873	'	41,637	'	144,658	101,307
Loss on commodity derivatives, net	-499	'	-946	'	110	3,157
Direct operating expenses	3,720	'	3,567	'	10,694	7,531
Revenues	48,374	'	40,691	'	144,768	104,464
Natural Gas Midstream Costs	38,162	'	32,105	'	116,568	74,775
Segment Gross Margin	10,688	'	10,310	'	28,454	27,321
Transmission [Member]	'	'	'	'	'	'
Segment information	'	'	'	'	'	'
Revenue	27,704	'	12,710	'	65,532	37,116
Loss on commodity derivatives, net	0	'	0	'	0	0
Direct operating expenses	3,994	'	1,762	'	8,943	4,019
Revenues	27,704	'	12,710	'	65,532	37,116
Natural Gas Midstream Costs	19,811	'	9,260	'	46,103	25,300
Segment Gross Margin	7,864	'	2,668	'	19,296	9,472
Terminals [Member]	'	'	'	'	'	'
Segment information	'	'	'	'	'	'
Revenue	'	'	'	'	6,326	'
Loss on commodity derivatives, net	0	'	'	'	0	'
Direct operating expenses	630	'	'	'	1,261	'
Revenues	3,458	'	'	'	6,326	'
Natural Gas Midstream Costs	0	'	'	'	0	'
Net loss before income tax benefit	-122	'	0	'	-536	0
Net (loss) income attributable to the Partnership	-175	'	'	0	-650	0
Segment Gross Margin	2,828	'	'	'	5,065	'
Terminals [Member]	'	'	'	'	'	'
Segment information	'	'	'	'	'	'
Revenue	3,458	'	'	'	'	'
Net loss	($100)	'	'	'	($700)	'

Reporting_Segments_Details_Tex

Reporting Segments (Details Textual) (USD $)	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Apr. 15, 2013
	segment	Gathering And Processing [Member]	Gathering And Processing [Member]	Gathering And Processing [Member]	Gathering And Processing [Member]	Transmission [Member]	Transmission [Member]	Transmission [Member]	Transmission [Member]	High Point Infrastructure Partners, LLC [Member]
										ArcLight [Member]
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'
Construction, Operating and Maintenace Expenses	'	$0.30	$0.10	$0.40	$0.60	$0.10	$0.80	$0.10	$2.30	'
Number of Operating Segments	3	'	'	'	'	'	'	'	'	'
Percentage of voting interests acquired	'	'	'	'	'	'	'	'	'	90.00%

