XML 66 R53.htm IDEA: XBRL DOCUMENT
v3.20.4

Summary of Significant Accounting Policies - Property and Investment in Unconsolidated Joint Ventures (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020
Investment in unconsolidated joint ventures |
Threshold ownership percentage above which to use equity method of accounting only if no controlling financial interest | 50.00%
Buildings and improvements | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of assets (in years) | 5 years
Buildings and improvements | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of assets (in years) | 40 years
Tenant improvements | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of assets (in years) | 5 years
Tenant improvements | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of assets (in years) | 7 years
Equipment and furnishings | Minimum |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of assets (in years) | 5 years
Equipment and furnishings | Maximum |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of assets (in years) | 7 years

X
- Definition Represents the threshold percentage of ownership of common stock or equity participation in an investee above which the equity method of accounting is still applied only if the entity does not have a controlling financial interest in the investee. + References No definition available. + Details
Name: | mac_ThresholdOwnershipPercentageForEquityMethodAccountingOnlyIfNoControllingFinancialInterest
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mac_TenantImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mac_EquipmentAndFurnishingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |