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Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Leases [Line Items]    
Operating lease right-of-use assets, net $ 8,330,530 $ 4,392,481
Operating lease liabilities - long-term 8,380,341 4,277,970
Bellagio [Member]    
Leases [Line Items]    
Operating lease right-of-use assets, net 3,700,000 3,700,000
Operating lease liabilities - long-term 3,800,000 3,700,000
Mandalay Bay and MGM Grand Las Vegas [Member]    
Leases [Line Items]    
Operating lease right-of-use assets, net 4,100,000 0
Operating lease liabilities - long-term $ 4,100,000 $ 0