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Organization - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Dec. 02, 2020 USD ($) $ / shares shares | May 18, 2020 USD ($) $ / shares shares | Feb. 14, 2020 USD ($) shares | Feb. 13, 2020 shares | Nov. 22, 2019 shares | Nov. 15, 2019 USD ($) | Feb. 29, 2020 shares | Jan. 31, 2019 shares | Dec. 31, 2020 USD ($) Property Segment | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Sep. 01, 2016 shares
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate assets |  |  |  |  |  |  |  |  | $ 1,491,945 | $ 2,677,996 | $ 0 |
Assumption of debt |  |  |  |  |  |  |  |  | 12,480,586 | 11,271,706 |  |
Payment for purchase of common shares |  |  |  |  |  |  |  |  | 353,720 | $ 1,031,534 | $ 1,283,333 |
Operating partnership units, redeemed | shares | 24.0 | 30.0 |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption | $ 700,000 | $ 700,000 |  |  |  |  |  |  | $ 22,292 |  |  |
Operating partnership redemption per unit | $ / shares | $ 29.78 | $ 23.10 |  |  |  |  |  |  |  |  |  |
Number of integrated casino | Property |  |  |  |  |  |  |  |  | 2 |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  | 3 |  |  |
CityCenter Holdings LLC As Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |
BetMGM LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest |  |  |  |  |  |  |  |  | 50.00% |  |  |
Infinity World Development Corp [Member] | CityCenter Holdings LLC As Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest |  |  |  |  |  |  |  |  | 50.00% |  |  |
Entain [Member] | BetMGM LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest |  |  |  |  |  |  |  |  | 50.00% |  |  |
Hard Rock Rocksino Northfield Park [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition agreement |  |  |  |  |  |  |  |  | 2018-07 |  |  |
Bellagio B R E I T Venture |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of minority interest |  |  |  |  |  |  |  |  | 5.00% |  |  |
MGP BREIT Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Partnership interest |  |  |  |  |  |  |  |  | 50.10% |  |  |
Percentage of minority interest |  |  |  |  |  |  |  |  | 49.90% |  |  |
Total consideration received from sale of real estate assets |  |  | $ 4,600,000 |  |  |  |  |  |  |  |  |
Cash received from sale of real estate assets |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |
Guarantee obligation amount |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |
Operating partnership equity interest |  |  | 50.10% |  |  |  |  |  |  |  |  |
Issuance of operating partnership units | shares |  |  | 3.0 |  |  |  | 3.0 |  |  |  |  |
Percentage of issuance of operating partnership units to equity value of consolidated subsidiary |  |  | 5.00% |  |  |  |  |  |  |  |  |
Reduction in lease annual rent due to modification |  |  | $ 133,000 |  |  |  |  |  |  |  |  |
MGP BREIT Venture [Member] | Term Loan B [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |
Blackstone Real Estate Income Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  | 5.00% |  |  |  |  |  |
Total consideration received from sale of real estate assets |  |  |  |  |  | $ 4,250,000 |  |  |  |  |  |
Cash received from sale of real estate assets |  |  |  |  |  | 4,200,000 |  |  |  |  |  |
Gain on sale of real estate assets |  |  |  |  |  | 2,700,000 |  |  |  |  |  |
Guarantee obligation amount |  |  |  |  |  | $ 3,010,000 |  |  | $ 3,010,000 |  |  |
Blackstone Real Estate Income Trust [Member] | Class A Shareholders [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares acquired | shares |  |  | 5.0 |  |  |  |  |  |  |  |  |
Payment for purchase of common shares |  |  | $ 150,000 |  |  |  |  |  |  |  |  |
MGM Grand Las Vegas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consideration received from sale of real estate assets |  |  | 2,500,000 |  |  |  |  |  |  |  |  |
Gain on sale of real estate assets |  |  | 1,700,000 |  |  |  |  |  |  |  |  |
Carrying value of real estate assets |  |  | 733,000 |  |  |  |  |  |  |  |  |
Selling Cost Of Real Estate |  |  | 27,000 |  |  |  |  |  |  |  |  |
Mandalay Bay [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consideration received from sale of real estate assets |  |  | 2,100,000 |  |  |  |  |  |  |  |  |
Gain on sale of real estate assets |  |  | (252,000) |  |  |  |  |  |  |  |  |
Carrying value of real estate assets |  |  | 2,300,000 |  |  |  |  |  |  |  |  |
Selling Cost Of Real Estate |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Subsidiary Of Blackstone Real Estate Income Trust | Bellagio B R E I T Venture |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  | 95.00% |  |  |
Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock voting rights |  |  |  |  |  |  |  |  | one vote per share |  |  |
Non-Guarantor MGP Subsidiaries [Member] | Class B shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock voting rights |  |  |  |  |  |  |  |  | Class B share, is entitled to an amount of votes representing a majority of the total voting power of MGP’s shares so long as the Company and its controlled affiliates’ (excluding MGP) aggregate beneficial ownership of the combined economic interests in MGP and the Operating Partnership does not fall below 30%. |  |  |
MGM Growth Properties LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum ownership percentage required for majority voting interest |  |  |  |  |  |  |  |  | 30.00% |  |  |
Partnership interest |  |  |  |  |  |  |  |  | 53.00% |  |  |
Percentage of minority interest |  |  |  |  |  |  |  |  | 47.00% |  |  |
Redemptions discount percentage |  |  | 3.00% |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  |  | $ 1,400,000 |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units | shares |  |  | 5.0 | 13.0 | 18.0 |  |  | 20.0 |  | 5.0 |  |
MGM China [Member] |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares acquired | shares |  |  |  |  |  |  |  |  |  |  |  | 188.1
Percentage ownership interest |  |  |  |  |  |  |  |  | 56.00% |  |  |

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