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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |
Tax cuts and jobs act of 2017, measurement period adjustment, income tax expense (benefit) |  |  | $ 20,000 |
Measurement period adjustment, effective tax rate increased |  |  | 3.00% |
Deferred Taxes for annual fee |  |  | $ 41 |
Macau [Member] | MGM Grand Paradise SA [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Macau's complementary tax rate on distributions of gaming profits (as a percent) |  | 12.00% |  |
Decrease in net income attributable to MGM Resorts International |  | $ (54,000) | $ (43,000) |
Per share decrease in net income attributable to MGM Resorts International |  | $ (0.10) | $ (0.08) |
Increase in deferred tax liabilities |  | $ 35,000 |  |
Complementary tax |  | 1,150,000 |  |
Annual payments required under the extended annual fee arrangement |  | $ 1,000 | $ 1,000 | $ 1,000
Macau [Member] | MGM Grand Paradise SA [Member] | Forecast [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Payments required under the extended annual fee arrangement | $ 300 |  |  |

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