Subsidiary_Guarantors_Details

Subsidiary Guarantors (Details) (USD $)	3 Months Ended				6 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Apr. 15, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'
Cash and cash equivalents, including discontinued operations	$3,475	'	'	'	'	$3,475	'	'	'
Acquisition Costs, Period Cost	'	'	'	'	'	0	-51,377	'	'
Percentage of agragate limited partner interest	'	'	'	'	100.00%	100.00%	'	'	'
Current assets:	'	'	'	'	'	'	'	'	'
Accounts receivable	5,646	'	'	'	'	5,646	'	'	1,958
Unbilled revenue	23,756	'	'	'	'	23,756	'	'	21,512
Risk management assets	1,050	'	'	'	'	1,050	'	'	969
Other current assets	5,226	'	'	'	'	5,226	'	'	3,226
Assets Held-for-sale, Current	1,276	'	'	'	'	1,276	'	'	0
Total current assets	40,427	'	'	'	'	40,427	'	'	28,241
Property, plant and equipment, net	316,655	'	'	'	'	316,655	'	'	223,819
Noncurrent assets held for sale, net	3,016	'	'	'	'	3,016	'	'	0
Intangible Assets, Net (Excluding Goodwill)	4,351	'	'	'	'	4,351	'	'	0
Goodwill	16,447	'	'	'	'	16,447	'	'	0
Deferred Tax Assets, Gross	5,741	'	'	'	'	5,741	'	'	0
Investment in subsidiaries	0	'	'	'	'	0	'	'	0
Other assets	6,202	'	'	'	'	6,202	'	'	4,636
Total assets	392,839	'	'	'	'	392,839	'	'	256,696
Current liabilities:	'	'	'	'	'	'	'	'	'
Accounts payable	2,248	'	'	'	'	2,248	'	'	5,527
Accrued gas purchases	16,320	'	'	'	'	16,320	'	'	17,034
Risk management liabilities	349	'	'	'	'	349	'	'	0
Less: current portion of long-term debt	7,281	'	'	'	'	7,281	'	'	0
Due to Affiliate	20,000	'	'	'	'	20,000	'	'	0
Liabilities of Disposal Group, Including Discontinued Operation, Current	1,355	'	'	'	'	1,355	'	'	0
Accrued expenses and other current liabilities	17,548	'	'	'	'	17,548	'	'	9,619
Total current liabilities	65,101	'	'	'	'	65,101	'	'	32,180
Risk management liabilities	122	'	'	'	'	122	'	'	0
Asset retirement cost	34,440	'	'	'	'	34,440	'	'	8,319
Other Liabilities, Noncurrent	215	'	'	'	'	215	'	'	309
Long- term debt, excluding current maturities	124,888	'	'	'	'	124,888	'	'	128,285
Deferred Tax Liabilities, Gross	10,760	'	'	'	'	10,760	'	'	0
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	986	'	'	'	'	986	'	'	0
Total liabilities	236,512	'	'	'	'	236,512	'	'	169,093
Series A convertible preferred units	92,912	'	'	'	'	92,912	'	90,000	0
Partners' Capital	56,015	'	'	'	'	56,015	'	'	80,165
Non-controlling interest	7,400	'	'	'	'	7,400	'	'	7,438
Total liabilities and partners’ capital	63,415	'	'	'	'	63,415	'	'	87,603
Total liabilities, partners’ capital and non-controlling interest	392,839	'	'	'	'	392,839	'	'	256,696
Revenues:	'	'	'	'	'	'	'	'	'
Revenue	80,035	'	54,347	'	'	216,516	138,423	'	'
Loss on commodity derivatives, net	-499	'	-946	'	'	110	3,157	'	'
Total revenue	79,536	'	53,401	'	'	216,626	141,580	'	'
Natural Gas Midstream Costs	57,973	'	41,365	'	'	162,671	100,075	'	'
Direct Operating Costs	8,344	'	5,329	'	'	20,898	11,550	'	'
Selling, General and Administrative Expense	5,157	'	3,246	'	'	13,748	10,101	'	'
Allocated Share-based Compensation Expense	392	'	474	'	'	1,877	1,272	'	'
Depreciation	6,500	'	'	'	'	18,900	'	'	'
Operating Expenses:	'	'	'	'	'	'	'	'	'
Depreciation and Accretion Expense, Including Discontinued Operation	'	'	'	'	'	22,355	15,819	'	'
Depreciation, Depletion and Amortization	7,880	'	5,504	'	'	22,271	15,722	'	'
Total operating expenses	79,746	'	55,918	'	'	221,465	138,720	'	'
Gain on sale of assets, net	0	'	4	'	'	0	121	'	'
Loss on impairment of property, plant and equipment	0	-100	0	'	'	-15,232	0	'	'
Gain on involuntary conversion of property, plant and equipment	0	400	0	'	'	343	0	'	'
Operating (loss) income	-210	'	-2,513	'	'	-19,728	2,981	'	'
(Loss) earnings from consolidated affiliates	0	'	0	'	'	0	0	'	'
Other Income (expenses):	'	'	'	'	'	'	'	'	'
Interest Expense	2,636	'	1,501	'	'	6,958	3,083	'	'
Net (loss) income from continuing operations	-2,632	'	-4,014	'	'	-26,097	-102	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	-2,846	'	-4,014	'	'	-26,686	-102	'	'
Income Tax Expense (Benefit)	247	'	0	'	'	662	0	'	'
Income Tax Expense (Benefit), Continuing Operations	214	'	'	'	'	589	'	'	'
Income (loss) from operations of disposal groups	91	'	-12	'	'	-1,766	94	'	'
Net loss attributable to the Partnership	-2,731	'	-4,275	-4,275	'	-28,396	-257	'	'
Less: Comprehensive income attributable to noncontrolling interests	190	'	249	'	'	533	249	'	'
Net loss	-2,541	'	-4,026	'	'	-27,863	-8	'	'
Statement of Cash Flows [Abstract]	'	'	'	'	'	'	'	'	'
Net cash provided (used) in operating activities	'	'	'	'	'	15,587	16,476	'	'
Cash flows from investing activities	'	'	'	'	'	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	'	-22,842	-4,465	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	600	500	'	'	'	482	0	'	'
Proceeds from disposals of property, plant and equipment	'	'	'	'	'	0	126	'	'
Net contributions from affiliates	'	'	'	'	'	0	0	'	'
Net distributions to affiliates	'	'	'	'	'	0	0	'	'
Net cash provided (used) in investing activities	'	'	'	'	'	-22,360	-55,716	'	'
Cash flows from financing activities	'	'	'	'	'	'	'	'	'
Net contributions from affiliates	'	'	'	'	'	0	0	'	'
Net distributions to affiliates	'	'	'	'	'	0	0	'	'
Proceeds from Partnership Contribution	'	'	'	'	'	13,075	13	'	'
Unit holder distributions	'	'	'	'	'	-12,458	-12,050	'	'
Proceeds from Issuance of Convertible Preferred Units	'	'	'	'	'	14,393	0	'	'
Net distributions to non-controlling interest owners	'	'	'	'	'	-571	-249	'	'
LTIP tax netting unit repurchase	'	'	'	'	'	-400	-88	'	'
Deferred debt issuance costs	'	'	'	'	'	-1,509	-1,140	'	'
Payments on other debt	'	'	'	'	'	-2,231	0	'	'
Borrowings on other debt	'	'	'	'	'	1,495	0	'	'
Repayments of Other Debt	'	'	'	'	'	-1,072	0	'	'
Proceeds from Other Debt	'	'	'	'	'	6,200	0	'	'
Payments on long-term debt	'	'	'	'	'	-99,821	-42,310	'	'
Borrowings on long-term debt	'	'	'	'	'	92,571	94,690	'	'
Net cash provided (used) in financing activities	'	'	'	'	'	9,672	38,866	'	'
Net increase (decrease) in cash and cash equivalents	'	'	'	'	'	2,899	-374	'	'
Cash and Cash Equivalents	'	'	'	'	'	'	'	'	'
Beginning of period	'	576	497	'	871	576	871	'	'
End of period	3,473	'	497	497	497	3,473	497	'	'
