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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 15, 2021
Nov. 03, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Feb. 29, 2020
May 31, 2018
Stockholders Equity Note [Line Items]                  
Cash proceeds for redemption           $ 50,828,000 $ 3,205,000    
Repurchases of common stock       $ 686,533,000   $ 1,026,194,000 $ 353,720,000    
Common Stock                  
Stockholders Equity Note [Line Items]                  
Repurchases of common stock (in shares)       17,210,000   25,942,000 10,861,000    
Repurchases of common stock       $ 172,000   $ 259,000 $ 109,000    
Share Repurchase Program One | Common Stock                  
Stockholders Equity Note [Line Items]                  
Authorized amount of stock repurchase                 $ 2,000,000,000
Share Repurchase Program Two | Common Stock                  
Stockholders Equity Note [Line Items]                  
Authorized amount of stock repurchase               $ 3,000,000,000  
Repurchase of common stock, remaining amount       $ 2,000,000,000   $ 2,000,000,000      
Share Repurchase Program | Common Stock                  
Stockholders Equity Note [Line Items]                  
Repurchases of common stock (in shares)       17,000,000 0 26,000,000 11,000,000    
Average stock repurchased price (in dollars per share)       $ 39.89   $ 39.56 $ 32.57    
Repurchases of common stock       $ 687,000,000   $ 1,000,000,000 $ 354,000,000    
Subsequent Event                  
Stockholders Equity Note [Line Items]                  
Quarterly dividends (in dollars per share)   $ 0.0025              
Subsequent Event | Share Repurchase Program | Common Stock                  
Stockholders Equity Note [Line Items]                  
Repurchases of common stock (in shares)   2,000,000              
Average stock repurchased price (in dollars per share)   $ 44.51              
Repurchases of common stock   $ 80,000,000              
MGM Growth Properties LLC | Operating Partnership                  
Stockholders Equity Note [Line Items]                  
Partnership interest 42.10%   42.10%            
Operating partnership units redeemed (in shares)     37,000,000            
Operating partnership units redeemed for cash (in shares)     15,000,000            
Operating partnership units redeemed for Class A offering (in shares)     22,000,000            
Cash proceeds for redemption     $ 1,200,000,000            
MGM Growth Properties LLC | Class A shares                  
Stockholders Equity Note [Line Items]                  
New issuance of common stock (in shares) 22,000,000     100,000   3,000,000      
MGM Growth Properties LLC | Class A shares | Operating Partnership                  
Stockholders Equity Note [Line Items]                  
Partnership interest       41.60%   41.60%