Stockholders' Equity - Summary of Net Income Attributable to and Transfers from Noncontrolling Interest, Which Shows Effects of Changes in Company's Ownership Interest in a Subsidiary (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stockholders Equity Note [Line Items]
Net income (loss) attributable to MGM Resorts International	$ 1,254,370	$ (1,032,724)	$ 2,049,146
Transfers from/(to) noncontrolling interest:
MGP Class A share issuance	3,240	646	1,512
Redemption of Operating Partnership units	176,659	92,632	0
Other	(5,062)	(1,759)	(935)
Net transfers from noncontrolling interest	274,771	149,145	152,034
Change from net income (loss) attributable to MGM Resorts International and transfers to noncontrolling interest	1,529,141	(883,579)	2,201,180
Empire City
Transfers from/(to) noncontrolling interest:
Net transfers from noncontrolling interest	0	0	(18,718)
Park MGM
Transfers from/(to) noncontrolling interest:
Net transfers from noncontrolling interest	0	0	(1,968)
Northfield OpCo
Transfers from/(to) noncontrolling interest:
Net transfers from noncontrolling interest	0	0	21,679
MGM Growth Properties LLC \| Class A shares
Transfers from/(to) noncontrolling interest:
MGP Class A share issuance	103,174	64,834	151,976
MGP BREIT Venture
Transfers from/(to) noncontrolling interest:
Net transfers from noncontrolling interest	$ 0	$ (6,562)	$ 0

Stockholders' Equity - Summary of Net Income Attributable to and Transfers from Noncontrolling Interest, Which Shows Effects of Changes in Company's Ownership Interest in a Subsidiary (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Stockholders Equity Note [Line Items]

Net income (loss) attributable to MGM Resorts International

$ 1,254,370

$ (1,032,724)

$ 2,049,146

Transfers from/(to) noncontrolling interest:

MGP Class A share issuance

3,240