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ORGANIZATION, BUSINESS OPERATIONS AND BASIS OF PRESENTATION (Details) (USD $)
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0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | |||||||||||||||
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Oct. 03, 2012
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Jun. 30, 2013
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Dec. 31, 2013
segment
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Dec. 31, 2012
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Dec. 31, 2011
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Oct. 03, 2012
Predecessor
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Oct. 03, 2012
Holdings
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Oct. 03, 2012
DFW Midstream
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Oct. 03, 2012
Grand River Gathering, LLC
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Mar. 31, 2013
Summit Midstream Partners Holdings, LLC
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Dec. 31, 2013
SMP Holdings
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Dec. 31, 2013
Common units
SMP Holdings
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Dec. 31, 2013
Subordinated units
SMP Holdings
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Jun. 04, 2013
General partner
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Oct. 03, 2012
General partner
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Mar. 31, 2013
General partner
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Oct. 03, 2012
Limited Partner
Common units
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Oct. 03, 2012
Limited Partner
Common units
Predecessor
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Oct. 03, 2012
Limited Partner
Subordinated units
Predecessor
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Oct. 03, 2012
Director
Predecessor
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Oct. 03, 2012
Director
Common units
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Dec. 31, 2013
Phantom Units
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Dec. 31, 2012
Phantom Units
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Oct. 03, 2012
Phantom Units
Employees
Predecessor
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Oct. 03, 2012
Revolving credit facility
Predecessor
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| ORGANIZATION AND BUSINESS OPERATIONS | |||||||||||||||||||||||||
| Cumulative percentage ownership after all transactions | 100.00% | 100.00% | 100.00% | ||||||||||||||||||||||
| General partner interest (as a percent) | 2.00% | 2.00% | 2.00% | ||||||||||||||||||||||
| Limited partner interest (as a percent) | 100.00% | 20.10% | 49.00% | ||||||||||||||||||||||
| Common limited partner capital, units outstanding | 29,079,866 | 24,412,427 | 14,691,397 | 24,409,850 | |||||||||||||||||||||
| General partner interests, units outstanding | 1,091,453 | 996,320 | 1,091,453 | ||||||||||||||||||||||
| General partner units | 996,320 | 10,029,850 | 24,409,850 | ||||||||||||||||||||||
| Units sold to public for cash in connection with the exercise of the underwriters' option to purchase additional common units | 1,875,000 | ||||||||||||||||||||||||
| Distributions made to reimburse for certain capital expenditures | $ 88,000,000 | ||||||||||||||||||||||||
| Units granted in connection with IPO pursuant to LTIP | 5,000 | 155,330 | 125,000 | 125,000 | |||||||||||||||||||||
| Number of related persons to whom common units were granted | 2 | ||||||||||||||||||||||||
| Common units sold in public offering | 14,380,000 | 14,375,000 | |||||||||||||||||||||||
| Limited partner interest sold in public offering (as a percent) | 28.90% | ||||||||||||||||||||||||
| Net proceeds from the IPO | 269,400,000 | 0 | 263,125,000 | 0 | |||||||||||||||||||||
| Repayment of indebtedness | 294,200,000 | 294,180,000 | 160,770,000 | 0 | 140,000,000 | ||||||||||||||||||||
| Distributions made in connection with underwriters exercising option to purchase additional units | 35,100,000 | ||||||||||||||||||||||||
| Estimated IPO expenses | $ 6,300,000 | ||||||||||||||||||||||||
| Number of operating segments | 4 | ||||||||||||||||||||||||
| Number of reportable segments | 1 | ||||||||||||||||||||||||