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Name:	srt_EnergyAxis=mgm_DevelopmentAndManagementServicesMember
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Related Party Transactions - Additional Information (Detail) shares in Thousands, $ in Thousands									1 Months Ended		2 Months Ended	12 Months Ended
	Apr. 01, 2021 USD ($)	Apr. 01, 2020 USD ($)	Feb. 14, 2020 USD ($)	Apr. 01, 2019 USD ($) shares	Mar. 07, 2019 USD ($)	Jan. 29, 2019 USD ($)	Jan. 02, 2019 USD ($)	Sep. 01, 2016 USD ($) shares	Oct. 31, 2021 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) term	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Net revenues												$ 9,680,140	$ 5,162,082	$ 12,899,672
Other accrued liabilities											$ 1,983,444	$ 1,983,444	1,545,079
Initial lease term												10 years
Extension term												5 years
Lease, number of extensions \| term												4
Lease, additional extended terms												5 years
Increase in annual rent payment		$ 828,000
Annual fixed rent, percentage		2.00%
Annual rent	$ 828,000	$ 813,000							$ 843,000		$ 873,000
Empire City
Related Party Transaction [Line Items]
Total purchase price						$ 865,000
Empire City \| Developed Real Property
Related Party Transaction [Line Items]
Total purchase price										$ 634,000
Liabilities incurred for acquisition										246,000
Increase in annual rent payment										$ 50,000
Annual fixed rent, percentage										90.00%
Increase in annual rent per year, percentage										2.00%
Northfield OpCo
Related Party Transaction [Line Items]
Total purchase price				$ 305,000
Base Rent
Related Party Transaction [Line Items]
Percentage of initial total rent payments due												91.00%
Additional annual rent escalator percentage												2.00%
Fixed annual rent escalator percentage											2.00%	2.00%
Percentage Rent
Related Party Transaction [Line Items]
Percentage of initial total rent payments due												9.00%
Master Lease
Related Party Transaction [Line Items]
Fixed annual rent escalator percentage				2.00%
Total purchase price					$ 638,000
Increase in annual rent payment					$ 50,000
Annual fixed rent, percentage		2.00%			90.00%
Increase in annual rent per year, percentage					2.00%				2.00%
Purchase price in cash					$ 606,000				$ 400,000
Annual rent			$ 813,000	$ 946,000						$ 770,000
Decrease in annual rent payment			$ 133,000
Lessee, operating lease, annual rent expense									30,000
Fixed annual rent									$ 27,000
Master Lease \| Empire City
Related Party Transaction [Line Items]
Increase in additional rent payment							$ 50,000
Master Lease \| Northfield OpCo
Related Party Transaction [Line Items]
Increase in annual rent payment				$ 60,000
Annual fixed rent, percentage				90.00%
Increase in annual rent per year, percentage				2.00%
Master Lease \| MGM Northfield Park
Related Party Transaction [Line Items]
Increase in additional rent payment				$ 60,000
MGM China
Related Party Transaction [Line Items]
Ordinary shares acquired \| shares								188,100
Grand Paradise Macau
Related Party Transaction [Line Items]
Deferred cash payment								$ 50,000
Grand Paradise Macau \| Other Accrued Liabilities
Related Party Transaction [Line Items]
Other accrued liabilities													33,000
MGM Branding and Development
Related Party Transaction [Line Items]
Distribution made to noncontrolling interests												$ 8,000	5,000	20,000
MGM Growth Properties LLC \| Northfield OpCo
Related Party Transaction [Line Items]
Redemption of operating partnership units \| shares				9,000
Shun Tak
Related Party Transaction [Line Items]
Expenses incurred												$ 7,000	7,000	16,000
Ms Ho Pansy Catilina Chiu King \| MGM China
Related Party Transaction [Line Items]
Percentage ownership interest											50.00%	50.00%
Ms Ho Pansy Catilina Chiu King \| MGM China \| Marketing and public Relations Consulting Services
Related Party Transaction [Line Items]
Expenses incurred												$ 4,000	1,000	4,000
Blackstone Real Estate Income Trust \| MGP \| Lease Agreements
Related Party Transaction [Line Items]
Ownership interest											50.10%	50.10%
Blackstone Real Estate Income Trust \| Bellagio BREIT Venture \| Real Estate Assets and Leases
Related Party Transaction [Line Items]
Ownership interest											5.00%	5.00%
CityCenter Holdings, LLC
Related Party Transaction [Line Items]
Net revenues												$ 29,000	16,000	48,000
Reimbursable costs for support services provided												$ 187,000	212,000	$ 420,000
CityCenter Holdings, LLC \| Aria and Vdara
Related Party Transaction [Line Items]
Management fee as a percentage of revenue												2.00%
Management fee received, percentage of EBITDA												5.00%
CityCenter Holdings, LLC \| Management Services and Reimbursable Costs
Related Party Transaction [Line Items]
Receivable related to management services and reimbursable costs													$ 39,000