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Basis of Presentation and Significant Accounting Policies - 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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income attributable to MGM Resorts International	$ 2,011,577	$ (37,133)	$ 43,405	$ 31,297	$ (23,327)	$ 142,878	$ 123,777	$ 223,444	$ 2,049,146	$ 466,772	$ 1,952,052
Adjustment related to redeemable noncontrolling interests									(2,713)	(21,326)	(18,363)
Net income available to common stockholders - basic									2,046,433	445,446	1,933,689
Potentially dilutive effect due to MGP and MGM China stock compensation plans									(194)	(206)	(268)
Net income attributable to common stockholders - diluted									$ 2,046,239	$ 445,240	$ 1,933,421
Denominator:
Weighted-average common shares outstanding basic									524,173	544,253	572,253
Potential dilution from share-based awards									3,472	5,283	6,542
Weighted-average common and common equivalent shares - diluted									527,645	549,536	578,795
Antidilutive share-based awards excluded from the calculation of diluted earnings per share									1,617	2,668	2,601

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