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LEASES - Additional Information (Detail) - MGM China	3 Months Ended
	Mar. 31, 2022
M G M Macau
Leases [Line Items]
Initial contract term ending year	25 years
M G M Cotai
Leases [Line Items]
Initial contract term ending year	25 years

X

- Definition

Lease Initial Contract Term Ending Year

+ References

No definition available.

+ Details

Name:	mgm_LeaseInitialContractTermEndingYear
Namespace Prefix:	mgm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Leases.

+ References

No definition available.

+ Details

Name:	mgm_LeasesLineItems
Namespace Prefix:	mgm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=mgm_MGMChinaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsegmentsAxis=mgm_MGMMacauMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsegmentsAxis=mgm_MGMCotaiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: