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Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Revenues	$ 289,809	$ 3,223,243	$ 2,542,626	$ 6,400,154
Other operating income (expense)
Preopening and start-up expenses	82	(879)	(40)	(4,166)
Property transactions, net	(26,349)	(5,790)	(81,324)	(14,566)
Gain on REIT transactions, net	0	0	1,491,945	0
Depreciation and amortization	(299,206)	(334,788)	(617,496)	(651,202)
October 1 litigation settlement	(49,000)	0	(49,000)	0
Restructuring	(19,882)	(42,990)	(19,882)	(84,088)
Triple-net operating lease and ground lease rent expense	(189,567)	(8,392)	(331,485)	(16,285)
Income from unconsolidated affiliates related to real estate ventures	41,555	0	65,069	0
Operating income (loss)	(1,034,529)	371,485	216,316	741,745
Non-operating income (expense)
Interest expense, net of amounts capitalized	(156,756)	(215,829)	(313,893)	(431,949)
Non-operating items from unconsolidated affiliates	(23,761)	(21,477)	(56,382)	(39,642)
Other, net	8,321	(46,276)	(115,943)	(44,583)
Total non-operating income (expense)	(172,196)	(283,582)	(486,218)	(516,174)
Income (loss) before income taxes	(1,206,725)	87,903	(269,902)	225,571
Benefit (provision) for income taxes	270,238	(11,734)	7,934	(83,245)
Net income (loss)	(936,487)	76,169	(261,968)	142,326
Less: Net (income) loss attributable to noncontrolling interests	79,230	(32,764)	211,580	(67,624)
Net income (loss) attributable to MGM Resorts International	(857,257)	43,405	(50,388)	74,702
Chief Executive Officer [Member]
Other operating income (expense)
CEO transition expense	0	0	(44,401)	0
Reportable segments [Member]
Revenues
Revenues	273,273	3,083,386	2,404,626	6,049,723
Adjusted Property EBITDAR	(332,820)	851,930	64,509	1,660,189
Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	150,811	1,466,344	1,284,617	2,894,532
Adjusted Property EBITDAR	(104,447)	418,339	163,152	821,990
Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	89,264	910,953	814,924	1,714,898
Adjusted Property EBITDAR	(112,085)	260,788	39,635	472,585
Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	33,198	706,089	305,085	1,440,293
Adjusted Property EBITDAR	(116,288)	172,803	(138,278)	365,614
Corporate and other [Member]
Revenues
Revenues	16,536	139,857	138,000	350,431
Other operating income (expense)
Corporate and other	(159,342)	(87,606)	(261,579)	(148,137)
Casino [Member]
Revenues
Revenues	163,649	1,598,312	1,217,675	3,224,658
Casino [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	63,028	308,183	337,701	632,887
Casino [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	77,177	653,948	613,807	1,228,104
Casino [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	23,284	633,179	263,698	1,296,744
Rooms [Member]
Revenues
Revenues	31,623	586,503	465,574	1,160,718
Rooms [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	26,105	469,736	388,969	938,588
Rooms [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	4,181	81,454	60,060	153,252
Rooms [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	1,335	35,313	16,544	68,877
Food and Beverage [Member]
Revenues
Revenues	29,771	544,552	426,480	1,064,773
Food and Beverage [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	21,026	389,773	309,789	755,295
Food and Beverage [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	4,314	123,870	99,406	241,749
Food and Beverage [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	4,431	30,909	17,211	61,622
Entertainment, Retail and Other [Member]
Revenues
Revenues	48,569	382,738	318,514	727,112
Entertainment, Retail and Other [Member] | Reportable segments [Member] | Las Vegas Strip Resorts [Member]
Revenues
Revenues	40,652	298,652	248,158	567,762
Entertainment, Retail and Other [Member] | Reportable segments [Member] | Regional Operations [Member]
Revenues
Revenues	3,592	51,681	41,651	91,793
Entertainment, Retail and Other [Member] | Reportable segments [Member] | MGM China [Member]
Revenues
Revenues	$ 4,148	$ 6,688	$ 7,632	$ 13,050

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