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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, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,091,278	$ 2,084,564
Acquisitions	1,397,338	0
Currency exchange	(7,619)	6,714
Goodwill, ending balance	3,480,997	2,091,278
Las Vegas Strip Resorts
Goodwill [Roll Forward]
Goodwill, beginning balance	30,452	30,452
Acquisitions	1,397,338	0
Currency exchange	0	0
Goodwill, ending balance	1,427,790	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	(7,619)	6,714
Goodwill, ending balance	$ 1,351,744	$ 1,359,363

X

- Definition

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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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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