Entity Central Index Key Corporate and other expenses. Depreciation depletion and amortization including amortization of above and below market leases. Adjusted earnings before interest, taxes, depreciation, and amortization, proportional equity method investment adjustment. Adjustments related to minimum volume commitments shortfall payments. Adjustments related to capital reimbursement activity. Adjusted earnings before interest, taxes, depreciation, and amortization. Cover [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Title of 12(b) Security Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Shell Company Entity Shell Company Entity File Number Entity File Number Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, Address Line Two Entity Address Address Line2 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Document Quarterly Report Document Quarterly Report Entity Interactive Data Current Entity Interactive Data Current Document Transition Report Document Transition Report Entity Incorporation, State or Country Code Entity Incorporation State Country Code Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Mezzanine Capital [Member] Mezzanine Capital Mezzanine Capital [Member] Statement [Line Items] Statement [Line Items] Subsidiary Series A preferred unitholders, issued Preferred Units Issued Subsidiary Series A preferred unitholders, outstanding Preferred Units Outstanding Common limited partner capital (in shares), issued Limited Partners Capital Account Units Issued Common limited partner capital (in shares), outstanding Limited Partners Capital Account Units Outstanding ASSETS Assets [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Restricted cash Restricted Cash Accounts receivable, net Accounts Receivable Net Current Other current assets Other Assets Current Total current assets Assets Current Property, plant and equipment, net Property Plant And Equipment Net Intangible assets, net Finite Lived Intangible Assets Net Investment in equity method investees Equity Method Investments Other noncurrent assets Other Assets Noncurrent TOTAL ASSETS Assets LIABILITIES AND CAPITAL Liabilities And Stockholders Equity [Abstract] Trade accounts payable Accounts Payable Current Accrued expenses Accrued Liabilities Current Deferred revenue Contract With Customer Liability Current Ad valorem taxes payable Accrual For Taxes Other Than Income Taxes Current Accrued compensation and employee benefits Accrued Employee Benefits Current Accrued interest Interest Payable Current Accrued environmental remediation Accrued Environmental Loss Contingencies Current Other current liabilities Other Liabilities Current Total current liabilities Liabilities Current Long-term debt Long Term Debt Noncurrent Noncurrent deferred revenue Contract With Customer Liability Noncurrent Noncurrent accrued environmental remediation Accrued Environmental Loss Contingencies Noncurrent Other noncurrent liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 13) Commitments And Contingencies Mezzanine Capital Temporary Equity [Abstract] Subsidiary Series A Preferred Units (86,802 and 85,308 units issued and outstanding at March 31, 2021 and December 31, 2020, respectively) Temporary Equity Carrying Amount Attributable To Parent Partners' Capital Partners Capital [Abstract] Series A Preferred Units (162,109 units issued and outstanding at March 31, 2021 and December 31, 2020) Preferred Units Preferred Partners Capital Accounts Common limited partner capital (6,206,021 and 6,110,092 units issued and outstanding at March 31, 2021 and December 31, 2020, respectively) Limited Partners Capital Account Total partners' capital Partners Capital Including Portion Attributable To Noncontrolling Interest TOTAL LIABILITIES AND CAPITAL Liabilities And Stockholders Equity Income Statement [Abstract] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Gathering Services and Related Fees Natural Gas Gathering Transportation Marketing And Processing [Member] Natural Gas, NGLs and Condensate Sales Oil And Condensate [Member] Other Revenues Product And Service Other [Member] Limited Partners' Capital Account by Class Limited Partners Capital Account By Class [Axis] Limited Partners' Capital Account, Class Limited Partners Capital Account Class [Domain] Series A preferred units. Series A Preferred Units Series A Preferred Units [Member] Common unit. Common Units Common Units [Member] Consolidated Entities Consolidated Entities [Axis] Consolidated Entities Consolidated Entities [Domain] Subsidiary Subsidiaries [Member] Revenues: Revenues [Abstract] Total revenues Revenue From Contract With Customer Excluding Assessed Tax Costs and expenses: Costs And Expenses [Abstract] Cost of natural gas and NGLs Cost Of Goods And Services Sold Type of Cost, Good or Service [Extensible List] Type Of Cost Good Or Service Extensible List Operation and maintenance Utilities Operating Expense Maintenance And Operations General and administrative