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Stockholders' Equity - Summary of Net Income Attributable to and Transfers from Noncontrolling Interest, Which Shows Effects of Changes in Company's Ownership Interest in a Subsidiary (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stockholders Equity Note [Line Items]      
Net income (loss) attributable to MGM Resorts International $ (1,032,724) $ 2,049,146 $ 466,772
Transfers from/(to) noncontrolling interest:      
Other (1,759) (935) (5,667)
Redemption of Operating Partnership units 92,632 0 0
Net transfers from/(to) noncontrolling interest 149,145 152,034 (5,667)
Change from net income attributable to MGM Resorts International and transfers to noncontrolling interest (883,579) 2,201,180 461,105
Empire City [Member]      
Transfers from/(to) noncontrolling interest:      
Net transfers from/(to) noncontrolling interest 0 (18,718) 0
Park MGM [Member]      
Transfers from/(to) noncontrolling interest:      
Net transfers from/(to) noncontrolling interest 0 (1,968) 0
Northfield OpCo [Member]      
Transfers from/(to) noncontrolling interest:      
Net transfers from/(to) noncontrolling interest 0 21,679 0
MGM Growth Properties LLC [Member] | Class A shares [Member]      
Transfers from/(to) noncontrolling interest:      
MGP Class A share issuances 64,834 151,976 0
MGP BREIT Venture [Member]      
Transfers from/(to) noncontrolling interest:      
Net transfers from/(to) noncontrolling interest $ (6,562) $ 0 $ 0