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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets [Line Items]      
Goodwill $ 2,091,278 $ 2,084,564 $ 1,821,392
Total indefinite-lived intangible assets 677,336 678,310  
Finite-lived intangible assets, net 2,966,412 3,148,194  
Total other intangible assets, net 3,643,748 3,826,504  
Trademarks And Other      
Goodwill And Intangible Assets [Line Items]      
Total indefinite-lived intangible assets 299,238 300,212  
Other Finite-lived Intangible Assets [Member]      
Goodwill And Intangible Assets [Line Items]      
Finite-lived intangible assets, gross 60,649 79,197  
Less: Accumulated amortization (26,244) (30,393)  
Finite-lived intangible assets, net 34,405 48,804  
MGM Northfield Park and Empire City [Member] | Racing and Gaming Licenses [Member]      
Goodwill And Intangible Assets [Line Items]      
Total indefinite-lived intangible assets 280,000 280,000  
Detroit Wholly Owned Subsidiary | Development Rights [Member]      
Goodwill And Intangible Assets [Line Items]      
Total indefinite-lived intangible assets 98,098 98,098  
MGM Grand Paradise [Member] | Gaming Sub-concession [Member]      
Goodwill And Intangible Assets [Line Items]      
Finite-lived intangible assets, gross 4,541,990 4,519,558  
Less: Accumulated amortization (1,697,481) (1,514,772)  
Finite-lived intangible assets, net 2,844,509 3,004,786  
MGM National Harbor and MGM Springfield Gaming Licenses [Member]      
Goodwill And Intangible Assets [Line Items]      
Finite-lived intangible assets, gross 106,600 106,600  
Less: Accumulated amortization (19,102) (11,996)  
Finite-lived intangible assets, net $ 87,498 $ 94,604