General And Administrative Expense Depreciation and amortization Depreciation Depletion And Amortization Transaction costs Business Combination Acquisition Related Costs (Gain) loss on asset sales, net Gain Loss On Disposition Of Assets1 Long-lived asset impairments Impairment Of Long Lived Assets To Be Disposed Of Total costs and expenses Costs And Expenses Other income (expense), net Other Operating Income Expense Net Interest expense Interest Expense Loss on ECP Warrants and other Gain Loss On Sale Of Derivatives Income before income taxes and equity method investment income Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income tax benefit Income Tax Expense Benefit Income from equity method investees Income Loss From Equity Method Investments Net income Profit Loss Net income (loss) attributable to limited partners Net Income Loss Allocated To Limited Partners Net loss attributable to noncontrolling interest Net Income Loss Attributable To Noncontrolling Interest Net income attributable to Summit Midstream Partners, LP Net Income Loss Net income (loss) per limited partner unit: Earnings Per Limited Partnership Unit [Abstract] Basic (in dollars per share) Net Income Loss Per Outstanding Limited Partnership Unit Basic Net Of Tax Diluted (in dollars per share) Net Income Loss Net Of Tax Per Outstanding Limited Partnership Unit Diluted Weighted-average limited partner units outstanding: Weighted Average Number Of Shares Outstanding [Abstract] Basic (shares) Weighted Average Limited Partnership Units Outstanding Diluted (shares) Weighted Average Limited Partnership Units Outstanding Diluted Profit loss excluding subsidiary income. Partners' capital account tax withholding for unit-based compensation. Statement Of Partners Capital [Abstract] Partner Type Partner Type Of Partners Capital Account [Axis] Partner Type of Partners' Capital Account, Name Partner Type Of Partners Capital Account Name [Domain] Common noncontrolling interests. Common Noncontrolling Interest Common Noncontrolling Interests [Member] Partners capital. Partners' Capital Partners Capital [Member] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Series A Preferred Units Series A Preferred Stock [Member] Partner Capital Components Partner Capital Components [Axis] Partner Capital Components Partner Capital Components [Domain] Noncontrolling Interest Noncontrolling Interest [Member] Beginning balance Net income (loss) Profit Loss Excluding Subsidiary Income Net cash distributions to SMLP unitholders Partners Capital Account Distributions Unit-based compensation Partners Capital Account Unit Based Compensation Effect of common unit issuances under SMLP LTIP Partners Capital Account Sale Of Units Tax withholdings and associated payments on vested SMLP LTIP awards Partners Capital Account Tax Withholding For Unit Based Compensation Ending balance Non cash lease expense. Proceeds from sale of assets. Statement Of Cash Flows [Abstract] Investment, Name Schedule Of Equity Method Investment Equity Method Investee Name [Axis] Investment, Name Equity Method Investee Name [Domain] Double E company. Double E Double E Company L L C [Member] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Permian transmission credit facility. Permian Transmission Credit Facility [Member] Permian Transmission Credit Facility [Member] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net income Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Including Amortization Of Above And Below Market Leases Noncash lease expense Non Cash Lease Expense Amortization of debt issuance costs Amortization Of Financing Costs Unit-based and noncash compensation Share Based Compensation Income from equity method investees Distributions from equity method investees Equity Method Investment Dividends Or Distributions Loss on ECP Warrants and other Long-lived asset impairment Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Trade accounts payable Increase Decrease In Accounts Payable Trade Accrued expenses Increase Decrease In Accrued Liabilities Deferred revenue, net Increase Decrease In Contract With Customer Liability Ad valorem taxes payable Increase Decrease In Property And Other Taxes Payable Accrued interest Increase Decrease In Interest Payable Net Accrued environmental remediation, net Increase Decrease In Regulatory Liabilities Other, net Increase Decrease In Other Operating Capital Net Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Capital expenditures Payments To Acquire Property Plant And Equipment Proceeds from asset sale Proceeds From Sale Of Productive Assets Investment in Double E equity method investee Payments To Acquire Equity Method Investments Other, net Payments For Proceeds From Other Investing Activities Net cash used in investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Net cash distributions to noncontrolling interest SMLP unitholders Payments To Minority Shareholders Borrowings under Revolving Credit Facility Proceeds