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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income (loss) attributable to MGM Resorts International $ 1,350,433 $ (534,731) $ 1,123,357 $ (585,119)
Adjustment related to redeemable noncontrolling interests (7,580) 1,777 (54,019) 42,028
Net income (loss) available to common stockholders – basic 1,342,853 (532,954) 1,069,338 (543,091)
Other 0 (25) 0 (21)
Net income (loss) attributable to common stockholders - diluted $ 1,342,853 $ (532,979) $ 1,069,338 $ (543,112)
Denominator:        
Weighted-average common shares outstanding – basic (in shares) 478,405 493,517 487,509 494,126
Potential dilution from share-based awards (in shares) 5,810 0 5,675 0
Weighted-average common and common equivalent shares – diluted (in shares) 484,215 493,517 493,184 494,126
Antidilutive share-based awards excluded from the calculation of diluted earnings per share (in shares) 77 6,183 32 5,143