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Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Leases [Line Items]    
Operating lease right-of-use assets, net $ 8,208,972 $ 8,286,694
Operating lease liabilities - long-term 8,403,862 8,390,117
Bellagio BREIT Venture [Member]    
Leases [Line Items]    
Operating lease right-of-use assets, net 3,600,000 3,700,000
Operating lease liabilities - long-term 3,800,000 3,800,000
Mandalay Bay and MGM Grand Las Vegas [Member]    
Leases [Line Items]    
Operating lease right-of-use assets, net 4,000,000 4,000,000
Operating lease liabilities - long-term $ 4,100,000 $ 4,100,000