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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Disclosure [Line Items] |  |  |  |
Effective income tax rate | (11.30%) | (620.80%) | (8.90%) | 33.90%
Income tax expense (benefit) | $ (76,734,000) | $ (7,276,000) | $ (84,668,000) | $ 75,969,000
MGM Grand Paradise SA [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Complementary tax rate on distributions of gaming profits (as a percent) |  |  | 12.00% |
Accrued amount | 0 |  | $ 0 |
Macau [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Increase in tax credit carry forward valuation allowance |  |  | 25,000,000 |
Increase in foreign tax credit carry forward valuation allowance | $ 1,000,000 |  | 28,000,000 |
Income tax expense (benefit) |  |  | $ (6,000,000) |
Special gaming tax rate |  |  | 35.00% |
Macau [Member] | MGM Grand Paradise SA [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Complementary tax rate on distributions of gaming profits (as a percent) |  |  | 12.00% |
Macau [Member] | MGP BREIT Venture [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Income tax expense (benefit) |  |  | $ 349,000,000 |

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