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Income Per Share of Common Stock - Schedule of Diluted Weighted-Average Number of Common and Common Equivalent Shares Adjustments for Potential Dilution of Share-Based Awards Outstanding (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net income (loss) attributable to MGM Resorts International $ (534,731) $ (37,133) $ (585,119) $ 37,569
Adjustment related to redeemable noncontrolling interests 1,777 (3,074) 42,028 (5,906)
Net income (loss) available to common stockholders - basic (532,954) (40,207) (543,091) 31,663
Potentially dilutive effect due to MGP and MGM China stock compensation plans (25) (30) (21) (111)
Net income (loss) attributable to common stockholders - diluted $ (532,979) $ (40,237) $ (543,112) $ 31,552
Denominator:        
Weighted-average common shares outstanding - basic 493,517 518,983 494,126 528,429
Potential dilution from share-based awards 0 0 0 3,444
Weighted-average common and common equivalent shares - diluted 493,517 518,983 494,126 531,873
Antidilutive share-based awards excluded from the calculation of diluted earnings per share 6,183 1,108 5,143 1,816