From Long Term Lines Of Credit Repayments on Revolving Credit Facility Repayments Of Lines Of Credit Repayments on SMPH Term Loan before TL Restructuring Repayments Of Related Party Debt Proceeds from issuance of Subsidiary Series A preferred units, net of issuance costs Proceeds From Issuance Of Preferred Limited Partners Units Debt issuance costs Payments Of Financing Costs Proceeds from asset sale Proceeds From Sale Of Assets Other, net Proceeds From Payments For Other Financing Activities Net cash provided by (used in) financing activities Net Cash Provided By Used In Financing Activities Net change in cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash, cash equivalents and restricted cash, beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash, cash equivalents and restricted cash, end of period Organization Consolidation And Presentation Of Financial Statements [Abstract] ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING STANDARDS APPLICABLE TO THE PARTNERSHIP Significant Accounting Policies [Text Block] Revenue From Contract With Customer [Abstract] REVENUE Revenue From Contract With Customer [Text Block] Property Plant And Equipment [Abstract] PROPERTY, PLANT, AND EQUIPMENT, NET Property Plant And Equipment Disclosure [Text Block] Equity Method Investments And Joint Ventures [Abstract] EQUITY METHOD INVESTMENTS Equity Method Investments Disclosure [Text Block] Contract with customer liability disclosure. Contract With Customer Liability Disclosure [Text Block] Contract With Customer Liability Disclosure [Text Block] Debt Disclosure [Abstract] DEBT Debt Disclosure [Text Block] Fair Value Disclosures [Abstract] FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Equity [Abstract] PARTNERS' CAPITAL AND MEZZANINE CAPITAL Partners Capital Notes Disclosure [Text Block] Earnings Per Share [Abstract] EARNINGS PER UNIT Earnings Per Share [Text Block] Supplemental Cash Flow Elements [Abstract] SUPPLEMENTAL CASH FLOW INFORMATION Cash Flow Supplemental Disclosures [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] UNIT-BASED AND NONCASH COMPENSATION Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Leases, commitments and contingencies. Commitments And Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Leases Commitments And Contingencies Disclosure [Text Block] Restructuring And Related Activities [Abstract] RESTRUCTURING Restructuring And Related Activities Disclosure [Text Block] Segment Reporting [Abstract] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Subsequent Events [Abstract] SUBSEQUENT EVENTS Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Cash, Cash Equivalents and Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Interest Rate Swaps Derivatives Policy [Text Block] New Accounting Standards Recently Implemented New Accounting Pronouncements Policy Policy [Text Block] Schedule of Estimated Revenue Expected to be Recognized and MVC Shortfall Payments Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Table [Text Block] Schedule of Disaggregated Revenue by Geographic Area and Major Products and Services Reportable Segments Disaggregation Of Revenue Table [Text Block] Schedule of contract with customer, asset. Schedule of Information about Contract Assets from Contracts with Customers Schedule Of Contract With Customer Asset Table [Text Block] Schedule of property, plant, and equipment, net Property Plant And Equipment [Text Block] Tabular disclosure of depreciation expense related to the property, plant and equipment and capitalized interest costs. Schedule Of Depreciation Expense And Capitalized Interest Costs Table Text Block Schedule Of Depreciation Expense And Capitalized Interest Costs Table [Text Block] Equity Method Investments Equity Method Investments [Text Block] Rollforward of deferred revenue Contract With Customer Asset And Liability Table [Text Block] Schedule of debt and capital leases Schedule Of Debt Instruments [Text Block] Summary of the estimated fair value of debt instruments Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments Table [Text Block] Schedule of partner units activity. Schedule of partner units activity Schedule Of Partner Units Activity Table [Text Block] Change in subsidiary Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Text Block] Schedule of earnings per limited partner unit Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of supplemental cash flow information Schedule Of Cash Flow Supplemental Disclosures Table [Text Block] Schedule of Accrued Environmental Remediation Schedule Of Environmental Loss Contingencies By Site [Text Block] Schedule of assets by reportable segment Reconciliation Of Assets From Segment To Consolidated [Text Block] Schedule of segment reporting information Reconciliation Of Revenue From Segments To Consolidated [Text Block] Reconciliation of net income to adjusted EBITDA. Reconciliation of net income to adjusted EBITDA Reconciliation Of Net Income To Adjusted E B I T D A