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Basis of Presentation and Significant Accounting Policies - 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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net income (loss) attributable to MGM Resorts International $ (1,032,724) $ 2,049,146 $ 466,772
Adjustment related to redeemable noncontrolling interests 35,520 (2,713) (21,326)
Net income (loss) available to common stockholders - basic (997,204) 2,046,433 445,446
Other 0 (194) (206)
Net income (loss) attributable to common stockholders - diluted $ (997,204) $ 2,046,239 $ 445,240
Denominator:      
Weighted average common shares outstanding basic 494,152 524,173 544,253
Potential dilution from share-based awards 0 3,472 5,283
Weighted average common and common equivalent shares - diluted 494,152 527,645 549,536
Antidilutive share-based awards excluded from the calculation of diluted earnings per share 9,493 1,617 2,668