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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. 07, 2019 | Jul. 26, 2019 | Jun. 30, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Jan. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | May 31, 2018 | Sep. 30, 2017
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, value |  |  |  |  |  |  | $ 281,833,000 | $ 594,864,000 | $ 362,400,000 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  |  |  |  |  | 11,005 | 19,004 | 10,000 |  |  |  |
Common stock repurchases, value |  |  |  |  |  |  | $ 110,000 | $ 190,000 | $ 100,000 |  |  |  |
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000.0 |
Repurchase of common stock, remaining amount |  |  | $ 1,100,000,000 |  |  |  | $ 1,100,000,000 |  |  | $ 1,100,000,000 |  |  |
Share Repurchase Program Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  |  |  |  |  | 11,000 | 19,000 |  | 11,000 | 29,000 |  |
Average price per share |  |  |  |  |  |  | $ 25.61 | $ 31.30 |  | $ 25.61 | $ 33.00 |  |
Common stock repurchases, value |  |  |  |  |  |  | $ 282,000,000 | $ 595,000,000 |  | $ 282,000,000 | $ 957,000,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  | Jul. 25, 2019 |  |  |  |  |  |  |  |  |  |  |
Dividend paid date |  | Sep. 16, 2019 |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  | Sep. 10, 2019 |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share |  | $ 0.13 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares | 6,000 |  |  |  |  |  |  |  |  |  |  |  |
Average price per share | $ 28.86 |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, value | $ 173,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  | 20,000 |  |  |  |  |  |  |
Partnership interest |  |  |  |  |  | 69.70% |  |  |  |  |  |  |
New issuance of shares |  |  |  |  |  | 20,000 |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  | 9,000 | 1,000 |  |  |  |  |  |  |  |
Partnership interest |  |  | 68.30% | 68.80% | 69.80% | 74.60% |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  |  | 2,000 |  |  |  |  |  |
Partnership interest |  |  |  |  |  |  | 68.30% |  |  |  |  |  |
New issuance of shares |  |  |  |  |  |  | 2,000 |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Empire City [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  | 13,000 |  |  |  |  |  |  |

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