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Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Revenues	$ 2,267,962	$ 289,809	$ 3,915,709	$ 2,542,626
Other operating income (expense)
Preopening and start-up expenses	(90)	82	(95)	(40)
Property transactions, net	28,906	(26,349)	2,835	(81,324)
Gain on REIT transactions, net	0	0	0	1,491,945
Depreciation and amortization	(283,625)	(299,206)	(574,176)	(617,496)
October 1 litigation settlement	0	(49,000)	0	(49,000)
Restructuring	0	(19,882)	0	(19,882)
Triple-net operating lease and ground lease rent expense	(189,609)	(189,567)	(379,229)	(331,485)
Gain related to sale of Harmon land - unconsolidated affiliate	49,755	0	49,755	0
Income from unconsolidated affiliates related to real estate ventures	41,666	41,555	83,338	65,069
Operating income (loss)	263,760	(1,034,529)	17,070	216,316
Non-operating income (expense)
Interest expense, net of amounts capitalized	(202,772)	(156,756)	(398,067)	(313,893)
Non-operating items from unconsolidated affiliates	(23,216)	(23,761)	(44,052)	(56,382)
Other, net	87,358	8,321	119,543	(115,943)
Total non-operating income (expense)	(138,630)	(172,196)	(322,576)	(486,218)
Income (loss) before income taxes	125,130	(1,206,725)	(305,506)	(269,902)
Benefit (provision) for income taxes	(34,826)	270,238	59,872	7,934
Net income (loss)	90,304	(936,487)	(245,634)	(261,968)
Less: Net loss attributable to noncontrolling interests	14,449	79,230	18,558	211,580
Net income (loss) attributable to MGM Resorts International	104,753	(857,257)	(227,076)	(50,388)
Chief Executive Officer [Member]
Other operating income (expense)
CEO transition expense	0	0	0	(44,401)
Reportable segments [Member]
Revenues
Revenues	2,171,481	273,273	3,724,150	2,404,626
Adjusted Property EBITDAR	723,734	(332,820)	1,078,610	64,509
Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	1,004,568	150,811	1,549,532	1,284,617
Adjusted Property EBITDAR	396,805	(104,447)	504,924	163,152
Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	856,282	89,264	1,567,633	814,924
Adjusted Property EBITDAR	318,348	(112,085)	560,330	39,635
Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	310,631	33,198	606,985	305,085
Adjusted Property EBITDAR	8,581	(116,288)	13,356	(138,278)
Corporate and other [Member]
Revenues
Revenues	96,481	16,536	191,559	138,000
Other operating income (expense)
Corporate and other, net	(106,977)	(159,342)	(243,968)	(261,579)
Casino [Member]
Revenues
Revenues	1,336,124	163,649	2,434,757	1,217,675
Casino [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	353,473	63,028	585,567	337,701
Casino [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	707,864	77,177	1,304,519	613,807
Casino [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	270,935	23,284	532,539	263,698
Rooms [Member]
Revenues
Revenues	365,028	31,623	563,447	465,574
Rooms [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	298,714	26,105	443,043	388,969
Rooms [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	48,924	4,181	89,503	60,060
Rooms [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	17,389	1,335	30,902	16,544
Food and Beverage [Member]
Revenues
Revenues	302,666	29,771	460,078	426,480
Food and Beverage [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	215,631	21,026	306,050	309,789
Food and Beverage [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	69,149	4,314	119,513	99,406
Food and Beverage [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	17,886	4,431	34,515	17,211
Entertainment, Retail and Other [Member]
Revenues
Revenues	189,011	48,569	324,233	318,514
Entertainment, Retail and Other [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	136,750	40,652	214,872	248,158
Entertainment, Retail and Other [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	30,345	3,592	54,098	41,651
Entertainment, Retail and Other [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	$ 4,421	$ 4,148	$ 9,029	$ 7,632

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