<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>519</ContextCount>
  <ElementCount>518</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>129</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - COVER PAGE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/COVERPAGE</Role>
      <ShortName>COVER PAGE</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - AUDIT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/AUDITINFORMATION</Role>
      <ShortName>AUDIT INFORMATION</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONSOLIDATED STATEMENTS EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/CONSOLIDATEDSTATEMENTSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Disclosure - ORGANIZATION, CORPORATE REORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/ORGANIZATIONCORPORATEREORGANIZATIONBUSINESSOPERATIONSANDPRESENTATIONANDCONSOLIDATION</Role>
      <ShortName>ORGANIZATION, CORPORATE REORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTLYISSUEDACCOUNTINGSTANDARDSAPPLICABLETOTHECOMPANY</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - ACQUISTIONS AND DIVESTITURES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/ACQUISTIONSANDDIVESTITURES</Role>
      <ShortName>ACQUISTIONS AND DIVESTITURES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - REVENUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/REVENUE</Role>
      <ShortName>REVENUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/PROPERTYPLANTANDEQUIPMENT</Role>
      <ShortName>PROPERTY, PLANT, AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INTANGIBLEASSETS</Role>
      <ShortName>INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - EQUITY METHOD INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYMETHODINVESTMENTS</Role>
      <ShortName>EQUITY METHOD INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - DEFERRED REVENUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEFERREDREVENUE</Role>
      <ShortName>DEFERRED REVENUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEBT</Role>
      <ShortName>DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/FINANCIALINSTRUMENTS</Role>
      <ShortName>FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - EQUITY AND MEZZANINE EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITY</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUPPLEMENTALCASHFLOWINFORMATION</Role>
      <ShortName>SUPPLEMENTAL CASH FLOW INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - EQUITY AND NONCASH COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDNONCASHCOMPENSATION</Role>
      <ShortName>EQUITY AND NONCASH COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - SEGMENT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATION</Role>
      <ShortName>SEGMENT INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUBSEQUENTEVENTS</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTLYISSUEDACCOUNTINGSTANDARDSAPPLICABLETOTHECOMPANYPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTLYISSUEDACCOUNTINGSTANDARDSAPPLICABLETOTHECOMPANYTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTLYISSUEDACCOUNTINGSTANDARDSAPPLICABLETOTHECOMPANY</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - ACQUISTIONS AND DIVESTITURES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/ACQUISTIONSANDDIVESTITURESTables</Role>
      <ShortName>ACQUISTIONS AND DIVESTITURES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/ACQUISTIONSANDDIVESTITURES</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - REVENUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/REVENUETables</Role>
      <ShortName>REVENUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/REVENUE</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/PROPERTYPLANTANDEQUIPMENTTables</Role>
      <ShortName>PROPERTY, PLANT, AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/PROPERTYPLANTANDEQUIPMENT</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INTANGIBLEASSETSTables</Role>
      <ShortName>INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/INTANGIBLEASSETS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - EQUITY METHOD INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYMETHODINVESTMENTSTables</Role>
      <ShortName>EQUITY METHOD INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/EQUITYMETHODINVESTMENTS</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - DEFERRED REVENUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEFERREDREVENUETables</Role>
      <ShortName>DEFERRED REVENUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/DEFERREDREVENUE</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEBTTables</Role>
      <ShortName>DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/DEBT</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/COMMITMENTSANDCONTINGENCIESTables</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/COMMITMENTSANDCONTINGENCIES</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/FINANCIALINSTRUMENTSTables</Role>
      <ShortName>FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/FINANCIALINSTRUMENTS</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - EQUITY AND MEZZANINE EQUITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITYTables</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITY</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/EARNINGSPERSHARE</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUPPLEMENTALCASHFLOWINFORMATIONTables</Role>
      <ShortName>SUPPLEMENTAL CASH FLOW INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/SUPPLEMENTALCASHFLOWINFORMATION</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - EQUITY AND NONCASH COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDNONCASHCOMPENSATIONTables</Role>
