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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, 2019	Mar. 31, 2018
Numerator:
Net income attributable to MGM Resorts International	$ 31,297	$ 223,444
Adjustment related to redeemable noncontrolling interests	(3,825)	(4,598)
Net income available to common stockholders - basic	27,472	218,846
Potentially dilutive effect due to MGP and MGM China stock compensation plans	(52)	(165)
Net income attributable to common stockholders - diluted	$ 27,420	$ 218,681
Denominator:
Weighted-average common shares outstanding - basic	534,219	564,832
Potential dilution from share-based awards	3,287	7,138
Weighted-average common and common equivalent shares - diluted	537,506	571,970
Antidilutive share-based awards excluded from the calculation of diluted earnings per share	1,929	170

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