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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income attributable to MGM Resorts International	$ 43,405	$ 123,777	$ 74,702	$ 347,221
Adjustment related to redeemable noncontrolling interests	992	(5,986)	(2,832)	(10,584)
Net income available to common stockholders - basic	44,397	117,791	71,870	336,637
Potentially dilutive effect due to MGP and MGM China stock compensation plans	(35)	(26)	(86)	(158)
Net income attributable to common stockholders - diluted	$ 44,362	$ 117,765	$ 71,784	$ 336,479
Denominator:
Weighted-average common shares outstanding - basic	532,365	548,433	533,286	556,586
Potential dilution from share-based awards	3,052	5,906	3,170	6,522
Weighted-average common and common equivalent shares - diluted	535,417	554,339	536,456	563,108
Antidilutive share-based awards excluded from the calculation of diluted earnings per share	2,411	2,441	2,170	1,305

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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