Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Total assets	$ 37,330,767		$ 36,494,934
Investments in and advances to unconsolidated affiliates	$ 1,439,454		$ 1,447,043
Percentage of ownership interest	100.00%
Food and Beverage Revenue [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Lease revenue	$ 4,000	$ 10,000
Entertainment Retail and Other Revenue [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Lease revenue	$ 16,000	$ 19,000
Bellagio Blackstone Real Estate Income Trust [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of ownership interest	5.00%
Investments in and advances to unconsolidated affiliates	$ 60,000
MGM Growth Properties LLC [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Total assets	10,100,000
Total liabilities	$ 5,000,000