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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income (loss) $ 5,000 $ (197,541) $ 5,406 $ (88,392)
Less: Net income attributable to Subsidiary Series A Preferred Units (3,769) (4,007) (11,040) (11,643)
Less: Net income attributable to Series A Preferred Stock (3,365) (3,393) (10,384) (9,926)
Add: Net loss attributable to noncontrolling interest 556 0 4,525 0
Net loss attributable to Summit Midstream Corporation $ (1,578) $ (204,941) $ (11,493) $ (109,961)
Weighted-average number of shares outstanding – basic (in shares) 12,255 10,649 12,090 10,583
Effect of assumed conversion and elimination of noncontrolling interest net income (in shares) 0 0 0 0
Weighted-average number of shares outstanding – diluted (in shares) 12,255 10,649 12,090 10,583
Common stock – basic (in dollars per share) $ (0.13) $ (19.25) $ (0.95) $ (10.39)
Common stock – diluted (in dollars per share) (0.13) (19.25) (0.95) (10.39)
Common Class B        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock – basic (in dollars per share) 0 0 0 0
Common stock – diluted (in dollars per share) $ 0 $ 0 $ 0 $ 0
Nonvested anti-dilutive restricted shares excluded from the calculation of diluted EPS and Class B Common Stock (in shares) 6,524 0 6,528 0
Restricted Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Nonvested anti-dilutive restricted shares excluded from the calculation of diluted EPS and Class B Common Stock (in shares) 407 0 469 13
Common Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Effect of nonvested restricted stock units (in shares) 0 0 0 0