Supplemental cash flow information	'	'	'	'	'	'	'	'	'
Interest payments	'	'	'	'	'	5,051	1,894	'	'
Supplemental non-cash information	'	'	'	'	'	'	'	'	'
Increase (decrease) in accrued property, plant and equipment	'	'	'	'	'	-6,080	808	'	'
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	'	'	'	'	'	59,995	0	'	'
Fair value of Series A Units in excess of value of contributed High Point System	0	'	'	0	0	15,612	0	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	'	2,912	0	'	'
Noncontrolling Interest, Ownership Percentage by Parent	87.40%	'	'	'	'	87.40%	'	'	'
Unrealized (loss) gain on post retirement benefit plan assets and liabilities	-34	'	23	'	'	-90	40	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-2,575	'	-4,003	'	'	-27,953	32	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	-2,765	'	-4,252	'	'	-28,486	-217	'	'
Parent Company [Member]	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	'	0	'	'	'	0	'	'
Current assets:	'	'	'	'	'	'	'	'	'
Accounts receivable	0	'	'	'	'	0	'	'	0
Unbilled revenue	0	'	'	'	'	0	'	'	0
Risk management assets	0	'	'	'	'	0	'	'	0
Other current assets	0	'	'	'	'	0	'	'	0
Assets Held-for-sale, Current	0	'	'	'	'	0	'	'	'
Total current assets	1	'	'	'	'	1	'	'	1
Property, plant and equipment, net	0	'	'	'	'	0	'	'	0
Noncurrent assets held for sale, net	0	'	'	'	'	0	'	'	'
Intangible Assets, Net (Excluding Goodwill)	0	'	'	'	'	0	'	'	'
Goodwill	0	'	'	'	'	0	'	'	'
Deferred Tax Assets, Gross	0	'	'	'	'	0	'	'	'
Investment in subsidiaries	149,782	'	'	'	'	149,782	'	'	80,164
Other assets	0	'	'	'	'	0	'	'	0
Total assets	149,783	'	'	'	'	149,783	'	'	80,165
Current liabilities:	'	'	'	'	'	'	'	'	'
Accounts payable	0	'	'	'	'	0	'	'	0
Accrued gas purchases	0	'	'	'	'	0	'	'	0
Risk management liabilities	856	'	'	'	'	856	'	'	'
Other debt	0	'	'	'	'	0	'	'	'
Risk management liabilities	0	'	'	'	'	0	'	'	'
Due to Affiliate	0	'	'	'	'	0	'	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Current	0	'	'	'	'	0	'	'	'
Accrued expenses and other current liabilities	'	'	'	'	'	'	'	'	0
Total current liabilities	856	'	'	'	'	856	'	'	0
Risk management liabilities	0	'	'	'	'	0	'	'	'
Asset retirement cost	0	'	'	'	'	0	'	'	0
Other Liabilities, Noncurrent	0	'	'	'	'	0	'	'	0
Long- term debt, excluding current maturities	0	'	'	'	'	0	'	'	0
Deferred Tax Liabilities, Gross	0	'	'	'	'	0	'	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	'	'	'	'	0	'	'	'
Total liabilities	856	'	'	'	'	856	'	'	0
Series A convertible preferred units	92,912	'	'	'	'	92,912	'	'	'
Partners' Capital	56,015	'	'	'	'	56,015	'	'	80,165
Non-controlling interest	0	'	'	'	'	0	'	'	0
Total liabilities and partners’ capital	56,015	'	'	'	'	56,015	'	'	80,165
Total liabilities, partners’ capital and non-controlling interest	149,783	'	'	'	'	149,783	'	'	80,165
Revenues:	'	'	'	'	'	'	'	'	'
Revenue	0	'	0	'	'	0	0	'	'
Loss on commodity derivatives, net	0	'	'	'	'	0	0	'	'
Total revenue	0	'	0	'	'	0	0	'	'
Natural Gas Midstream Costs	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	0	'	0	'	'	0	0	'	'
Operating Expenses:	'	'	'	'	'	'	'	'	'
Total operating expenses	0	'	0	'	'	0	0	'	'
Gain on sale of assets, net	'	'	'	'	'	'	'	'	'
Loss on impairment of property, plant and equipment	'	'	'	'	'	0	'	'	'
Gain on involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Operating (loss) income	0	'	0	'	'	0	0	'	'
(Loss) earnings from consolidated affiliates	-2,731	'	-4,275	'	'	-28,396	-257	'	'
Other Income (expenses):	'	'	'	'	'	'	'	'	'
Interest Expense	0	'	0	'	'	0	0	'	'
Net (loss) income from continuing operations	-2,731	'	-4,275	'	'	-28,396	-257	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	'	'	'	'	'	-28,396	'	'	'
Income Tax Expense (Benefit)	0	'	'	'	'	0	'	'	'
Income (loss) from operations of disposal groups	0	'	0	'	'	0	0	'	'
Net loss attributable to the Partnership	-2,731	'	-4,275	'	'	-28,396	-257	'	'
Less: Comprehensive income attributable to noncontrolling interests	0	'	0	'	'	0	0	'	'
Net loss	-2,731	'	-4,275	'	'	-28,396	-257	'	'
Statement of Cash Flows [Abstract]	'	'	'	'	'	'	'	'	'
Net cash provided (used) in operating activities	'	'	'	'	'	0	0	'	'
Cash flows from investing activities	'	'	'	'	'	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	'	0	0	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	'	0	0	'	'
Net contributions from affiliates	'	'	'	'	'	12,458	12,050	'	'
Net distributions to affiliates	'	'	'	'	'	27,468	13	'	'
Net cash provided (used) in investing activities	'	'	'	'	'	-15,010	12,037	'	'
Cash flows from financing activities	'	'	'	'	'	'	'	'	'
Net contributions from affiliates	'	'	'	'	'	0	0	'	'
Net distributions to affiliates	'	'	'	'	'	0	0	'	'
Proceeds from Partnership Contribution	'	'	'	'	'	13,075	13	'	'
Unit holder distributions	'	'	'	'	'	-12,458	-12,050	'	'
Proceeds from Issuance of Convertible Preferred Units	'	'	'	'	'	14,393	'	'	'
Net distributions to non-controlling interest owners	'	'	'	'	'	0	0	'	'
LTIP tax netting unit repurchase	'	'	'	'	'	0	0	'	'
Deferred debt issuance costs	'	'	'	'	'	0	0	'	'
Payments on other debt	'	'	'	'	'	0	'	'	'
Borrowings on other debt	'	'	'	'	'	0	'	'	'
Repayments of Other Debt	'	'	'	'	'	0	'	'	'
Proceeds from Other Debt	'	'	'	'	'	0	'	'	'
Payments on long-term debt	'	'	'	'	'	0	0	'	'
Borrowings on long-term debt	'	'	'	'	'	0	0	'	'
Net cash provided (used) in financing activities	'	'	'	'	'	15,010	-12,037	'	'
Net increase (decrease) in cash and cash equivalents	'	'	'	'	'	0	0	'	'
Cash and Cash Equivalents	'	'	'	'	'	'	'	'	'
Beginning of period	'	1	'	'	'	1	'	'	'
End of period	1	'	'	'	'	1	'	'	'
Supplemental cash flow information	'	'	'	'	'	'	'	'	'
Interest payments	'	'	'	'	'	0	0	'	'
Supplemental non-cash information	'	'	'	'	'	'	'	'	'
Increase (decrease) in accrued property, plant and equipment	'	'	'	'	'	0	0	'	'
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	'	'	'	'	'	59,995	'	'	'
Fair value of Series A Units in excess of value of contributed High Point System	'	'	'	'	'	15,612	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	'	2,912	'	'	'
Unrealized (loss) gain on post retirement benefit plan assets and liabilities	-34	'	23	'	'	-90	40	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-2,765	'	-4,252	'	'	-28,486	-217	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	-2,765	'	-4,252	'	'	-28,486	-217	'	'
Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'
Cash and cash equivalents, including discontinued operations	3,474	'	'	'	'	3,474	'	'	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	'	-51,377	'	'	'	-51,377	'	'
Current assets:	'	'	'	'	'	'	'	'	'
Accounts receivable	4,144	'	'	'	'	4,144	'	'	1,612
Unbilled revenue	20,107	'	'	'	'	20,107	'	'	18,102
Risk management assets	1,050	'	'	'	'	1,050	'	'	969
Other current assets	4,753	'	'	'	'	4,753	'	'	2,967
Assets Held-for-sale, Current	1,276	'	'	'	'	1,276	'	'	'
Total current assets	34,802	'	'	'	'	34,802	'	'	24,225
Property, plant and equipment, net	257,864	'	'	'	'	257,864	'	'	165,001
Noncurrent assets held for sale, net	3,016	'	'	'	'	3,016	'	'	'
Intangible Assets, Net (Excluding Goodwill)	4,351	'	'	'	'	4,351	'	'	'
Goodwill	16,447	'	'	'	'	16,447	'	'	'
Deferred Tax Assets, Gross	5,741	'	'	'	'	5,741	'	'	'
Investment in subsidiaries	53,607	'	'	'	'	53,607	'	'	51,613
Other assets	6,202	'	'	'	'	6,202	'	'	4,636
Total assets	382,030	'	'	'	'	382,030	'	'	245,475
Current liabilities:	'	'	'	'	'	'	'	'	'
Accounts payable	2,038	'	'	'	'	2,038	'	'	5,100
Accrued gas purchases	13,706	'	'	'	'	13,706	'	'	14,606
Risk management liabilities	16,576	'	'	'	'	16,576	'	'	'
Other debt	7,281	'	'	'	'	7,281	'	'	'
Risk management liabilities	349	'	'	'	'	349	'	'	'
Due to Affiliate	20,000	'	'	'	'	20,000	'	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Current	1,355	'	'	'	'	1,355	'	'	'
Accrued expenses and other current liabilities	'	'	'	'	'	'	'	'	9,150
Total current liabilities	61,305	'	'	'	'	61,305	'	'	28,856
Risk management liabilities	122	'	'	'	'	122	'	'	'
Asset retirement cost	33,972	'	'	'	'	33,972	'	'	7,861
Other Liabilities, Noncurrent	215	'	'	'	'	215	'	'	309
Long- term debt, excluding current maturities	124,888	'	'	'	'	124,888	'	'	128,285
Deferred Tax Liabilities, Gross	10,760	'	'	'	'	10,760	'	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	986	'	'	'	'	986	'	'	'
Total liabilities	232,248	'	'	'	'	232,248	'	'	165,311
Series A convertible preferred units	0	'	'	'	'	0	'	'	'
Partners' Capital	149,782	'	'	'	'	149,782	'	'	80,164
Non-controlling interest	0	'	'	'	'	0	'	'	0
Total liabilities and partners’ capital	149,782	'	'	'	'	149,782	'	'	80,164
Total liabilities, partners’ capital and non-controlling interest	382,030	'	'	'	'	382,030	'	'	245,475
Revenues:	'	'	'	'	'	'	'	'	'
Revenue	66,363	'	39,346	'	'	179,059	123,422	'	'
Loss on commodity derivatives, net	-499	'	-946	'	'	110	3,157	'	'
Total revenue	65,864	'	38,400	'	'	179,169	126,579	'	'
Natural Gas Midstream Costs	47,361	'	30,194	'	'	134,041	88,904	'	'
Direct Operating Costs	7,138	'	4,351	'	'	17,490	10,572	'	'
Selling, General and Administrative Expense	5,157	'	3,150	'	'	13,748	10,005	'	'
Allocated Share-based Compensation Expense	392	'	474	'	'	1,877	1,272	'	'
Depreciation	7,465	'	5,102	'	'	21,028	15,320	'	'
Operating Expenses:	'	'	'	'	'	'	'	'	'
Total operating expenses	67,513	'	43,271	'	'	188,184	126,073	'	'
Gain on sale of assets, net	'	'	4	'	'	'	121	'	'
Loss on impairment of property, plant and equipment	'	'	'	'	'	-15,232	'	'	'
Gain on involuntary conversion of property, plant and equipment	'	'	'	'	'	343	'	'	'
Operating (loss) income	-1,649	'	-4,867	'	'	-23,904	627	'	'
(Loss) earnings from consolidated affiliates	1,249	'	2,105	'	'	3,643	2,105	'	'
Other Income (expenses):	'	'	'	'	'	'	'	'	'
Interest Expense	2,636	'	1,501	'	'	6,958	3,083	'	'
Net (loss) income from continuing operations	-2,822	'	-4,263	'	'	-26,630	-351	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	'	'	'	'	'	-27,219	'	'	'
Income Tax Expense (Benefit)	214	'	'	'	'	589	'	'	'
Income (loss) from operations of disposal groups	91	'	-12	'	'	-1,766	94	'	'
Net loss attributable to the Partnership	-2,731	'	-4,275	'	'	-28,396	-257	'	'
Less: Comprehensive income attributable to noncontrolling interests	0	'	0	'	'	0	0	'	'
Net loss	-2,731	'	-4,275	'	'	-28,396	-257	'	'
Statement of Cash Flows [Abstract]	'	'	'	'	'	'	'	'	'
Net cash provided (used) in operating activities	'	'	'	'	'	11,413	14,122	'	'
Cash flows from investing activities	'	'	'	'	'	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	'	-22,841	-4,196	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	'	482	126	'	'
Net contributions from affiliates	'	'	'	'	'	0	0	'	'
Net distributions to affiliates	'	'	'	'	'	0	0	'	'
Net cash provided (used) in investing activities	'	'	'	'	'	-22,359	-55,447	'	'
Cash flows from financing activities	'	'	'	'	'	'	'	'	'
Net contributions from affiliates	'	'	'	'	'	27,468	13	'	'
Net distributions to affiliates	'	'	'	'	'	-8,856	-10,214	'	'
Proceeds from Partnership Contribution	'	'	'	'	'	0	0	'	'
Unit holder distributions	'	'	'	'	'	0	0	'	'
Proceeds from Issuance of Convertible Preferred Units	'	'	'	'	'	0	'	'	'
Net distributions to non-controlling interest owners	'	'	'	'	'	0	0	'	'
LTIP tax netting unit repurchase	'	'	'	'	'	-400	-88	'	'
Deferred debt issuance costs	'	'	'	'	'	-1,509	-1,140	'	'
Payments on other debt	'	'	'	'	'	-2,231	'	'	'
Borrowings on other debt	'	'	'	'	'	1,495	'	'	'
Repayments of Other Debt	'	'	'	'	'	-1,072	'	'	'
Proceeds from Other Debt	'	'	'	'	'	6,200	'	'	'
Payments on long-term debt	'	'	'	'	'	-99,821	-42,310	'	'
Borrowings on long-term debt	'	'	'	'	'	92,571	94,690	'	'
Net cash provided (used) in financing activities	'	'	'	'	'	13,845	40,951	'	'
Net increase (decrease) in cash and cash equivalents	'	'	'	'	'	2,899	-374	'	'
Cash and Cash Equivalents	'	'	'	'	'	'	'	'	'
Beginning of period	'	575	'	'	870	575	870	'	'
End of period	3,472	'	496	'	'	3,472	496	'	'
Supplemental cash flow information	'	'	'	'	'	'	'	'	'
Interest payments	'	'	'	'	'	5,051	1,894	'	'
Supplemental non-cash information	'	'	'	'	'	'	'	'	'
Increase (decrease) in accrued property, plant and equipment	'	'	'	'	'	-6,080	808	'	'
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	'	'	'	'	'	0	'	'	'
Fair value of Series A Units in excess of value of contributed High Point System	'	'	'	'	'	0	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	'	0	'	'	'
