Segment Information - Schedule of Segment Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Net revenues	$ 9,680,140	$ 5,162,082	$ 12,899,672
Other operating income (expense)
Preopening and start-up expenses	(5,094)	(84)	(7,175)
Property transactions, net	67,736	(93,567)	(275,802)
Depreciation and amortization	(1,150,610)	(1,210,556)	(1,304,649)
Gain on REIT transactions, net	0	1,491,945	2,677,996
Gain on consolidation of CityCenter, net	1,562,329	0	0
October 1 litigation settlement	0	(49,000)	0
Restructuring	0	(26,025)	(92,139)
Triple-net operating lease and ground lease rent expense	(833,158)	(710,683)	(74,656)
Gain related to sale of Harmon land - unconsolidated affiliate	49,755	0	0
Income from unconsolidated affiliates related to real estate ventures	166,658	148,434	544
Operating income (loss)	2,278,699	(642,434)	3,940,215
Non-operating income (expense)
Interest expense, net of amounts capitalized	(799,593)	(676,380)	(847,932)
Non-operating items from unconsolidated affiliates	(83,243)	(103,304)	(62,296)
Other, net	65,941	(89,361)	(183,262)
Total non-operating income (expense)	(816,895)	(869,045)	(1,093,490)
Income (loss) before income taxes	1,461,804	(1,511,479)	2,846,725
Benefit (provision) for income taxes	(253,415)	191,572	(632,345)
Net income (loss)	1,208,389	(1,319,907)	2,214,380
Less: Net (income) loss attributable to noncontrolling interests	45,981	287,183	(165,234)
Net income (loss) attributable to MGM Resorts International	1,254,370	(1,032,724)	2,049,146
Capital expenditures	490,697	270,579	739,006
Chief Executive Officer
Other operating income (expense)
CEO transition expense	0	(44,401)	0
Reportable segments
Revenues
Net revenues	9,340,309	4,869,659	12,286,257
Adjusted Property EBITDAR	2,981,392	382,346	3,347,717
Non-operating income (expense)
Capital expenditures	412,339	237,319	618,986
Reportable segments | Las Vegas Strip Resorts
Revenues
Net revenues	4,737,185	2,245,785	5,831,051
Adjusted Property EBITDAR	1,738,211	232,188	1,643,122
Non-operating income (expense)
Capital expenditures	266,944	87,511	285,863
Reportable segments | Regional Operations
Revenues
Net revenues	3,392,363	1,967,171	3,549,784
Adjusted Property EBITDAR	1,217,814	343,990	969,866
Non-operating income (expense)
Capital expenditures	77,406	41,456	187,489
Reportable segments | MGM China
Revenues
Net revenues	1,210,761	656,703	2,905,422
Adjusted Property EBITDAR	25,367	(193,832)	734,729
Non-operating income (expense)
Capital expenditures	67,989	108,352	145,634
Corporate and other
Revenues
Net revenues	339,831	292,423	613,415
Other operating income (expense)
Corporate and other, net	(560,309)	(530,843)	(331,621)
Non-operating income (expense)
Capital expenditures	78,358	33,260	120,020
Casino
Revenues
Net revenues	5,362,912	2,871,720	6,517,759
Casino | Reportable segments | Las Vegas Strip Resorts
Revenues
Net revenues	1,549,419	728,254	1,296,170
Casino | Reportable segments | Regional Operations
Revenues
Net revenues	2,721,515	1,569,193	2,537,780
Casino | Reportable segments | MGM China
Revenues
Net revenues	1,057,962	565,671	2,609,806
Rooms
Revenues
Net revenues	1,690,037	830,382	2,322,579
Rooms | Reportable segments | Las Vegas Strip Resorts
Revenues
Net revenues	1,402,712	662,813	1,863,521
Rooms | Reportable segments | Regional Operations
Revenues
Net revenues	220,828	130,945	316,753
Rooms | Reportable segments | MGM China
Revenues
Net revenues	66,498	36,624	142,306
Food and beverage
Revenues
Net revenues	1,391,605	696,040	2,145,247
Food and beverage | Reportable segments | Las Vegas Strip Resorts
Revenues
Net revenues	1,015,366	471,529	1,517,745
Food and beverage | Reportable segments | Regional Operations
Revenues
Net revenues	307,750	184,153	494,243
Food and beverage | Reportable segments | MGM China
Revenues
Net revenues	68,489	40,284	127,152
Entertainment, retail and other
Revenues
Net revenues	1,009,503	518,991	1,477,200
Entertainment, retail and other | Reportable segments | Las Vegas Strip Resorts
Revenues
Net revenues	769,688	383,189	1,153,615
Entertainment, retail and other | Reportable segments | Regional Operations
Revenues
Net revenues	142,270	82,880	201,008
Entertainment, retail and other | Reportable segments | MGM China
Revenues
Net revenues	$ 17,812	$ 14,124	$ 26,158