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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 5,029,312 | $ 3,480,997
Acquisitions/Divestitures | 125,612 | 1,567,586
Reclassifications | 0 | (40,523)
Currency exchange | (12,086) | 21,252
Goodwill, ending balance | 5,142,838 | 5,029,312
Reportable segments | Las Vegas Strip Resorts |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 2,707,009 | 1,427,790
Acquisitions/Divestitures | 0 | 1,279,219
Reclassifications | 0 | 0
Currency exchange | 0 | 0
Goodwill, ending balance | 2,707,009 | 2,707,009
Reportable segments | Regional Operations |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 660,940 | 701,463
Acquisitions/Divestitures | 0 | 0
Reclassifications | 0 | (40,523)
Currency exchange | 0 | 0
Goodwill, ending balance | 660,940 | 660,940
Reportable segments | MGM China |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 1,350,878 | 1,351,744
Acquisitions/Divestitures | 0 | 0
Reclassifications | 0 | 0
Currency exchange | (5,011) | (866)
Goodwill, ending balance | 1,345,867 | 1,350,878
Corporate and other |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 310,485 | 0
Acquisitions/Divestitures | 125,612 | 288,367
Reclassifications | 0 | 0
Currency exchange | (7,075) | 22,118
Goodwill, ending balance | $ 429,022 | $ 310,485

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