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ACQUISITIONS AND DIVESTITURES - Pro Forma Financial Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]        
Net revenues $ 3,416,072 $ 3,208,590 $ 9,958,088 $ 7,762,826
Net income (loss) attributable to MGM Resorts International $ (576,830) $ 226,231 $ 1,203,246 $ 37,454