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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% |  |  |

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