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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
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income attributable to MGM Resorts International	$ 806,869	$ 31,297
Adjustment related to redeemable noncontrolling interests	8,070	(3,825)
Net income available to common stockholders - basic	814,939	27,472
Potentially dilutive effect due to MGP and MGM China stock compensation plans	0	(52)
Net income attributable to common stockholders - diluted	$ 814,939	$ 27,420
Denominator:
Weighted-average common shares outstanding - basic	495,415	534,219
Potential dilution from share-based awards	1,569	3,287
Weighted-average common and common equivalent shares - diluted	496,984	537,506
Antidilutive share-based awards excluded from the calculation of diluted earnings per share	3,876	1,929

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