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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Net income attributable to MGM Resorts International $ 142,878 $ 148,363 $ 490,099 $ 564,639
Adjustment related to redeemable noncontrolling interests (4,155) (28) (14,739) (83)
Net income available to common stockholders - basic 138,723 148,335 475,360 564,556
Potentially dilutive effect due to MGP and MGM China stock compensation plans (43) (42) (179) (175)
Net income attributable to common stockholders - diluted $ 138,680 $ 148,293 $ 475,181 $ 564,381
Denominator:        
Weighted-average common shares outstanding - basic 535,130 573,527 549,418 574,262
Potential dilution from share-based awards 5,266 7,149 6,103 6,679
Weighted-average common and common equivalent shares - diluted 540,396 580,676 555,521 580,941
Antidilutive share-based awards excluded from the calculation of diluted earnings per share 2,432 1,989 1,681 2,424