Table [Text Block] Purchase agreement date Common units pledged as collateral. Common units not pledged as collateral. Consideration for a consensual debt discharge and restructuring. Organization and business operations. Disclosure pertaining to organization and business operations. Organization And Business Operations [Table] Organization And Business Operations [Table] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Summit Midstream Partners Holdings, LLC. Summit Midstream Partners Holdings L L C Summit Midstream Partners Holdings L L C [Member] Summit investments. Summit Investments Summit Investments [Member] SMP Holdings. SMP Holdings S M P Holdings [Member] Legal Entity Legal Entity [Axis] Entity Entity [Domain] Energy Capital Partners. Energy Capital Partners Energy Capital Partners [Member] Organization And Business Operations [Line Items] Organization And Business Operations [Line Items] Purchase agreement date Purchase Agreement Date SMLP common units pledged as collateral under the SMPH Term Loan Common Units Pledged As Collateral Common Units Not Pledged As Collateral Common Units Not Pledged As Collateral Common units issued prior to reverse unit split Stock Issued During Period Shares Reverse Stock Splits Common limited partner capital (shares) Cash paid to Acquire investment Payments To Acquire Businesses Gross Number of common units purchased. Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued Common units retire Treasury Stock Shares Debt discharge and restructuring Consideration For Consensual Debt Discharge And Restructuring Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Table] Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Table] Gathering services and related fees. Gathering Services and Related Fees Gathering Servicesand Related Fees [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date [Axis] Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] Revenue, remaining performance obligation, expected timing of satisfaction, Period Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 Revenue, remaining performance obligation Revenue Remaining Performance Obligation Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] Natural gas, NGLs and condensate sales. Natural Gas, NGLs and Condensate Sales Natural Gas N G L And Condensate Sales [Member] Other products and services. Other Revenues Other Products And Services [Member] Consolidation Items Consolidation Items [Axis] Consolidation Items Consolidation Items [Domain] Reportable Segments Operating Segments [Member] Segments Statement Business Segments [Axis] Segments Segment [Domain] Utica Shale segment. Utica Shale Utica Shale Segment [Member] Williston Basin segment. Williston Basin Williston Basin Segment [Member] DJ Basin. DJ Basin D J Basin Segment [Member] Permian Basin segment member. Permian Basin Permian Basin Segment [Member] Piceance Basin segment. Piceance Basin Piceance Basin Segment [Member] Barnett Shale segment. Barnett Shale Barnett Shale Segment [Member] Marcellus Shale segment. Marcellus Shale Marcellus Shale Segment [Member] All Other Segments All Other Segments [Member] Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Contract with customer asset, additions. Contract With Customer Asset And Liability [Abstract] Contract assets, beginning of period Contract With Customer Asset Net Additions Contract With Customer Asset Additions Transfers out Contract With Customer Asset Reclassified To Receivable Contract assets, end of period Revenue from contract with customer. Revenue from contract with customer. Revenue From Contract With Customer [Table] Revenue From Contract With Customer [Table] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Other Noncurrent Assets Other Noncurrent Assets [Member] Revenue From Contract With Customer [Line Items] Revenue From Contract With Customer [Line Items] Receivables with customers Unbilled Contracts Receivable Contract assets included in accounts receivable Long-term contract assets included in other noncurrent assets Contract With Customer Asset Net Noncurrent Contract liabilities, revenue Contract With Customer Liability Revenue Recognized Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Gathering and processing systems and related equipment Gas Gathering And Processing Equipment [Member] Construction in progress Construction In Progress [Member] Land and line fill. Land and line fill Landand Line Fill [Member] Other Other Capitalized Property Plant And Equipment [Member] Property, Plant and Equipment [Line Items] Property Plant And Equipment [Line Items] Property, plant and equipment, gross Property Plant And Equipment Gross Less: accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Property, plant and equipment, net Depreciation expense Depreciation Capitalized interest Interest Costs Incurred Capitalized Schedule Of Equity Method Investments [Table] Schedule Of Equity Method Investments [Table] Ohio Gathering Company, L.L.C. OGC