      <ShortName>EQUITY AND NONCASH COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/EQUITYANDNONCASHCOMPENSATION</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/INCOMETAXES</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/LEASES</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - SEGMENT INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATIONTables</Role>
      <ShortName>SEGMENT INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/SEGMENTINFORMATION</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - ORGANIZATION, CORPORATE REORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/ORGANIZATIONCORPORATEREORGANIZATIONBUSINESSOPERATIONSANDPRESENTATIONANDCONSOLIDATIONDetails</Role>
      <ShortName>ORGANIZATION, CORPORATE REORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/ORGANIZATIONCORPORATEREORGANIZATIONBUSINESSOPERATIONSANDPRESENTATIONANDCONSOLIDATION</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTLYISSUEDACCOUNTINGSTANDARDSAPPLICABLETOTHECOMPANYNarrativeDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTLYISSUEDACCOUNTINGSTANDARDSAPPLICABLETOTHECOMPANYTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY - Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESANDRECENTLYISSUEDACCOUNTINGSTANDARDSAPPLICABLETOTHECOMPANYPropertyPlantandEquipmentDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE COMPANY - Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - ACQUISTIONS AND DIVESTITURES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/ACQUISTIONSANDDIVESTITURESNarrativeDetails</Role>
      <ShortName>ACQUISTIONS AND DIVESTITURES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - ACQUISTIONS AND DIVESTITURES - Schedule of Fair Value of the Assets and Liabilities Acquired (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/ACQUISTIONSANDDIVESTITURESScheduleofFairValueoftheAssetsandLiabilitiesAcquiredDetails</Role>
      <ShortName>ACQUISTIONS AND DIVESTITURES - Schedule of Fair Value of the Assets and Liabilities Acquired (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - ACQUISTIONS AND DIVESTITURES - Schedule of Pro Forma Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/ACQUISTIONSANDDIVESTITURESScheduleofProFormaInformationDetails</Role>
      <ShortName>ACQUISTIONS AND DIVESTITURES - Schedule of Pro Forma Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - REVENUE - Schedule of Estimated Revenue Expected to be Recognized (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/REVENUEScheduleofEstimatedRevenueExpectedtobeRecognizedDetails</Role>
      <ShortName>REVENUE - Schedule of Estimated Revenue Expected to be Recognized (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - REVENUE - Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/REVENUEScheduleofDisaggregatedRevenuebyGeographicAreaandMajorProductsandServicesReportableSegmentsDetails</Role>
      <ShortName>REVENUE - Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Schedule of Property, Plant, and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/PROPERTYPLANTANDEQUIPMENTScheduleofPropertyPlantandEquipmentNetDetails</Role>
      <ShortName>PROPERTY, PLANT, AND EQUIPMENT - Schedule of Property, Plant, and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/PROPERTYPLANTANDEQUIPMENTNarrativeDetails</Role>
      <ShortName>PROPERTY, PLANT, AND EQUIPMENT - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - PROPERTY, PLANT, AND EQUIPMENT - Schedule of Depreciation Expense and Capitalized Interest (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/PROPERTYPLANTANDEQUIPMENTScheduleofDepreciationExpenseandCapitalizedInterestDetails</Role>
      <ShortName>PROPERTY, PLANT, AND EQUIPMENT - Schedule of Depreciation Expense and Capitalized Interest (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - INTANGIBLE ASSETS - Intangible Assets and Liabilities Subject to Amortization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INTANGIBLEASSETSIntangibleAssetsandLiabilitiesSubjecttoAmortizationDetails</Role>
      <ShortName>INTANGIBLE ASSETS - Intangible Assets and Liabilities Subject to Amortization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - INTANGIBLE ASSETS - Recognized Amortization Expense in Other Revenues and Cost and Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INTANGIBLEASSETSRecognizedAmortizationExpenseinOtherRevenuesandCostandExpensesDetails</Role>
      <ShortName>INTANGIBLE ASSETS - Recognized Amortization Expense in Other Revenues and Cost and Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - INTANGIBLE ASSETS - Estimated Aggregate Annual Amortization Expected to be Recognized (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INTANGIBLEASSETSEstimatedAggregateAnnualAmortizationExpectedtobeRecognizedDetails</Role>
      <ShortName>INTANGIBLE ASSETS - Estimated Aggregate Annual Amortization Expected to be Recognized (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - EQUITY METHOD INVESTMENTS - Schedule of Equity Method Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYMETHODINVESTMENTSScheduleofEquityMethodInvestmentsDetails</Role>
      <ShortName>EQUITY METHOD INVESTMENTS - Schedule of Equity Method Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - EQUITY METHOD INVESTMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYMETHODINVESTMENTSNarrativeDetails</Role>
      <ShortName>EQUITY METHOD INVESTMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - EQUITY METHOD INVESTMENTS - Balance Sheet Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYMETHODINVESTMENTSBalanceSheetInformationDetails</Role>
      <ShortName>EQUITY METHOD INVESTMENTS - Balance Sheet Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - EQUITY METHOD INVESTMENTS - Statements of Operations Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYMETHODINVESTMENTSStatementsofOperationsInformationDetails</Role>
