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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income (loss) attributable to MGM Resorts International	$ (37,133)	$ 142,878	$ 37,569	$ 490,099
Adjustment related to redeemable noncontrolling interests	(3,074)	(4,155)	(5,906)	(14,739)
Net income (loss) available to common stockholders - basic	(40,207)	138,723	31,663	475,360
Potentially dilutive effect due to MGP and MGM China stock compensation plans	(30)	(43)	(111)	(179)
Net income (loss) attributable to common stockholders - diluted	$ (40,237)	$ 138,680	$ 31,552	$ 475,181
Denominator:
Weighted-average common shares outstanding - basic	518,983	535,130	528,429	549,418
Potential dilution from share-based awards	0	5,266	3,444	6,103
Weighted-average common and common equivalent shares - diluted	518,983	540,396	531,873	555,521
Antidilutive share-based awards excluded from the calculation of diluted earnings per share	1,108	2,432	1,816	1,681

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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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