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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 10, 2021 | Dec. 02, 2020 | May 18, 2020 | Feb. 14, 2020 | Feb. 13, 2020 | Nov. 22, 2019 | Mar. 07, 2019 | Jan. 29, 2019 | Feb. 29, 2020 | Apr. 30, 2019 | Jan. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating partnership units, redeemed |  | 24,000 | 30,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  | $ 700,000,000 | $ 700,000,000 |  |  |  |  |  |  |  |  | $ 22,292,000 |  |  |
Common stock repurchases, value |  |  |  |  |  |  |  |  |  |  |  | 353,720,000 | $ 1,031,534,000 | $ 1,283,333,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Common stock repurchases, Shares |  |  |  |  |  |  |  |  |  |  |  | 10,861 | 35,854 | 41,076 |
Common stock repurchases, value |  |  |  |  |  |  |  |  |  |  |  | $ 109,000 | $ 358,000 | $ 411,000 |
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
Repurchase of common stock, remaining amount |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |
Repurchase of common stock, remaining amount |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000.0 |  |  |
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  |  |  |  |  |  |  |  |  |  | 11,000 | 36,000 |  |
Stock repurchased, average price per share |  |  |  |  |  |  |  |  |  |  |  | $ 32.57 | $ 28.77 |  |
Common stock repurchases, value |  |  |  |  |  |  |  |  |  |  |  | $ 354,000,000 | $ 1,000,000,000.0 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date | Feb. 10, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share | $ 0.0025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid date | Mar. 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date | Mar. 10, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MGP BREIT Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  | 3,000 |  |  |  |  | 3,000 |  |  |  |  |  |
Northfield Park associates LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  |  |  |  |  | 9,000 |  |  |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  | 5,000 | 13,000 | 18,000 |  |  |  |  | 20,000 |  | 5,000 |  |
New issuance of shares |  |  |  | 5,000 | 13,000 | 30,000 |  |  |  |  | 20,000 |  | 5,000 |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] | Underwriters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New issuance of shares |  |  |  |  |  | 18,000 |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] | Forward Purchasers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New issuance of shares |  |  |  |  |  | 12,000 |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Empire City [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  |  |  | 13,000 |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Park MGM [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Operating Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership interest |  |  | 56.70% | 60.30% | 61.20% | 63.70% | 69.80% | 74.60% | 60.60% | 68.80% | 69.70% | 53.00% | 67.60% |  |
Operating partnership units, redeemed |  | 24,000 | 30,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  | $ 700,000,000 | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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