Unrealized (loss) gain on post retirement benefit plan assets and liabilities	-34	'	23	'	'	-90	40	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-2,765	'	-4,252	'	'	-28,486	-217	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	-2,765	'	-4,252	'	'	-28,486	-217	'	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	'	0	'	'	'	0	'	'
Current assets:	'	'	'	'	'	'	'	'	'
Accounts receivable	1,502	'	'	'	'	1,502	'	'	346
Unbilled revenue	3,649	'	'	'	'	3,649	'	'	3,410
Risk management assets	0	'	'	'	'	0	'	'	0
Other current assets	473	'	'	'	'	473	'	'	259
Assets Held-for-sale, Current	0	'	'	'	'	0	'	'	'
Total current assets	5,624	'	'	'	'	5,624	'	'	4,015
Property, plant and equipment, net	58,791	'	'	'	'	58,791	'	'	58,818
Noncurrent assets held for sale, net	0	'	'	'	'	0	'	'	'
Intangible Assets, Net (Excluding Goodwill)	0	'	'	'	'	0	'	'	'
Goodwill	0	'	'	'	'	0	'	'	'
Deferred Tax Assets, Gross	0	'	'	'	'	0	'	'	'
Investment in subsidiaries	0	'	'	'	'	0	'	'	0
Other assets	0	'	'	'	'	0	'	'	0
Total assets	64,415	'	'	'	'	64,415	'	'	62,833
Current liabilities:	'	'	'	'	'	'	'	'	'
Accounts payable	210	'	'	'	'	210	'	'	427
Accrued gas purchases	2,614	'	'	'	'	2,614	'	'	2,428
Risk management liabilities	116	'	'	'	'	116	'	'	'
Other debt	0	'	'	'	'	0	'	'	'
Risk management liabilities	0	'	'	'	'	0	'	'	'
Due to Affiliate	0	'	'	'	'	0	'	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Current	0	'	'	'	'	0	'	'	'
Accrued expenses and other current liabilities	'	'	'	'	'	'	'	'	469
Total current liabilities	2,940	'	'	'	'	2,940	'	'	3,324
Risk management liabilities	0	'	'	'	'	0	'	'	'
Asset retirement cost	468	'	'	'	'	468	'	'	458
Other Liabilities, Noncurrent	0	'	'	'	'	0	'	'	0
Long- term debt, excluding current maturities	0	'	'	'	'	0	'	'	0
Deferred Tax Liabilities, Gross	0	'	'	'	'	0	'	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	'	'	'	'	0	'	'	'
Total liabilities	3,408	'	'	'	'	3,408	'	'	3,782
Series A convertible preferred units	0	'	'	'	'	0	'	'	'
Partners' Capital	53,607	'	'	'	'	53,607	'	'	51,613
Non-controlling interest	7,400	'	'	'	'	7,400	'	'	7,438
Total liabilities and partners’ capital	61,007	'	'	'	'	61,007	'	'	59,051
Total liabilities, partners’ capital and non-controlling interest	64,415	'	'	'	'	64,415	'	'	62,833
Revenues:	'	'	'	'	'	'	'	'	'
Revenue	14,562	'	'	'	'	41,818	15,371	'	'
Loss on commodity derivatives, net	0	'	0	'	'	0	0	'	'
Total revenue	14,562	'	15,371	'	'	41,818	15,371	'	'
Natural Gas Midstream Costs	11,502	'	11,541	'	'	32,991	11,541	'	'
Direct Operating Costs	1,206	'	978	'	'	3,408	978	'	'
Selling, General and Administrative Expense	0	'	96	'	'	0	96	'	'
Allocated Share-based Compensation Expense	0	'	0	'	'	0	0	'	'
Depreciation	415	'	402	'	'	1,243	402	'	'
Operating Expenses:	'	'	'	'	'	'	'	'	'
Total operating expenses	13,123	'	13,017	'	'	37,642	13,017	'	'
Gain on sale of assets, net	'	'	'	'	'	'	'	'	'
Loss on impairment of property, plant and equipment	'	'	'	'	'	0	'	'	'
Gain on involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Operating (loss) income	1,439	'	2,354	'	'	4,176	2,354	'	'
(Loss) earnings from consolidated affiliates	0	'	0	'	'	0	0	'	'
Other Income (expenses):	'	'	'	'	'	'	'	'	'
Interest Expense	0	'	0	'	'	0	0	'	'
Net (loss) income from continuing operations	1,439	'	2,354	'	'	4,176	2,354	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	'	'	'	'	'	4,176	'	'	'
Income Tax Expense (Benefit)	0	'	'	'	'	0	'	'	'
Income (loss) from operations of disposal groups	0	'	0	'	'	0	0	'	'
Net loss attributable to the Partnership	1,249	'	2,105	'	'	3,643	2,105	'	'
Less: Comprehensive income attributable to noncontrolling interests	190	'	249	'	'	533	249	'	'
Net loss	1,439	'	2,354	'	'	4,176	2,354	'	'
Statement of Cash Flows [Abstract]	'	'	'	'	'	'	'	'	'
Net cash provided (used) in operating activities	'	'	'	'	'	4,174	2,354	'	'
Cash flows from investing activities	'	'	'	'	'	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	'	-1	-269	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	'	0	0	'	'
Net contributions from affiliates	'	'	'	'	'	0	0	'	'
Net distributions to affiliates	'	'	'	'	'	0	0	'	'
Net cash provided (used) in investing activities	'	'	'	'	'	-1	-269	'	'
Cash flows from financing activities	'	'	'	'	'	'	'	'	'
Net contributions from affiliates	'	'	'	'	'	0	0	'	'
Net distributions to affiliates	'	'	'	'	'	-3,602	-1,836	'	'
Proceeds from Partnership Contribution	'	'	'	'	'	0	0	'	'
Unit holder distributions	'	'	'	'	'	0	0	'	'
Proceeds from Issuance of Convertible Preferred Units	'	'	'	'	'	0	'	'	'
Net distributions to non-controlling interest owners	'	'	'	'	'	-571	-249	'	'
LTIP tax netting unit repurchase	'	'	'	'	'	0	0	'	'
Deferred debt issuance costs	'	'	'	'	'	0	0	'	'
Payments on other debt	'	'	'	'	'	0	'	'	'
Borrowings on other debt	'	'	'	'	'	0	'	'	'
Repayments of Other Debt	'	'	'	'	'	0	'	'	'
Proceeds from Other Debt	'	'	'	'	'	0	'	'	'
Payments on long-term debt	'	'	'	'	'	0	0	'	'
Borrowings on long-term debt	'	'	'	'	'	0	0	'	'
Net cash provided (used) in financing activities	'	'	'	'	'	-4,173	-2,085	'	'
Net increase (decrease) in cash and cash equivalents	'	'	'	'	'	0	0	'	'
Cash and Cash Equivalents	'	'	'	'	'	'	'	'	'
Beginning of period	'	0	'	'	'	0	'	'	'
End of period	0	'	'	'	'	0	'	'	'
Supplemental cash flow information	'	'	'	'	'	'	'	'	'
Interest payments	'	'	'	'	'	0	0	'	'
Supplemental non-cash information	'	'	'	'	'	'	'	'	'
Increase (decrease) in accrued property, plant and equipment	'	'	'	'	'	0	0	'	'
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	'	'	'	'	'	0	'	'	'
Fair value of Series A Units in excess of value of contributed High Point System	'	'	'	'	'	0	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	'	0	'	'	'
Unrealized (loss) gain on post retirement benefit plan assets and liabilities	0	'	0	'	'	0	0	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	1,439	'	2,354	'	'	4,176	2,354	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	1,249	'	2,105	'	'	3,643	2,105	'	'
Consolidation, Eliminations [Member]	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	'	0	'	'	'	0	'	'
Current assets:	'	'	'	'	'	'	'	'	'
Accounts receivable	0	'	'	'	'	0	'	'	0
Unbilled revenue	0	'	'	'	'	0	'	'	0
Risk management assets	0	'	'	'	'	0	'	'	0