      <ShortName>EQUITY METHOD INVESTMENTS - Statements of Operations Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - DEFERRED REVENUE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEFERREDREVENUEDetails</Role>
      <ShortName>DEFERRED REVENUE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/DEFERREDREVENUETables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - DEBT - Components of Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEBTComponentsofLongTermDebtDetails</Role>
      <ShortName>DEBT - Components of Long-Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - DEBT - Schedule of Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEBTScheduleofMaturitiesDetails</Role>
      <ShortName>DEBT - Schedule of Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - DEBT - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEBTNarrativeDetails</Role>
      <ShortName>DEBT - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - DEBT - Schedule of Maturities of Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEBTScheduleofMaturitiesofLongTermDebtDetails</Role>
      <ShortName>DEBT - Schedule of Maturities of Long-Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - DEBT - Schedule of Redemption Price (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/DEBTScheduleofRedemptionPriceDetails</Role>
      <ShortName>DEBT - Schedule of Redemption Price (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - COMMITMENTS AND CONTINGENCIES - Rollforward of Environmental Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/COMMITMENTSANDCONTINGENCIESRollforwardofEnvironmentalMattersDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Rollforward of Environmental Matters (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - FINANCIAL INSTRUMENTS - Fair value of Debt Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/FINANCIALINSTRUMENTSFairvalueofDebtInstrumentsDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS - Fair value of Debt Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - FINANCIAL INSTRUMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/FINANCIALINSTRUMENTSNarrativeDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - EQUITY AND MEZZANINE EQUITY - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITYNarrativeDetails</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - EQUITY AND MEZZANINE EQUITY - Partners' Capital and Schedule of Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITYPartnersCapitalandScheduleofUnitsDetails</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY - Partners' Capital and Schedule of Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - EQUITY AND MEZZANINE EQUITY - Common Stock Issued (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITYCommonStockIssuedDetails</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY - Common Stock Issued (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - EQUITY AND MEZZANINE EQUITY - Schedule Of Series A Preferred Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITYScheduleOfSeriesAPreferredStockDetails</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY - Schedule Of Series A Preferred Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - EQUITY AND MEZZANINE EQUITY - Partners' Capital Account, Common Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITYPartnersCapitalAccountCommonUnitsDetails</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY - Partners' Capital Account, Common Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - EQUITY AND MEZZANINE EQUITY - Change in Subsidiary Series A Preferred Unit Balance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITYChangeinSubsidiarySeriesAPreferredUnitBalanceDetails</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY - Change in Subsidiary Series A Preferred Unit Balance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - EQUITY AND MEZZANINE EQUITY - Changes in Noncontrolling Interest (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDMEZZANINEEQUITYChangesinNoncontrollingInterestDetails</Role>
      <ShortName>EQUITY AND MEZZANINE EQUITY - Changes in Noncontrolling Interest (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - EARNINGS PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EARNINGSPERSHAREDetails</Role>
      <ShortName>EARNINGS PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/EARNINGSPERSHARETables</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUPPLEMENTALCASHFLOWINFORMATIONDetails</Role>
      <ShortName>SUPPLEMENTAL CASH FLOW INFORMATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/SUPPLEMENTALCASHFLOWINFORMATIONTables</ParentRole>
      <Position>84</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - EQUITY AND NONCASH COMPENSATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDNONCASHCOMPENSATIONNarrativeDetails</Role>
      <ShortName>EQUITY AND NONCASH COMPENSATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - EQUITY AND NONCASH COMPENSATION - SMLP Long-Term Incentive Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDNONCASHCOMPENSATIONSMLPLongTermIncentivePlanDetails</Role>
      <ShortName>EQUITY AND NONCASH COMPENSATION - SMLP Long-Term Incentive Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - EQUITY AND NONCASH COMPENSATION - Schedule of Intrinsic Values (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDNONCASHCOMPENSATIONScheduleofIntrinsicValuesDetails</Role>
      <ShortName>EQUITY AND NONCASH COMPENSATION - Schedule of Intrinsic Values (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - EQUITY AND NONCASH COMPENSATION - SMP Net Profits Interests (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/EQUITYANDNONCASHCOMPENSATIONSMPNetProfitsInterestsDetails</Role>
