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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:      
Net income (loss) attributable to MGM Resorts International $ 1,254,370 $ (1,032,724) $ 2,049,146
Adjustment related to redeemable noncontrolling interests (78,298) 35,520 (2,713)
Net income (loss) available to common stockholders - basic 1,176,072 (997,204) 2,046,433
Other 0 0 (194)
Net income (loss) attributable to common stockholders - diluted $ 1,176,072 $ (997,204) $ 2,046,239
Denominator:      
Weighted average common shares outstanding basic 481,930 494,152 524,173
Potential dilution from share-based awards 5,426 0 3,472
Weighted average common and common equivalent shares - diluted 487,356 494,152 527,645
Antidilutive share-based awards excluded from the calculation of diluted earnings per share 198 9,493 1,617