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Organization - Additional Information (Detail) shares in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2020 USD ($) shares | Jan. 14, 2020 USD ($) | Nov. 22, 2019 shares | Nov. 15, 2019 USD ($) | Oct. 15, 2017 | Sep. 11, 2017 shares | Apr. 30, 2019 | Mar. 31, 2019 | Jan. 31, 2019 shares | Mar. 31, 2019 | Dec. 31, 2019 USD ($) Segment shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Aug. 31, 2018 | Sep. 01, 2016 shares
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from sale of real estate assets |  |  |  |  |  |  |  |  |  |  | $ 4,151,499,000 | $ 0 | $ 0 |  |
Gain on sale of real estate assets |  |  |  |  |  |  |  |  |  |  | 2,677,996,000 | 0 | 0 |  |
Assumption of debt |  |  |  |  |  |  |  |  |  |  | 11,271,706,000 | 15,253,239,000 |  |  |
Payment for purchase of common shares |  |  |  |  |  |  |  |  |  |  | $ 1,031,534,000 | 1,283,333,000 | $ 327,500,000 |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Hard Rock Rocksino Northfield Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition agreement |  |  |  |  |  |  |  |  |  |  | 2018-07 |  |  |  |
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 |  |  |  |  | 73.40% | 72.30% | 68.80% | 69.80% | 74.60% |  | 63.70% |  |  |  |
Percentage of minority interest |  |  |  |  |  |  |  |  |  |  | 36.30% |  |  |  |
MGM Growth Properties LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units redemption period | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemptions discount percentage |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Waiver termination period |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds for redemption | $ 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership interest |  |  | 63.70% |  |  |  |  |  | 69.70% |  | 63.70% |  |  |  |
Issuance of operating partnership units | shares |  |  | 18.0 |  |  | 13.2 |  |  | 20.0 |  | 5.0 |  |  |  |
MGM China [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares acquired | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 188.1
Percentage ownership interest |  |  |  |  |  |  |  |  |  | 56.00% |  |  |  |  |
Grand Victoria [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Total consideration received from sale of real estate assets |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |  |  |
CityCenter Holdings LLC As Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |
Infinity World Development Corp [Member] | CityCenter Holdings LLC As Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Blackstone Real Estate Income Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration received from sale of real estate assets |  |  |  | $ 4,250,000,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in joint venture |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Cash received from sale of real estate assets |  |  |  | $ 4,200,000,000 |  |  |  |  |  |  |  |  |  |  |
Gain on sale of real estate assets |  |  |  | 2,700,000,000 |  |  |  |  |  |  |  |  |  |  |
Guarantee obligation amount |  |  |  | $ 3,010,000,000.00 |  |  |  |  |  |  | $ 3,010,000,000.00 |  |  |  |
Blackstone Real Estate Income Trust [Member] | Subsequent Event [Member] | Class A Shareholders [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares acquired | shares | 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for purchase of common shares | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MGP BREIT Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee obligation amount |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000.0 |  |  |  |
MGP BREIT Venture [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership interest | 50.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of minority interest | 49.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration received from sale of real estate assets | $ 4,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from sale of real estate assets | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating partnership equity interest | 50.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units | shares | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of issuance of operating partnership units to equity value of consolidated subsidiary | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial annual rent | $ 292,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, renewal term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rent escalator from year one through year Fifteen | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rent escalator after year fifteen | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rent escalator cap after year fifteen | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage net revenue for lease | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease restriction or covenant | Company to comply with certain financial covenants, which, if not met, will require the Company to maintain cash security or provide one or more letters of credit in favor of the landlord in an amount equal to the rent for the succeeding one-year period. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in lease annual rent due to modification | $ 133,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MGP BREIT Venture [Member] | Subsequent Event [Member] | Term Loan B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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