      <ShortName>EQUITY AND NONCASH COMPENSATION - SMP Net Profits Interests (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - INCOME TAXES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INCOMETAXESNarrativeDetails</Role>
      <ShortName>INCOME TAXES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - INCOME TAXES - Summary of Provision for (Benefit from) Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INCOMETAXESSummaryofProvisionforBenefitfromIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES - Summary of Provision for (Benefit from) Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - INCOME TAXES - Reconciliation of Income Tax Provision (Benefit) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INCOMETAXESReconciliationofIncomeTaxProvisionBenefitDetails</Role>
      <ShortName>INCOME TAXES - Reconciliation of Income Tax Provision (Benefit) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - INCOME TAXES - Reconciliation of Income Tax Provision (Benefit) Prior to the Adoption of ASU 2023-09 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INCOMETAXESReconciliationofIncomeTaxProvisionBenefitPriortotheAdoptionofASU202309Details</Role>
      <ShortName>INCOME TAXES - Reconciliation of Income Tax Provision (Benefit) Prior to the Adoption of ASU 2023-09 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/INCOMETAXESComponentsofDeferredTaxAssetsandLiabilitiesDetails</Role>
      <ShortName>INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - LEASES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/LEASESNarrativeDetails</Role>
      <ShortName>LEASES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - LEASES - Schedule of Right of Use Assets and Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/LEASESScheduleofRightofUseAssetsandLeaseLiabilitiesDetails</Role>
      <ShortName>LEASES - Schedule of Right of Use Assets and Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - LEASES - Schedule of Lease Cost and Other Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/LEASESScheduleofLeaseCostandOtherInformationDetails</Role>
      <ShortName>LEASES - Schedule of Lease Cost and Other Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - LEASES - Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/LEASESLeaseExpenseDetails</Role>
      <ShortName>LEASES - Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - LEASES - Future Minimum Lease Payments Due and Future Minimum Rentals to be Received under Noncancelable Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/LEASESFutureMinimumLeasePaymentsDueandFutureMinimumRentalstobeReceivedunderNoncancelableLeasesDetails</Role>
      <ShortName>LEASES - Future Minimum Lease Payments Due and Future Minimum Rentals to be Received under Noncancelable Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - SEGMENT INFORMATION - Reconciliation of Segment Adjusted EBITDA (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATIONReconciliationofSegmentAdjustedEBITDADetails</Role>
      <ShortName>SEGMENT INFORMATION - Reconciliation of Segment Adjusted EBITDA (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - SEGMENT INFORMATION - Total Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATIONTotalAssetsDetails</Role>
      <ShortName>SEGMENT INFORMATION - Total Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>9955582 - Disclosure - SEGMENT INFORMATION - Concentration Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATIONConcentrationRiskDetails</Role>
      <ShortName>SEGMENT INFORMATION - Concentration Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>9955583 - Disclosure - SEGMENT INFORMATION - Depreciation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATIONDepreciationDetails</Role>
      <ShortName>SEGMENT INFORMATION - Depreciation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>9955584 - Disclosure - SEGMENT INFORMATION - Cash Paid for Capital Expenditures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATIONCashPaidforCapitalExpendituresDetails</Role>
      <ShortName>SEGMENT INFORMATION - Cash Paid for Capital Expenditures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>9955585 - Disclosure - SEGMENT INFORMATION - Reconciliation of Net Loss to Adjusted EBITDA (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATIONReconciliationofNetLosstoAdjustedEBITDADetails</Role>
      <ShortName>SEGMENT INFORMATION - Reconciliation of Net Loss to Adjusted EBITDA (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>9955586 - Disclosure - SEGMENT INFORMATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SEGMENTINFORMATIONNarrativeDetails</Role>
      <ShortName>SEGMENT INFORMATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="smlp-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>9955587 - Disclosure - SUBSEQUENT EVENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.summitmidstream.com/role/SUBSEQUENTEVENTSDetails</Role>
      <ShortName>SUBSEQUENT EVENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.summitmidstream.com/role/SUBSEQUENTEVENTS</ParentRole>
      <Position>106</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="smlp-20251231.htm">smlp-20251231.htm</File>
    <File>smlp-20251231.xsd</File>
    <File>smlp-20251231_cal.xml</File>
    <File>smlp-20251231_def.xml</File>
    <File>smlp-20251231_lab.xml</File>
    <File>smlp-20251231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>smlp-20251231_g1.jpg</File>
    <File>smlp-20251231_g2.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1414">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="41">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
