Income Per Share of Common Stock - Schedule of Weighted-Average Number of Common and Common Equivalent Shares Used in the Calculation of Basic and Diluted Income Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income attributable to MGM Resorts International	$ 149,115	$ 535,619	$ 566,573	$ 1,076,771
Adjustment related to redeemable noncontrolling interests	(28)	0	(83)	0
Net income available to common stockholders - basic	149,087	535,619	566,490	1,076,771
Net income attributable to common stockholders - diluted	$ 149,045	$ 535,604	$ 566,315	$ 1,076,753
Denominator:
Weighted-average common shares outstanding - basic	573,527	568,125	574,262	566,220
Potential dilution from share-based awards	7,149	5,687	6,679	5,130
Weighted-average common and common equivalent shares - diluted	580,676	573,812	580,941	571,350
Antidilutive share-based awards excluded from the calculation of diluted earnings per share	1,989	3,362	2,424	4,314
MGP Omnibus Plan [Member]
Numerator:
Potentially dilutive effect due to plan	$ (20)	$ (15)	$ (79)	$ (18)
MGM China Plan [Member]
Numerator:
Potentially dilutive effect due to plan	$ (22)	$ 0	$ (96)	$ 0