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Stockholders' Equity - Summary of Net Income Attributable to and Transfers from Noncontrolling Interest, Which Shows Effects of Changes in Company's Ownership Interest in a Subsidiary (Detail) - USD ($) $ 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
Stockholders Equity Note [Line Items]
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
Transfers from/(to) noncontrolling interest:
Other									(935)	(5,667)	(2,889)
Net transfers from/(to) noncontrolling interest									152,034	(5,667)	19,752
Change from net income attributable to MGM Resorts International and transfers to noncontrolling interest									2,201,180	461,105	1,971,804
Empire City [Member]
Transfers from/(to) noncontrolling interest:
Net transfers from/(to) noncontrolling interest									(18,718)	0	0
Park MGM [Member]
Transfers from/(to) noncontrolling interest:
Net transfers from/(to) noncontrolling interest									(1,968)	0	0
Northfield OpCo [Member]
Transfers from/(to) noncontrolling interest:
Net transfers from/(to) noncontrolling interest									21,679	0	0
MGM Growth Properties LLC [Member] | Class A shares [Member]
Transfers from/(to) noncontrolling interest:
MGP Class A share issuances									151,976	0	35,138
MGM National Harbor Transaction [Member]
Transfers from/(to) noncontrolling interest:
Net transfers from/(to) noncontrolling interest									$ 0	$ 0	$ (12,497)

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