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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Investment Income Statement Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule of Equity Method Investments [Line Items]        
Revenues $ 436,736 $ 443,247 $ 842,533 $ 854,604
Expenses 451,023 450,739 888,636 840,993
Net income 507,839 210,633 437,169 (3,935)
Net income attributable to MGM $ 506,851 $ 211,452 434,969 (5,353)
MGM        
Schedule of Equity Method Investments [Line Items]        
Revenues     8,905,711 8,681,952
Expenses     8,136,697 7,905,294
Net income     497,581 344,825
Net income attributable to MGM     $ 417,569 $ 197,505