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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