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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Changes in Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 3,480,997	$ 2,091,278
Acquisitions	1,284,309	1,397,338
Reclassifications		0
Reclassifications	(50,772)
Currency exchange	(8,692)	(7,619)
Goodwill, ending balance	4,705,842	3,480,997
Las Vegas Strip Resorts
Goodwill [Roll Forward]
Goodwill, beginning balance	1,427,790	30,452
Acquisitions	1,284,309	1,397,338
Reclassifications		0
Reclassifications	(10,249)
Currency exchange	0	0
Goodwill, ending balance	2,701,850	1,427,790
Regional Operations
Goodwill [Roll Forward]
Goodwill, beginning balance	701,463	701,463
Acquisitions	0	0
Reclassifications		0
Reclassifications	(40,523)
Currency exchange	0	0
Goodwill, ending balance	660,940	701,463
MGM China
Goodwill [Roll Forward]
Goodwill, beginning balance	1,351,744	1,359,363
Acquisitions	0	0
Reclassifications		0
Reclassifications	0
Currency exchange	(8,692)	(7,619)
Goodwill, ending balance	$ 1,343,052	$ 1,351,744

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