Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014 Common units	Jul. 31, 2014 Subordinated Units	Jul. 31, 2014 General Partner Units
Entity Registrant Name	Summit Midstream Partners, LP
Entity Central Index Key	0001549922
Document Type	10-Q
Document Period End Date	Jun. 30, 2014
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		34,423,369	24,409,850	1,200,651
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2