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Share and Unit-based Plans - Long-Term Incentive Plan Units Narrative (Details)	12 Months Ended
	Dec. 31, 2020
Stock units
Share and unit-based plans [Line Items]
Conversion rate	1
LTIP units
Share and unit-based plans [Line Items]
Conversion rate	1

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Other than Options, Conversion Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	mac_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=mac_StockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=mac_LongTermIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: