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Selected Quarterly Financial Results (Unaudited) - Schedule of Selected Quarterly Financial Results (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 3,185,136	$ 3,314,382	$ 3,223,243	$ 3,176,911	$ 3,052,862	$ 3,029,302	$ 2,858,695	$ 2,822,237	$ 12,899,672	$ 11,763,096	$ 10,797,479
Operating income	2,960,089	238,381	371,485	370,260	335,751	410,903	363,075	359,757	3,940,215	1,469,486	1,712,527
Net income	2,065,950	6,104	76,169	66,157	5,760	171,410	140,423	266,301	2,214,380	583,894	2,088,184
Net income (loss) 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
Earnings (loss) per share - Basic	$ 3.94	$ (0.08)	$ 0.08	$ 0.05	$ (0.06)	$ 0.26	$ 0.21	$ 0.39	$ 3.90	$ 0.82	$ 3.38
Earnings (loss) per share - Diluted	$ 3.91	$ (0.08)	$ 0.08	$ 0.05	$ (0.06)	$ 0.26	$ 0.21	$ 0.38	$ 3.88	$ 0.81	$ 3.34

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