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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Feb. 14, 2020 | Feb. 13, 2020 | Feb. 29, 2020 | Mar. 31, 2019 | Jan. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Apr. 30, 2020 | May 31, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock repurchases, value |  |  |  |  |  |  | $ 353,720,000 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  |  |  |  |  | 10,861,000 |  |  |
Common stock repurchases, value |  |  |  |  |  |  | $ 109,000 |  |  |
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase | $ 2,000,000,000.0 |  |  |  |  |  | 2,000,000,000.0 |  |  | $ 2,000,000,000.0
Repurchase of common stock, remaining amount | 4,000,000 |  |  |  |  |  | 4,000,000 |  |  |
Share Repurchase Program Two [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase | 3,000,000,000.0 |  |  | $ 3,000,000,000.0 |  |  | 3,000,000,000.0 |  |  |
Repurchase of common stock, remaining amount | $ 3,000,000,000.0 |  |  |  |  |  | $ 3,000,000,000.0 |  |  |
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  |  |  |  |  | 11,000,000 | 0 |  |
Stock repurchased, average price per share |  |  |  |  |  |  | $ 32.57 |  |  |
Common stock repurchases, value |  |  |  |  |  |  | $ 354,000,000 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared per share |  |  |  |  |  |  |  |  | $ 0.0025 |
MGP BREIT Venture [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  | 3,000,000 |  | 3,000,000 |  |  |  |  |  |
Partnership interest |  | 50.10% |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership interest | 60.60% | 60.30% | 61.20% |  | 69.80% | 74.60% | 60.60% |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  | 5,000,000 | 13,000,000 |  |  | 20,000,000 |  |  |  |
Partnership interest |  |  |  |  |  | 69.70% |  |  |  |
New issuance of shares |  |  |  |  |  | 20,000,000 |  |  |  |
Number of forward shares settled |  | 5,000,000 | 13,000,000 |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Empire City [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  | 13,000,000 |  |  |  |
MGM Growth Properties LLC [Member] | Park MGM [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  | 1,000,000 |  |  |  |  |

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