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Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues
Revenues	$ 2,252,817	$ 3,176,911
Other operating income (expense)
Preopening and start-up expenses	(122)	(3,287)
Property transactions, net	(54,975)	(8,776)
Gain on REIT transactions, net	1,491,945	0
Depreciation and amortization	(318,290)	(316,414)
Restructuring	0	(41,098)
Triple net operating lease and ground lease rent expense	(141,918)	(7,893)
Income from unconsolidated affiliates related to investments in REITs	23,514	0
Operating income	1,250,845	370,260
Non-operating income (expense)
Interest expense, net of amounts capitalized	(157,137)	(216,120)
Non-operating items from unconsolidated affiliates	(32,621)	(18,165)
Other, net	(124,264)	1,693
Total non-operating income (expense)	(314,022)	(232,592)
Income before income taxes	936,823	137,668
Provision for income taxes	(262,304)	(71,511)
Net income	674,519	66,157
Less: Net (income) loss attributable to noncontrolling interests	132,350	(34,860)
Net income attributable to MGM Resorts International	806,869	31,297
Chief Executive Officer [Member]
Other operating income (expense)
CEO transition expense	44,401	0
Reportable segments [Member]
Revenues
Revenues	2,131,353	2,966,337
Adjusted Property EBITDAR	397,329	808,259
Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	1,133,806	1,428,188
Adjusted Property EBITDAR	267,599	403,651
Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	725,660	803,945
Adjusted Property EBITDAR	151,720	211,797
Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	271,887	734,204
Adjusted Property EBITDAR	(21,990)	192,811
Corporate and other [Member]
Revenues
Revenues	121,464	210,574
Other operating income (expense)
Corporate and other	(102,237)	(60,531)
Casino [Member]
Revenues
Revenues	1,054,026	1,626,346
Casino [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	274,673	324,704
Casino [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	536,630	574,156
Casino [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	240,414	663,565
Rooms [Member]
Revenues
Revenues	433,951	574,215
Rooms [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	362,864	468,852
Rooms [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	55,879	71,798
Rooms [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	15,209	33,564
Food and Beverage [Member]
Revenues
Revenues	396,709	520,221
Food and Beverage [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	288,763	365,522
Food and Beverage [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	95,092	117,879
Food and Beverage [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	12,780	30,713
Entertainment, Retail and Other [Member]
Revenues
Revenues	269,945	344,374
Entertainment, Retail and Other [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	207,506	269,110
Entertainment, Retail and Other [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	38,059	40,112
Entertainment, Retail and Other [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	$ 3,484	$ 6,362

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