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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Total assets $ 41,338,323   $ 41,338,323   $ 36,494,934
Investments in and advances to unconsolidated affiliates 941,145   $ 941,145   $ 1,447,043
Percentage of ownership interest     100.00%    
Fair value of equity investment 76,000   $ 76,000    
MGM Growth Properties LLC          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Total assets 10,100,000   10,100,000    
Total liabilities 5,000,000   5,000,000    
Other, Net          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Gain on change in measurement of equity instrument 48,000   39,000    
Food and Beverage Revenue          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Lease revenue 13,000 $ 7,000 29,000 $ 21,000  
Entertainment Retail and Other Revenue          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Lease revenue 22,000 $ 14,000 $ 58,000 $ 47,000  
Bellagio Blackstone Real Estate Income Trust          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Percentage of ownership interest     5.00%    
Investments in and advances to unconsolidated affiliates $ 58,000   $ 58,000