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Income Per Share of Common Stock - Schedule of Weighted-Average Number of Common and Common Equivalent Shares Used in the Calculation of Basic and Diluted Income Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator:    
Net income attributable to MGM Resorts International $ 206,847 $ 66,799
Adjustment related to redeemable noncontrolling interests (28) 0
Net income available to common stockholders - basic 206,819 66,799
Net income attributable to common stockholders - diluted $ 206,763 $ 66,799
Denominator:    
Weighted-average common shares outstanding - basic 574,403 565,056
Potential dilution from share-based awards 5,762 4,399
Weighted-average common and common equivalent shares - diluted 580,165 569,455
Antidilutive share-based awards excluded from the calculation of diluted earnings per share 3,205 6,456
MGP Omnibus Plan [Member]    
Numerator:    
Potentially dilutive effect due to plan $ (37) $ 0
MGM China Plan [Member]    
Numerator:    
Potentially dilutive effect due to plan $ (19) $ 0