GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in Company's Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 5,165,694	$ 5,029,312
Acquisitions	215	125,612
Currency exchange	(20,905)	10,770
Goodwill, ending balance	5,145,004	5,165,694
Reportable segments | Las Vegas Strip Resorts
Goodwill [Roll Forward]
Goodwill, beginning balance	2,707,009	2,707,009
Acquisitions	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	660,940
Acquisitions	0	0
Currency exchange	0	0
Goodwill, ending balance	660,940	660,940
Reportable segments | MGM China
Goodwill [Roll Forward]
Goodwill, beginning balance	1,349,356	1,350,878
Acquisitions	0	0
Currency exchange	7,269	(1,522)
Goodwill, ending balance	1,356,625	1,349,356
Reportable segments | MGM Digital
Goodwill [Roll Forward]
Goodwill, beginning balance	448,389	310,485
Acquisitions	215	125,612
Currency exchange	(28,174)	12,292
Goodwill, ending balance	$ 420,430	$ 448,389