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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 |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 30, 2020 | May 18, 2020 | Feb. 14, 2020 | Feb. 13, 2020 | Mar. 07, 2019 | Feb. 29, 2020 | Apr. 30, 2019 | Jan. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | May 31, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  |  |  |  |  |  |  |  | $ 3,205,000 |  | $ 3,205,000 |  |
Common stock repurchases, value |  |  |  |  |  |  |  |  |  | $ 281,833,000 | 353,720,000 | $ 281,833,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  |  |  |  |  |  |  |  | 0 |  | $ 0 |  |
Common stock repurchases, Shares |  |  |  |  |  |  |  |  |  | 11,005 | 10,861 | 11,005 |
Common stock repurchases, value |  |  |  |  |  |  |  |  |  | $ 110,000 | $ 109,000 | $ 110,000 |
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 |  |  |  |  |  |  |  |  | 0 | 11,000 | 11,000 | 11,000 |
Stock repurchased, average price per share |  |  |  |  |  |  |  |  |  | $ 25.61 | $ 32.57 | $ 25.61 |
Common stock repurchases, value |  |  |  |  |  |  |  |  |  | $ 282,000,000 | $ 354,000,000 | $ 282,000,000 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share | $ 0.0025 |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid date | Sep. 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date | Sep. 10, 2020 |  |  |  |  |  |  |  |  |  |  |  |
MGP BREIT Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  | 3,000 |  |  | 3,000 |  |  |  |  |  |  |
Northfield Operating Company |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  |  | 9,000 |  |  |  |  |  |
MGM Growth Properties LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating partnership units, redeemed |  | 30,000 |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  | 5,000 | 13,000 |  |  |  | 20,000 |  | 2,000 |  |  |
New issuance of shares |  |  | 5,000 |  |  |  |  | 20,000 |  | 2,000 |  |  |
Number of forward shares settled |  |  |  | 13,000 |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Operating Partnership |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership interest |  |  | 60.30% | 61.20% | 69.80% | 60.60% | 68.80% | 74.60% | 56.70% |  | 56.70% |  |
Operating partnership units, redeemed |  | 30,000 |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | MGP [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership interest |  |  |  |  |  |  |  | 69.70% |  | 68.30% |  | 68.30% |
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 |  |  |  |  |  |  |  |

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