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Intangible Assets, Goodwill and Other - Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets [Line Items]      
Goodwill $ 3,484,966 $ 2,091,278 $ 2,084,564
Indefinite-lived intangible assets:      
Indefinite-lived intangible assets 857,336 677,336  
Finite-Lived Intangible Assets, Net [Abstract]      
Total finite-lived intangible assets, net 2,811,771 2,966,412  
Total other intangible assets, net 3,669,107 3,643,748  
MGM Grand Paradise gaming subconcession      
Finite-Lived Intangible Assets, Net [Abstract]      
Finite-lived intangible assets, gross 4,522,623 4,541,990  
Less: Accumulated amortization (1,823,362) (1,697,481)  
Total finite-lived intangible assets, net 2,699,261 2,844,509  
MGM National Harbor and MGM Springfield gaming licenses      
Finite-Lived Intangible Assets, Net [Abstract]      
Finite-lived intangible assets, gross 106,600 106,600  
Less: Accumulated amortization (24,432) (19,102)  
Total finite-lived intangible assets, net 82,168 87,498  
Other finite-lived intangible assets      
Finite-Lived Intangible Assets, Net [Abstract]      
Finite-lived intangible assets, gross 65,207 60,649  
Less: Accumulated amortization (34,865) (26,244)  
Total finite-lived intangible assets, net 30,342 34,405  
Detroit development rights      
Indefinite-lived intangible assets:      
Indefinite-lived intangible assets 98,098 98,098  
MGM Northfield Park and Empire City racing and gaming licenses      
Indefinite-lived intangible assets:      
Indefinite-lived intangible assets 280,000 280,000  
Trademarks and other      
Indefinite-lived intangible assets:      
Indefinite-lived intangible assets $ 479,238 $ 299,238