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Goodwill and Other Intangible Assets - Summary of Changes in Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	$ 1,821,392	$ 1,806,531
Acquisitions	256,133	17,915
Reclassifications	0
Currency exchange	7,039	(3,054)
Goodwill, ending balance	2,084,564	1,821,392
Las Vegas Strip Resorts [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	70,975	70,975
Acquisitions	0	0
Reclassifications	(40,523)
Currency exchange	0	0
Goodwill, ending balance	30,452	70,975
Regional Operations [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	386,892	386,892
Acquisitions	256,133	0
Reclassifications	58,438
Currency exchange	0	0
Goodwill, ending balance	701,463	386,892
MGM China [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	1,345,610	1,348,664
Acquisitions	0	0
Reclassifications	0
Currency exchange	7,039	(3,054)
Goodwill, ending balance	1,352,649	1,345,610
Corporate and Other [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill, beginning balance	17,915	0
Acquisitions	0	17,915
Reclassifications	(17,915)
Currency exchange	0	0
Goodwill, ending balance	$ 0	$ 17,915

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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