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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Changes in Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 3,480,997	$ 2,091,278
Acquisitions/Divestitures	1,567,586
Acquisitions		1,397,338
Reclassifications	(40,523)
Reclassifications		0
Currency exchange	21,252	(7,619)
Goodwill, ending balance	5,029,312	3,480,997
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
Regional Operations
Goodwill [Roll Forward]
Goodwill, beginning balance	701,463	701,463
Acquisitions		0
Reclassifications		0
Currency exchange		0
Goodwill, ending balance		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
Reportable segments | Las Vegas Strip Resorts
Goodwill [Roll Forward]
Goodwill, beginning balance	1,427,790
Acquisitions/Divestitures	1,279,219
Reclassifications	0
Currency exchange	0
Goodwill, ending balance	2,707,009	1,427,790
Reportable segments | Regional Operations
Goodwill [Roll Forward]
Goodwill, beginning balance	701,463
Acquisitions/Divestitures	0
Reclassifications	(40,523)
Currency exchange	0
Goodwill, ending balance	660,940	701,463
Reportable segments | MGM China
Goodwill [Roll Forward]
Goodwill, beginning balance	1,351,744
Acquisitions/Divestitures	0
Reclassifications	0
Currency exchange	(866)
Goodwill, ending balance	1,350,878	1,351,744
Corporate, Non-Segment
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Acquisitions/Divestitures	288,367
Reclassifications	0
Currency exchange	22,118
Goodwill, ending balance	$ 310,485	$ 0

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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