Ohio Gathering Company L L C [Member] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Principal Owner Principal Owner [Member] Schedule Of Equity Method Investments [Line Items] Schedule Of Equity Method Investments [Line Items] Additional cash investments Payments To Acquire Other Investments Percentage of ownership interest Equity Method Investment Ownership Percentage Equity method investment, amortization of difference between carrying amount and underlying equity. Summit Midstream Partners, LLC. Summit Midstream Partners, LLC Summit Midstream Partners L L C [Member] Investment in Ohio Gathering, March 31, March cash distributions Basis difference Equity Method Investment Amortizationof Difference Between Carrying Amountand Underlying Equity Investment in Ohio Gathering (Books and records), February 28, Contract with customer liability current additions. Contract with customer liability current revenue recognized. Deferred Revenue Disclosure [Abstract] Movement in Deferred Revenue [Roll Forward] Change In Contract With Customer Liability [Abstract] Current deferred revenue, beginning balance Current deferred revenue, Add: Additions Contract With Customer Liability Current Additions Current deferred revenue, Less revenue recognized Contract With Customer Liability Current Revenue Recognized Current deferred revenue, ending balance Contract with customer liability noncurrent additions. Contract with customer liability noncurrent reclassification to current. Noncurrent deferred revenue, beginning balance Noncurrent deferred revenue, Additions Contract With Customer Liability Noncurrent Additions Noncurrent deferred revenue, Less reclassification to current deferred revenue Contract With Customer Liability Noncurrent Reclassification To Current Noncurrent deferred revenue, ending balance Line Of Credit Facility [Table] Line Of Credit Facility [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Senior notes due may twenty twenty two. Senior Secured Revolving Credit Facility Due May 2022 Senior Notes Due May Twenty Twenty Two [Member] 5.5% 2022 Senior Notes Senior Notes Due August 2022 Five Point Five Percent Two Thousand Twenty Two Senior Notes [Member] 5.75% 2022 Senior Notes. Senior Notes Due April 2025 Five Point Seven Five Percent Two Thousand Twenty Five Senior Notes [Member] Line of Credit Facility [Line Items] Line Of Credit Facility [Line Items] Revolving credit facility Secured Long Term Debt Secured notes Line Of Credit Less unamortized debt issuance costs Deferred Finance Costs Net Unsecured notes Unsecured Long Term Debt Total debt Long Term Debt Less: current portion Long Term Debt Current Stated interest rate Debt Instrument Interest Rate Stated Percentage Line of credit facility maturity date month and year. Revolving credit facility Revolving Credit Facility [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] LIBOR London Interbank Offered Rate L I B O R [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Maximum Maximum [Member] Minimum [Member] Minimum [Member] Borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Revolving credit facility maturity date Line Of Credit Facility Maturity Date Month And Year Applicable margin Debt Instrument Basis Spread On Variable Rate1 Commitment fee on unused portion of the facility Line Of Credit Facility Unused Capacity Commitment Fee Percentage Interest rate at period end Line Of Credit Facility Interest Rate At Period End Unused portion under the facility Line Of Credit Facility Remaining Borrowing Capacity Borrowing capacity Line Of Credit Facility Current Borrowing Capacity Ratio of consolidated trailing 12month EBITDA to net interest expense. Ratio of net indebtedness to consolidated trailing 12 month EBITDA. Ratio of first lien net indebtedness to consolidated trailing 12 month EBITDA. Ratio of consolidated trailing 12-month EBITDA to net interest expense Ratio Of Consolidated Trailing12month E B I T D A To Net Interest Expense Ratio of total net indebtedness to consolidated trailing 12-month EBITDA Ratio Of Net Indebtedness To Consolidated Trailing12 Month E B I T D A Ratio of first lien net indebtedness to consolidated trailing 12-month EBITDA Ratio Of First Lien Net Indebtedness To Consolidated Trailing12 Month E B I T D A Term loan credit facility. Term Loan Credit Facility Term Loan Credit Facility [Member] Working Capital Credit Facility. Working Capital Credit Facility Working Capital Credit Facility [Member] Alternate base rate Base Rate [Member] Credit agreement. From and Including the Closing Date to and Excluding the Fifth Anniversary of the Closing Date Credit Agreement [Member] Proceeds from secured lines of credit Proceeds From Secured Lines Of Credit Unused portion of the Permian Transmission Credit facility Debt Instrument Unused Borrowing Capacity Amount Debt instrument interest rate Debt Instrument Fee Debt Default Long term Debt Amount Debt Default Longterm Debt Amount Debt Instrument [Table] Debt Instrument [Table] Summit Holdings and Finance Corporation. Summit Holdings And Finance Corporation Summit Holdings And Finance Corporation [Member] Two thousand twenty two senior notes member. 