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Intangible Assets, Goodwill and Other - Goodwill by Segment (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 27, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,091,278	$ 2,084,564
Acquisitions	1,399,484	0
Currency exchange	(5,796)	6,714
Goodwill, ending balance	3,484,966	2,091,278
City Center Holdings L L C
Goodwill [Roll Forward]
Ownership interest acquired			50.00%
Las Vegas Strip Resorts
Goodwill [Roll Forward]
Goodwill, beginning balance	30,452	30,452
Acquisitions	1,399,484	0
Currency exchange	0	0
Goodwill, ending balance	1,429,936	30,452
Regional Operations
Goodwill [Roll Forward]
Goodwill, beginning balance	701,463	701,463
Acquisitions	0	0
Currency exchange	0	0
Goodwill, ending balance	701,463	701,463
MGM China
Goodwill [Roll Forward]
Goodwill, beginning balance	1,359,363	1,352,649
Acquisitions	0	0
Currency exchange	(5,796)	6,714
Goodwill, ending balance	$ 1,353,567	$ 1,359,363

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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