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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Changes in Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 3,480,997 | $ 2,091,278
Acquisitions | 1,284,309 | 1,397,338
Reclassifications |  | 0
Reclassifications | (50,772) |
Currency exchange | (8,692) | (7,619)
Goodwill, ending balance | 4,705,842 | 3,480,997
Las Vegas Strip Resorts |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 1,427,790 | 30,452
Acquisitions | 1,284,309 | 1,397,338
Reclassifications |  | 0
Reclassifications | (10,249) |
Currency exchange | 0 | 0
Goodwill, ending balance | 2,701,850 | 1,427,790
Regional Operations |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 701,463 | 701,463
Acquisitions | 0 | 0
Reclassifications |  | 0
Reclassifications | (40,523) |
Currency exchange | 0 | 0
Goodwill, ending balance | 660,940 | 701,463
MGM China |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 1,351,744 | 1,359,363
Acquisitions | 0 | 0
Reclassifications |  | 0
Reclassifications | 0 |
Currency exchange | (8,692) | (7,619)
Goodwill, ending balance | $ 1,343,052 | $ 1,351,744

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