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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Total assets $ 36,776,378   $ 36,776,378   $ 36,494,934
Investments in and advances to unconsolidated affiliates 1,484,717   $ 1,484,717   $ 1,447,043
Percentage of ownership interest     100.00%    
Fair value of equity investment 124,000   $ 124,000    
Other, Net [Member]          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Gain on change in measurement of equity instrument 86,000   86,000    
Food and Beverage Revenue [Member]          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Lease revenue 11,000 $ 5,000 16,000 $ 15,000  
Entertainment Retail and Other Revenue [Member]          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Lease revenue 20,000 $ 14,000 $ 36,000 $ 33,000  
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 59,000   $ 59,000    
MGM Growth Properties LLC [Member]          
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