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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2021 | Aug. 03, 2021 | Mar. 15, 2021 | Mar. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Feb. 29, 2020 | May 31, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  |  |  |  |  | $ 3,205,000 | $ 50,828,000 | $ 3,205,000 |  |
Common stock repurchases, value |  |  |  |  | $ 220,392,000 |  | 339,661,000 | 353,720,000 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |
Common stock repurchases, Shares |  |  |  |  | 5,582 |  | 8,732 | 10,861 |  |
Common stock repurchases, value |  |  |  |  | $ 56,000 |  | $ 87,000 | $ 109,000 |  |
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase |  |  |  |  |  |  |  |  |  | $ 2,000,000,000.0
Share Repurchase Program Two [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase |  |  |  |  |  |  |  |  | $ 3,000,000,000.0 |
Repurchase of common stock, remaining amount |  |  |  |  | $ 2,700,000,000 |  | $ 2,700,000,000 |  |  |
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  |  |  | 6,000 | 0 | 9,000 | 11,000 |  |
Stock repurchased, average price per share |  |  |  |  | $ 39.48 |  | $ 38.90 | $ 32.57 |  |
Common stock repurchases, value |  |  |  |  | $ 220,000,000 |  | $ 340,000,000 | $ 354,000,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend declared date | Aug. 04, 2021 |  |  |  |  |  |  |  |  |
Dividends declared per share | $ 0.0025 |  |  |  |  |  |  |  |  |
Dividend paid date | Sep. 15, 2021 |  |  |  |  |  |  |  |  |
Dividend record date | Sep. 10, 2021 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  | 7,000 |  |  |  |  |  |  |  |
Stock repurchased, average price per share |  | $ 38.72 |  |  |  |  |  |  |  |
Common stock repurchases, value |  | $ 275,000,000 |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Operating Partnership [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership interest |  |  | 42.10% | 42.10% |  |  |  |  |  |
Operating partnership units, redeemed |  |  |  | 37,000 |  |  |  |  |  |
Operating partnership units, redeemed for cash |  |  |  | 15,000 |  |  |  |  |  |
Operating partnership units, redeemed for Class A offering |  |  |  | 22,000 |  |  |  |  |  |
Cash proceeds for redemption |  |  |  | $ 1,200,000,000 |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
New issuance of shares |  |  | 22,000 |  | 3,000 |  |  |  |  |
Issuance of operating partnership units |  |  |  |  | 3,000 |  |  |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] | Operating Partnership [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership interest |  | 41.60% |  |  |  |  |  |  |  |

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