2022 Senior Note Two Thousand Twenty Two Senior Notes [Member] Debt Instrument, Redemption, Period Debt Instrument Redemption Period [Axis] Debt Instrument, Redemption, Period Debt Instrument Redemption Period [Domain] Redemption period one Debt Instrument Redemption Period One [Member] Redemption period two Debt Instrument Redemption Period Two [Member] Redemption period three Debt Instrument Redemption Period Three [Member] Two thousand twenty five senior notes. 2025 Senior Notes Two Thousand Twenty Five Senior Notes [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Redemption price, expressed as percentage of principal amount Debt Instrument Redemption Price Percentage Debt issuance costs Deferred Finance Costs Noncurrent Gross Deferred issuance costs Fair Value By Balance Sheet Grouping [Table] Fair Value By Balance Sheet Grouping [Table] Represents information pertaining to Summit Midstream Holdings, LLC, a wholly-owned subsidiary of the reporting entity. Summit Holdings Summit Midstream Holdings L L C [Member] Senior Notes due 2022. 2022 Senior Notes Senior Notes Due2022 [Member] Senior Notes due 2025 2025 Senior Notes Senior Notes Due2025 [Member] Measurement Basis Fair Value By Measurement Basis [Axis] Fair Value Disclosure Item Amounts [Default] Portion At Fair Value Fair Value Disclosure [Member] Fair Value Measurement Fair Value Disclosure Item Amounts [Domain] Carrying Value Carrying Reported Amount Fair Value Disclosure [Member] Fair Value Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Estimated fair value (Level 2) Fair Value Inputs Level2 [Member] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Senior notes Notes Payable Fair Value Disclosure Concentration Risk [Table] Concentration Risk [Table] Derivative Instrument Derivative Instrument Risk [Axis] Derivative Contract Derivative Contract Type [Domain] Interest Rate Swap Interest Rate Swap [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Derivative liability, notional amount Derivative Liability Notional Amount Fair value, other assets Other Assets Fair Value Disclosure Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Limited partner common units. Common Units Limited Partner Common Units [Member] Class Of Stock [Line Items] Class Of Stock [Line Items] Rollforwards of the number of partner units Increase Decrease In Partners Capital Roll Forward Units, beginning balance (in shares) Partners Capital Account Units Common units issued for SMLP LTIP, net Partners Capital Account Units Unitbased Compensation Units, ending balance (in shares) Partners' capital. Partners' capital. Partners Capital [Table] Partners Capital [Table] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] PIK [Member] Payment In Kind P I K Note [Member] Class of Warrant or Right Class Of Warrant Or Right [Axis] Class of Warrant or Right Class Of Warrant Or Right [Domain] Revision of Prior Period Restatement [Axis] Revision of Prior Period Restatement [Domain] ECP holdings warrant. ECP Holdings Warrant E C P Holdings Warrant [Member] Partners Capital [Line Items] Partners Capital [Line Items] Preferred units issued Interest in partnership per unit Shares Issued Price Per Share Number of common units. Exchange offer expired date. Number of common units exchanged. Common units net of units withheld for withholding taxes. Common Units Issued Common Unit Issued Number of Common Units Number Of Common Units Exchange Offer Expired Date Exchange Offer Expired Date Number of Common Units Exchanged Number Of Common Units Exchanged Common Units Net of Units Withheld for Withholding Taxes Common Units Net Of Units Withheld For Withholding Taxes Redemption amount Preferred Stock Redemption Amount Balance Partners Capital PIK distributions Distribution Made To Limited Partner Unit Distribution Redemption accretion Preferred Stock Accretion Of Redemption Discount Balance Date upto which warrants are exercisable. Exercise price of Warrants Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 Valuation of warrants Warrants And Rights Outstanding Warrant or right, reason for issuance, description Class Of Warrant Or Right Reason For Issuing To Nonemployees Warrants exercisable date Date Upto Which Warrants Are Exercisable Distribution of all available cash, maximum period following end of quarter. Maximum period following end of quarter to distribute all available cash Distribution Of All Available Cash Maximum Period Following End Of Quarter Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Common units Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Phantom Units Phantom Share Units P S Us [Member] Subsidiaries Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Net income (loss) Weighted-average common units outstanding – basic Effect of nonvested phantom