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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Changes in Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 3,480,997	$ 2,091,278
Acquisitions	1,527,508	1,397,338
Reclassifications	(50,772)
Reclassifications		0
Currency exchange	(12,545)	(7,619)
Goodwill, ending balance	4,945,188	3,480,997
Corporate, Non-Segment
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Acquisitions	238,040
Reclassifications	0
Currency exchange	(3,382)
Goodwill, ending balance	234,658	0
Las Vegas Strip Resorts
Goodwill [Roll Forward]
Goodwill, beginning balance	1,427,790	30,452
Acquisitions		1,397,338
Reclassifications		0
Currency exchange		0
Goodwill, ending balance		1,427,790
Las Vegas Strip Resorts | Reportable segments
Goodwill [Roll Forward]
Goodwill, beginning balance	1,427,790
Acquisitions	1,289,468
Reclassifications	(10,249)
Currency exchange	0
Goodwill, ending balance	2,707,009	1,427,790
Regional Operations
Goodwill [Roll Forward]
Goodwill, beginning balance	701,463	701,463
Acquisitions		0
Reclassifications		0
Currency exchange		0
Goodwill, ending balance		701,463
Regional Operations | Reportable segments
Goodwill [Roll Forward]
Goodwill, beginning balance	701,463
Acquisitions	0
Reclassifications	(40,523)
Currency exchange	0
Goodwill, ending balance	660,940	701,463
MGM China
Goodwill [Roll Forward]
Goodwill, beginning balance	1,351,744	1,359,363
Acquisitions		0
Reclassifications		0
Currency exchange		(7,619)
Goodwill, ending balance		1,351,744
MGM China | Reportable segments
Goodwill [Roll Forward]
Goodwill, beginning balance	1,351,744
Acquisitions	0
Reclassifications	0
Currency exchange	(9,163)
Goodwill, ending balance	$ 1,342,581	$ 1,351,744

X

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