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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Percentage of ownership interest     100.00%    
Total assets $ 37,004,775   $ 37,004,775   $ 33,876,356
Investments in and advances to unconsolidated affiliates 1,473,955   1,473,955   $ 822,366
Commissions, complimentaries and other incentives $ 276,000 $ 687,000 $ 801,000 $ 1,900,000  
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true   true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2020   Jan. 01, 2020    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true   true    
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201613Member    
Food and Beverage Revenue [Member]          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Lease revenue $ 7,000 14,000 $ 21,000 39,000  
Entertainment Retail and Other Revenue [Member]          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Lease revenue 14,000 $ 22,000 $ 47,000 $ 67,000  
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   $ 60,000    
MGM Growth Properties LLC [Member]          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Total assets 10,700,000   10,700,000    
Total liabilities $ 4,400,000   $ 4,400,000