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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Changes in Company's Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 5,145,004
Impairment	$ (256,133)	$ 0	(256,133)	$ 0
Currency exchange			53,688
Goodwill, ending balance	4,942,559		4,942,559
Empire City Reporting Unit
Goodwill [Roll Forward]
Impairment	(256,000)
Reportable Segments | Las Vegas Strip Resorts
Goodwill [Roll Forward]
Goodwill, beginning balance			2,707,009
Impairment			0
Currency exchange			0
Goodwill, ending balance	2,707,009		2,707,009
Reportable Segments | Regional Operations
Goodwill [Roll Forward]
Goodwill, beginning balance			660,940
Impairment			(256,133)
Currency exchange			0
Goodwill, ending balance	404,807		404,807
Reportable Segments | MGM China
Goodwill [Roll Forward]
Goodwill, beginning balance			1,356,625
Impairment			0
Currency exchange			(2,398)
Goodwill, ending balance	1,354,227		1,354,227
Reportable Segments | MGM Digital
Goodwill [Roll Forward]
Goodwill, beginning balance			420,430
Impairment			0
Currency exchange			56,086
Goodwill, ending balance	$ 476,516		$ 476,516

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