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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Goodwill And Intangible Assets [Line Items] |  |  |
Goodwill | $ 5,142,838 | $ 5,029,312 | $ 3,480,997
Total indefinite-lived intangible assets | 1,134,655 | 1,139,491 |
Finite-lived intangible assets, net | 598,724 | 411,761 |
Other intangible assets, net | 1,733,379 | 1,551,252 |
Gaming Subconcession | M G M Grand Paradise |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 0 | 4,519,486 |
Less: Accumulated amortization | 0 | (4,519,486) |
Finite-lived intangible assets, net | 0 | 0 |
Customer lists |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 299,732 | 283,232 |
Less: Accumulated amortization | (93,761) | (60,055) |
Finite-lived intangible assets, net | 205,971 | 223,177 |
Gaming rights |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 332,591 | 106,600 |
Less: Accumulated amortization | (55,583) | (33,316) |
Finite-lived intangible assets, net | 277,008 | 73,284 |
Technology and other |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 148,307 | 129,061 |
Less: Accumulated amortization | (32,562) | (13,761) |
Finite-lived intangible assets, net | 115,745 | 115,300 |
Trademarks |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | 752,537 | 754,431 |
Gaming rights and other |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | $ 382,118 | $ 385,060 |

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