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Leases - Schedule of Components of Lease Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Line Items]        
Operating lease cost, primarily classified within "General and administrative" $ 201,265 $ 199,166 $ 599,219 $ 551,807
Interest expense 1,186 (5,990) 134 (19,796)
Amortization expense 17,785 17,851 53,271 52,495
Total finance lease costs 18,971 11,861 53,405 32,699
Bellagio BREIT Venture        
Leases [Line Items]        
Operating lease cost, primarily classified within "General and administrative" 83,000 83,000 248,000 248,000
Mandalay Bay and MGM Grand Las Vegas        
Leases [Line Items]        
Operating lease cost, primarily classified within "General and administrative" $ 99,000 $ 99,000 $ 296,000 $ 248,000