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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ 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
Statement Of Income And Comprehensive Income [Abstract]
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
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment									28,870	(13,022)	(43,188)
Other comprehensive income (loss) related to cash flow hedges									(29,505)	3,576	7,995
Other comprehensive loss									(635)	(9,446)	(35,193)
Comprehensive income									2,213,745	574,448	2,052,991
Less: Comprehensive income attributable to noncontrolling interests									(168,447)	(112,622)	(119,700)
Comprehensive income attributable to MGM Resorts International									$ 2,045,298	$ 461,826	$ 1,933,291

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