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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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income (loss) attributable to MGM Resorts International	$ (857,257)	$ 43,405	$ (50,388)	$ 74,702
Adjustment related to redeemable noncontrolling interests	32,182	992	40,251	(2,832)
Net income (loss) available to common stockholders - basic	(825,075)	44,397	(10,137)	71,870
Potentially dilutive effect due to MGP and MGM China stock compensation plans	(20)	(35)	0	(86)
Net income (loss) attributable to common stockholders - diluted	$ (825,095)	$ 44,362	$ (10,137)	$ 71,784
Denominator:
Weighted-average common shares outstanding - basic	493,456	532,365	494,434	533,286
Potential dilution from share-based awards	0	3,052	0	3,170
Weighted-average common and common equivalent shares - diluted	493,456	535,417	494,434	536,456
Antidilutive share-based awards excluded from the calculation of diluted earnings per share	5,370	2,411	4,623	2,170

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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