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Related Party Transactions - Additional Information (Detail) $ in Thousands, shares in Millions								1 Months Ended	2 Months Ended	12 Months Ended
	Apr. 01, 2020 USD ($)	Feb. 14, 2020 USD ($)	Apr. 01, 2019 USD ($)	Mar. 07, 2019 USD ($) shares	Jan. 29, 2019 USD ($)	Jan. 02, 2019 USD ($)	Sep. 01, 2016 USD ($) shares	Jan. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Term	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Revenues										$ 5,162,082	$ 12,899,672	$ 11,763,096
Other accrued liabilities										$ 1,545,079	2,024,002
Initial lease term										10 years
Lease, number of extensions \| Term										4
Lease, additional extended terms										5 years
Leasing arrangement description of rent										the possibility for additional 2% increases thereafter subject to the Company meeting an adjusted net revenue to rent ratio, as well as potential increases in percentage rent in year six and every five years thereafter based on a percentage of average actual annual net revenue during the preceding five year period calculated in accordance with the terms under the master lease
Total purchase price				$ 638,000
Purchase price in cash				606,000
Empire City [Member]
Related Party Transaction [Line Items]
Total purchase price					$ 865,000
Empire City [Member] \| Developed Real Property [Member]
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 [Member]
Related Party Transaction [Line Items]
Total purchase price				305,000
Base Rent [Member]
Related Party Transaction [Line Items]
Percentage of initial total rent payments due										91.00%
Fixed annual rent escalator percentage										2.00%
Additional annual rent escalator percentage										2.00%
Percentage Rent [Member]
Related Party Transaction [Line Items]
Percentage of initial total rent payments due										9.00%
Master Lease [Member]
Related Party Transaction [Line Items]
Fixed annual rent escalator percentage			2.00%
Increase in annual rent payment				$ 50,000
Annual fixed rent, percentage	2.00%			90.00%
Increase in annual rent per year, percentage				2.00%
Annual rent	$ 828,000	$ 813,000	$ 946,000					$ 770,000	$ 813,000
Decrease in annual rent payment		$ 133,000
Master Lease [Member] \| Empire City [Member]
Related Party Transaction [Line Items]
Increase in additional rent payment						$ 50,000
Master Lease [Member] \| Northfield OpCo [Member]
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 [Member] \| MGM Northfield Park [Member]
Related Party Transaction [Line Items]
Increase in additional rent payment			$ 60,000
MGM China [Member]
Related Party Transaction [Line Items]
Advertising expenses										$ 1,000	6,000
Ordinary shares acquired \| shares							188.1
Grand Paradise Macau [Member]
Related Party Transaction [Line Items]
Deferred cash payment							$ 50,000
Grand Paradise Macau [Member] \| Other Accrued Liabilities [Member]
Related Party Transaction [Line Items]
Other accrued liabilities											33,000
Grand Paradise Macau [Member] \| Other Long-Term Obligations [Member]
Related Party Transaction [Line Items]
Other liabilities on discounted basis										34,000
MGM Growth Properties LLC [Member] \| Northfield OpCo [Member]
Related Party Transaction [Line Items]
Redemption of operating partnership units \| shares				9.0
Shun Tak [Member] \| MGM China [Member]
Related Party Transaction [Line Items]
Expenses incurred										7,000	16,000	17,000
Ms Ho Pansy Catilina Chiu King [Member] \| MGM Branding and Development [Member]
Related Party Transaction [Line Items]
Distribution made to noncontrolling interests										$ 5,000	20,000	22,000
Blackstone Real Estate Income Trust [Member] \| MGP [Member] \| Lease Agreements [Member]
Related Party Transaction [Line Items]
Ownership interest										50.10%
Blackstone Real Estate Income Trust [Member] \| Bellagio BREIT Venture [Member] \| Real Estate Assets and Leases [Member]
Related Party Transaction [Line Items]
Ownership interest										5.00%
CityCenter Holdings, LLC [Member]
Related Party Transaction [Line Items]
Revenues										$ 16,000	48,000	47,000
CityCenter Holdings, LLC [Member] \| Aria and Vdara [Member]
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 [Member] \| Management Services and Reimbursable Costs [Member]
Related Party Transaction [Line Items]
Reimbursable costs for support services provided										$ 212,000	420,000	$ 409,000
Receivable related to management services and reimbursable costs										$ 39,000	$ 66,000