units Incremental Common Shares Attributable To Share Based Payment Arrangements Weighted-average common units outstanding – diluted Common unit – basic Common unit – diluted Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Cash interest paid Interest Paid Less: capitalized interest Interest Paid Capitalized Interest paid (net of capitalized interest) Interest Paid Net Cash paid for taxes Income Taxes Paid Noncash investing and financing activities: Noncash Investing And Financing Items [Abstract] Capital expenditures in trade accounts payable (period-end accruals) Capital Expenditures Incurred But Not Yet Paid Accretion of Subsidiary Series A Preferred Units Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Long-term incentive plan. SMLP LTIP Long Term Incentive Plan [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Granted units (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Grant date fair value (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Number of directors. Issued units (in shares) Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period Number of Directors Number Of Directors Grant date fair value (in dollars per share) Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value Units remaining available Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Loss contingency, pollution liability insurance policy, coverage. Loss contingency, property and business interruption insurance policy, coverage. Loss Contingencies [Table] Loss Contingencies [Table] Environmental Remediation Site Environmental Remediation Site [Axis] Environmental Remediation Site Environmental Remediation Site [Domain] Meadowlark Midstream gathering system. Meadowlark Midstream Gathering System Meadowlark Midstream Gathering System [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Coverage from pollution liability insurance policy Loss Contingency Pollution Liability Insurance Policy Coverage Coverage from property and business interruption insurance policy Loss Contingency Property And Business Interruption Insurance Policy Coverage Accrual for Environmental Loss Contingencies [Roll Forward] Accrual For Environmental Loss Contingencies Roll Forward Accrued environmental remediation, beginning balance Accrual For Environmental Loss Contingencies Payments made Accrual For Environmental Loss Contingencies Payments1 Additional accruals Accrual For Environmental Loss Contingencies Period Increase Decrease Accrued environmental remediation, ending balance Legal fines and other fees Accrual For Environmental Loss Contingencies Charges To Expense For New Losses Accrued loss contingency Accrual For Environmental Loss Contingencies Gross Schedule Of Restructuring And Related Costs [Table] Schedule Of Restructuring And Related Costs [Table] Restructuring Type Restructuring Cost And Reserve [Axis] Type of Restructuring Type Of Restructuring [Domain] 2020 restructuring activities member 2020 Restructuring Activities Two Thousand Twenty Restructuring Activities [Member] 2019 restructuring activities member 2019 Restructuring Activities Two Thousand Nineteen Restructuring Activities [Member] Restructuring Cost And Reserve [Line Items] Restructuring Cost And Reserve [Line Items] Restructuring costs Restructuring Costs Cash payment Payments For Restructuring Accrued and unpaid liabilities Schedule Of Segment Reporting Information By Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Corporate and Other Corporate Non Segment [Member] Ohio Gathering segment. Ohio Gathering Ohio Gathering Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Assets Capital expenditures. Double E Pipeline, LLC. Double E Double E Pipeline L L C [Member] Capital expenditures Capital Expenditures Equity method investment Adjusted EBITDA Adjusted Earnings Before Interest Taxes Depreciation And Amortization Reconciliation of net Income to EBITDA, additions. Add: Reconciliation Of Net Income To E B I T D A Additions [Abstract] Corporate and Other expense Corporate And Other Expenses Interest expense Proportional adjusted EBITDA for equity method investees Adjusted Earnings Before Interest Taxes Depreciation And Amortization Proportional Equity Method Investment Adjustment Adjustments related to MVC shortfall payments Adjustments Related To Minimum Volume Commitments Shortfall Payments Adjustments related to capital reimbursement activity Adjustments Related To Capital Reimbursement Activity (Gain) loss on asset sales, net Total of reportable segments' measures of profit Subsequent Event [Table] Subsequent Event [Table] Fresh-Start Adjustments Fresh Start Adjustments Type Of Fresh Start Adjustment [Axis] Type of Fresh-Start Adjustment Type Of Fresh Start Adjustment [Domain] Conversion of preferred stock to common stock [Member] Exchange Of Stock For Stock [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Series A Preferred Units accepted for exchange Partners Capital Account Units Converted Common units issued in exchange