Other current assets	0	'	'	'	'	0	'	'	0
Assets Held-for-sale, Current	0	'	'	'	'	0	'	'	'
Total current assets	0	'	'	'	'	0	'	'	0
Property, plant and equipment, net	0	'	'	'	'	0	'	'	0
Noncurrent assets held for sale, net	0	'	'	'	'	0	'	'	'
Intangible Assets, Net (Excluding Goodwill)	0	'	'	'	'	0	'	'	'
Goodwill	0	'	'	'	'	0	'	'	'
Deferred Tax Assets, Gross	0	'	'	'	'	0	'	'	'
Investment in subsidiaries	-203,389	'	'	'	'	-203,389	'	'	-131,777
Other assets	0	'	'	'	'	0	'	'	0
Total assets	-203,389	'	'	'	'	-203,389	'	'	-131,777
Current liabilities:	'	'	'	'	'	'	'	'	'
Accounts payable	0	'	'	'	'	0	'	'	0
Accrued gas purchases	0	'	'	'	'	0	'	'	0
Risk management liabilities	0	'	'	'	'	0	'	'	'
Other debt	0	'	'	'	'	0	'	'	'
Risk management liabilities	0	'	'	'	'	0	'	'	'
Due to Affiliate	0	'	'	'	'	0	'	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Current	0	'	'	'	'	0	'	'	'
Accrued expenses and other current liabilities	'	'	'	'	'	'	'	'	0
Total current liabilities	0	'	'	'	'	0	'	'	0
Risk management liabilities	0	'	'	'	'	0	'	'	'
Asset retirement cost	0	'	'	'	'	0	'	'	0
Other Liabilities, Noncurrent	0	'	'	'	'	0	'	'	0
Long- term debt, excluding current maturities	0	'	'	'	'	0	'	'	0
Deferred Tax Liabilities, Gross	0	'	'	'	'	0	'	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent	0	'	'	'	'	0	'	'	'
Total liabilities	0	'	'	'	'	0	'	'	0
Series A convertible preferred units	0	'	'	'	'	0	'	'	'
Partners' Capital	-203,389	'	'	'	'	-203,389	'	'	-131,777
Non-controlling interest	0	'	'	'	'	0	'	'	0
Total liabilities and partners’ capital	-203,389	'	'	'	'	-203,389	'	'	-131,777
Total liabilities, partners’ capital and non-controlling interest	-203,389	'	'	'	'	-203,389	'	'	-131,777
Revenues:	'	'	'	'	'	'	'	'	'
Revenue	-890	'	-370	'	'	-4,361	-370	'	'
Loss on commodity derivatives, net	0	'	0	'	'	0	0	'	'
Total revenue	-890	'	-370	'	'	-4,361	-370	'	'
Natural Gas Midstream Costs	-890	'	-370	'	'	-4,361	-370	'	'
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	0	'	0	'	'	0	0	'	'
Operating Expenses:	'	'	'	'	'	'	'	'	'
Total operating expenses	-890	'	-370	'	'	-4,361	-370	'	'
Gain on sale of assets, net	'	'	'	'	'	'	'	'	'
Loss on impairment of property, plant and equipment	'	'	'	'	'	0	'	'	'
Gain on involuntary conversion of property, plant and equipment	'	'	'	'	'	0	'	'	'
Operating (loss) income	0	'	0	'	'	0	0	'	'
(Loss) earnings from consolidated affiliates	1,482	'	2,170	'	'	24,753	-1,848	'	'
Other Income (expenses):	'	'	'	'	'	'	'	'	'
Interest Expense	0	'	0	'	'	0	0	'	'
Net (loss) income from continuing operations	1,482	'	2,170	'	'	24,753	-1,848	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	'	'	'	'	'	24,753	'	'	'
Income Tax Expense (Benefit)	0	'	'	'	'	0	'	'	'
Income (loss) from operations of disposal groups	0	'	0	'	'	0	0	'	'
Net loss attributable to the Partnership	1,482	'	2,170	'	'	24,753	-1,848	'	'
Less: Comprehensive income attributable to noncontrolling interests	0	'	0	'	'	0	0	'	'
Net loss	1,482	'	2,170	'	'	24,753	-1,848	'	'
Statement of Cash Flows [Abstract]	'	'	'	'	'	'	'	'	'
Net cash provided (used) in operating activities	'	'	'	'	'	0	0	'	'
Cash flows from investing activities	'	'	'	'	'	'	'	'	'
Additions to property, plant and equipment	'	'	'	'	'	0	0	'	'
Insurance proceeds from involuntary conversion of property, plant and equipment	'	'	'	'	'	0	0	'	'
Net contributions from affiliates	'	'	'	'	'	-12,458	-12,050	'	'
Net distributions to affiliates	'	'	'	'	'	-27,468	-13	'	'
Net cash provided (used) in investing activities	'	'	'	'	'	15,010	-12,037	'	'
Cash flows from financing activities	'	'	'	'	'	'	'	'	'
Net contributions from affiliates	'	'	'	'	'	-27,468	-13	'	'
Net distributions to affiliates	'	'	'	'	'	12,458	12,050	'	'
Proceeds from Partnership Contribution	'	'	'	'	'	0	0	'	'
Unit holder distributions	'	'	'	'	'	0	0	'	'
Proceeds from Issuance of Convertible Preferred Units	'	'	'	'	'	0	'	'	'
Net distributions to non-controlling interest owners	'	'	'	'	'	0	0	'	'
LTIP tax netting unit repurchase	'	'	'	'	'	0	0	'	'
Deferred debt issuance costs	'	'	'	'	'	0	0	'	'
Payments on other debt	'	'	'	'	'	0	'	'	'
Borrowings on other debt	'	'	'	'	'	0	'	'	'
Repayments of Other Debt	'	'	'	'	'	0	'	'	'
Proceeds from Other Debt	'	'	'	'	'	0	'	'	'
Payments on long-term debt	'	'	'	'	'	0	0	'	'
Borrowings on long-term debt	'	'	'	'	'	0	0	'	'
Net cash provided (used) in financing activities	'	'	'	'	'	-15,010	12,037	'	'
Net increase (decrease) in cash and cash equivalents	'	'	'	'	'	0	0	'	'
Cash and Cash Equivalents	'	'	'	'	'	'	'	'	'
Beginning of period	'	0	'	'	'	0	'	'	'
End of period	0	'	'	'	'	0	'	'	'
Supplemental cash flow information	'	'	'	'	'	'	'	'	'
Interest payments	'	'	'	'	'	0	0	'	'
Supplemental non-cash information	'	'	'	'	'	'	'	'	'
Increase (decrease) in accrued property, plant and equipment	'	'	'	'	'	0	0	'	'
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	'	'	'	'	'	0	'	'	'
Fair value of Series A Units in excess of value of contributed High Point System	'	'	'	'	'	0	'	'	'
Accrued and in-kind unitholder distribution for Series A Units	'	'	'	'	'	0	'	'	'
Unrealized (loss) gain on post retirement benefit plan assets and liabilities	34	'	-23	'	'	90	-40	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	1,516	'	2,147	'	'	24,843	-1,888	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	1,516	'	2,147	'	'	24,843	-1,888	'	'
Terminals [Member]	'	'	'	'	'	'	'	'	'
Revenues:	'	'	'	'	'	'	'	'	'
Revenue	'	'	'	'	'	6,326	'	'	'
Loss on commodity derivatives, net	0	'	'	'	'	0	'	'	'
Total revenue	3,458	'	'	'	'	6,326	'	'	'
Natural Gas Midstream Costs	0	'	'	'	'	0	'	'	'
Direct Operating Costs	630	'	'	'	'	1,261	'	'	'
Other Income (expenses):	'	'	'	'	'	'	'	'	'
Net (loss) income from continuing operations	-122	'	0	'	'	-536	0	'	'
Net loss attributable to the Partnership	-175	'	'	0	'	-650	0	'	'
Supplemental non-cash information	'	'	'	'	'	'	'	'	'
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	'	'	'	'	'	22,129	0	'	'
Terminals [Member] | Parent Company [Member]	'	'	'	'	'	'	'	'	'
Supplemental non-cash information	'	'	'	'	'	'	'	'	'
Net assets contributed in exchange for the issuance of Series A convertible preferred units (see Note 3)	'	'	'	'	'	$22,129	'	'	'

