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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 13, 2020 | Feb. 12, 2020 | Jan. 01, 2020 | Nov. 22, 2019 | Oct. 15, 2017 | Sep. 11, 2017 | Apr. 30, 2019 | Mar. 31, 2019 | Jan. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2018 | Sep. 30, 2017
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Gross |  |  |  |  |  |  |  |  |  | $ 11,271,706,000 | $ 15,253,239,000 |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ 1,031,534,000 | $ 1,283,333,000 | $ 327,500,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date |  | Feb. 12, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share |  | $ 0.15 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid date |  | Mar. 16, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  | Mar. 10, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  |  |  |  |  |  |  |  | 35,854 | 41,076 | 10,000 |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ 358,000 | $ 411,000 | $ 100,000 |  |
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase |  |  |  |  |  |  |  |  |  | 2,000,000,000.0 |  |  | $ 2,000,000,000.0 |
Repurchase of common stock, remaining amount |  |  |  |  |  |  |  |  |  | $ 357,000,000 |  |  |  |
Share Repurchase Program Two [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0
Share Repurchase Program Three [Member] | Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase |  | $ 3,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tender offer expiration date |  |  |  |  |  |  |  |  |  | Mar. 12, 2020 |  |  |  |
Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  |  |  |  |  |  |  |  | 36,000 | 41,000 |  |  |
Stock repurchased, average price per share |  |  |  |  |  |  |  |  |  | $ 28.77 | $ 31.25 |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 | $ 1,300,000,000 |  |  |
Share Repurchase Program [Member] | Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases, Shares |  |  | 11,000 |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, average price per share |  |  | $ 32.57 |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  | $ 354,000,000 |  |  |  |  |  |  |  |  |  |  |
Tender offer | $ 1,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program [Member] | Common Stock [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, average price per share | $ 34 |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program [Member] | Common Stock [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, average price per share | $ 29 |  |  |  |  |  |  |  |  |  |  |  |  |
Northfield OpCo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  |  |  | 9,000 |  |  |  |  |  |  |
MGM National Harbor Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units |  |  |  |  | 9,800 |  |  |  |  |  |  |  |  |
Cash in exchange |  |  |  |  | $ 463,000,000 |  |  |  |  |  |  |  |  |
Term Loan [Member] | MGM National Harbor Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, Gross |  |  |  |  | $ 425,000,000 |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership interest |  |  |  |  | 73.40% | 72.30% | 68.80% | 69.80% | 74.60% | 63.70% |  |  |  |
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 |  |  |  |  |  |
Class A shares [Member] | MGM Growth Properties LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New issuance of shares |  |  |  | 30,000 |  | 13,200 |  |  | 20,000 | 5,000 |  |  |  |
Issuance of operating partnership units |  |  |  | 18,000 |  | 13,200 |  |  | 20,000 | 5,000 |  |  |  |
Partnership interest |  |  |  | 63.70% |  |  |  |  | 69.70% | 63.70% |  |  |  |
Class A shares [Member] | MGM Growth Properties LLC [Member] | Underwriters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New issuance of shares |  |  |  | 18,000 |  |  |  |  |  |  |  |  |  |
Class A shares [Member] | MGM Growth Properties LLC [Member] | Forward Purchasers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
New issuance of shares |  |  |  | 12,000 |  |  |  |  |  |  |  |  |  |

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