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	0 Months Ended		3 Months Ended
In Thousands, except Share data, unless otherwise specified	Aug. 08, 2013	Sep. 30, 2013	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Aug. 14, 2013	Jul. 23, 2013	Sep. 30, 2013
						Subsequent Event [Member]	Subsequent Event [Member]	General Partner [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'
Distribution announced	'	'	'	'	'	$1.81	$0.45	'
Cash Distribution	'	$1,301	$0	$0	$2,375	'	'	'
Incentive Distribution Right, After Minimum Quarterly Distributions, Percent	'	'	'	'	'	'	'	48.00%
General partner's warrants to purchase	300,000	'	'	'	'	'	'	'
Warrant exercise price	0.01	'	'	'	'	'	'	'
Warrant exercisable after period	'18 months	'	'	'	'	'	'	'
Warrants exercisable if the volume weighted average closing price of the common units exceed	25	'	'	'	'	'	'	'
Warrants exercisable if the exeeded price per share is traded on a consecutive basis	'30 days	'	'	'	'	'	'	'

Liquidity_Details

Liquidity (Details) (USD $)

9 Months Ended

3 Months Ended

0 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Sep. 30, 2013

Sep. 30, 2013

Apr. 15, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Apr. 15, 2013

Sep. 30, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Apr. 15, 2013

Jul. 31, 2013

Third Amendment [Member]

Third Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Eurodollar [Member]

Eurodollar [Member]

Base Rate [Member]

Base Rate [Member]

Eurodollar [Member]

Third Amendment [Member]

Third Amendment [Member]

Third Amendment [Member]

Third Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Fourth Amendment [Member]

Revolving Credit Facility [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Federal Funds [Member]

Eurodollar [Member]

Fiscal Quarter Ending December 31, 2014 [Member]

Fiscal Quarter Ending June 30, 2013 [Member]

Fiscal Quarter Ending Semptember 30, 2013 [Member]

Fiscal Quarter Ending December 31, 2013 [Member]

Fiscal Quarter Ending March 31, 2014 [Member]

Fiscal Quarter Ending June 30, 2014 [Member]

Fiscal Quarter Ending September 30, 2014 [Member]

Fiscal Quarter Ending December 31, 2014 [Member]

Fiscal Quarter Ending March 31, 2015 and thereafter [Member]

Fourth Amendment [Member]

Fiscal Quarter Ending December 31, 2014 [Member]

Fiscal Quarter Ending December 31, 2014 [Member]

Fiscal Quarter Ending December 31, 2014 [Member]

Fiscal Quarter Ending December 31, 2014 [Member]

Liquidity Disclosures [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Leverage ratio requirement

4.5

'

4.5

4

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.9

5.9

5.75

5.75

5.75

5.5

5.25

4.5

'

Total indebtedness

$130,900,000

'

$130,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ratio of indebtedness to net capital

5.7

'

5.7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility, amount outstanding limit

'

'

'

'

'

'

'

'

'

'

'

'

'

150,000,000

'

'

175,000,000

'

200,000,000

'

'

'

'

'

'

'

'

'

Equity contribution, to increase borrowings limit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,500,000

'

'

'

'

'

'

'

'

'

'

'

Description of variable rate basis

'

'

'

'

'

'

'Eurodollar

'

'base rate

'

'

'Eurodollar Rate

'

'

'Eurodollar rate

'

'

'

'

'

'

'

'

'

'

'

'

'

Facility fee (percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.50%

'

'

'

'

'

'

'

'

'

'

'

'

Additional fees

'

'

'

'

'

'

'

'

'

'

0.13%

'

'

'

'

0.13%

'

'

'

'

'

'

'

'

'

'

'

'

Payments on long-term debt

99,821,000

42,310,000

'

'

'

'

'

'

'

'

'

'

12,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount outstanding

-121,035,000

'

-128,285,000

'

'

'

'

'

'

'

'

'

'

'

'

'

-130,000,000

-123,700,000

'

'

'

'

'

'

'

'

'

-129,200,000

Remaining borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

45,000,000

39,300,000

'

'

'

'

'

'

'

'

'

'

Maximum outstanding borrowings under credit facility

'

'

'

'

'

'

'

'

'

'

150,000,000

'

'

'

'

'

175,000,000

'

'

'

'

'

'

'

'

'

'

'

Basis spread on variable rate

'

'

'

'

'

'

2.50%

4.75%

1.50%

3.75%

'

0.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partnership cancellation of subordinated units (percent)

'

'

'

'

'

20.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Quarterly dividend reduction

'

'

'

'

'

$400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Subsequent_Events_Equity_offer

Subsequent Events Equity offering (Details) (USD $)	Dec. 11, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, except Share data, unless otherwise specified
Subsequent Events [Abstract]	'	'	'
Limited Partners' Capital Account, Units Issued	2,400,000	9,209,000	9,165,000
Sale of Stock, Price Per Share	$22.47	'	'
Business Acquisition, Cost of Acquired Entity, Purchase Price	$60	'	'

Goodwill_and_intangible_assets2

Goodwill and intangible assets (Details) (USD $)	3 Months Ended	9 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Jun. 30, 2013	Jun. 30, 2013
				Minimum [Member]	Maximum [Member]
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Amortization of Intangible Assets	$1,200,000	$3,000,000	'	'	'
Finite-Lived Intangible Assets, Gross	12,082,000	12,082,000	'	'	'
Finite-Lived Intangible Assets, Accumulated Amortization	-7,731,000	-7,731,000	'	'	'
Intangible Assets, Net (Excluding Goodwill)	$4,351,000	$4,351,000	$0	'	'
Finite-Lived Intangible Asset, Useful Life	'	'	'	'0 years 5 months 0 days	'0 years 35 months 0 days

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Unbilled revenue	$23,756,000	'	$23,756,000	'	$21,512,000
Noncurrent assets held for sale, net	3,016,000	'	3,016,000	'	0
Liabilities of Disposal Group, Including Discontinued Operation, Current	1,355,000	'	1,355,000	'	0
Loss on impairment of noncurrent assets held for sale	'	'	1,807,000	0	'
Assumed discount rate	0.00%	'	'	'	'
Assets Held-for-sale, Current	1,276,000	'	1,276,000	'	0
Property, Plant and Equipment, Net	316,655,000	'	316,655,000	'	223,819,000
Gas Purchase Payable, Current	16,320,000	'	16,320,000	'	17,034,000
Income (loss) from operations of disposal groups	91,000	-12,000	-1,766,000	94,000	'
Gathering and Processing Assets [Member]	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Disposal Group, Including Discontinued Operation, Revenue	3,800,000	2,923,000	11,395,000	8,515,000	'
Assets Held-for-sale, Long Lived	900,000	'	900,000	'	'
Disposal Group, Including Discontinued Operation, Operating Expense	3,709,000	2,935,000	11,354,000	8,421,000	'
Disposal Group, Including Discontinued Operation, Impairment	0	0	1,807,000	0	'
Income (loss) from operations of disposal groups	91,000	-12,000	-1,766,000	94,000	'
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic	0.02	0	-0.19	0.01	'
Terminals [Member]	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Noncurrent assets held for sale, net	2,100,000	'	2,100,000	'	'
Liabilities of Disposal Group, Including Discontinued Operation, Current	400,000	'	400,000	'	'
Assets Held-for-sale, Current	100,000	'	100,000	'	'
Income Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Gathering and Processing Assets [Member]	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Assumed discount rate	0.00%	'	'	'	'
Decline in throughput volumes, rate	2.50%	'	'	'	'
Discounted Cash Flow Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Gathering and Processing Assets [Member]	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Disposal Group, Including Discontinued Operation, Impairment	$1,800,000	'	'	'	'

Income_Tax_Details

Income Tax (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'	'	'	'
Current Income Tax Expense (Benefit)	$0	'	$0	'
Current Federal Tax Expense (Benefit)	143	'	446	'
Current State and Local Tax Expense (Benefit)	21	'	66	'
Effective Income Tax Rate Reconciliation, Tax Exempt Income	85	'	152	'
Income Tax Reconciliation, Other Adjustments	-1	'	-2	'
Income Tax Expense (Benefit)	247	0	662	0
Discontinued Operation, Tax Effect of Discontinued Operation	-34	'	-73	'
Effective Income Tax Rate, Continuing Operations	0.00%	'	0.00%	'
Income Tax Expense (Benefit), Continuing Operations	$214	'	$589	'