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Co-Venture Arrangement: (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2009 | Mar. 31, 2015 | Dec. 31, 2014
Co-Venture Arrangement: |  |  |
Co-venture obligation |  | $ 72,864 us-gaap_DeferredGainOnSaleOfProperty | $ 75,450 us-gaap_DeferredGainOnSaleOfProperty
Freehold Raceway Mall and Chandler Fashion Center |  |  |
Co-Venture Arrangement: |  |  |
Percentage of loan assumed by third party (as a percent) | 49.90%mac_JointVentureOwnershipPercentageSold / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember |  |
Co-venture obligation | $ 168,154 us-gaap_DeferredGainOnSaleOfProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember |  |
Freehold Raceway Mall |  |  |
Co-Venture Arrangement: |  |  |
Property area (in square feet) | 1,668,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallMember |  |
Chandler Fashion Center |  |  |
Co-Venture Arrangement: |  |  |
Property area (in square feet) | 1,320,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_ChandlerFashionCenterMember |  |

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- Definition The percentage of ownership interest in the joint venture sold by the entity during the period. + References No definition available. + Details
Name: | mac_JointVentureOwnershipPercentageSold
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | mac_ScheduleOfJointVenturesLineItems
Namespace Prefix: | mac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.U.Q2) -URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791 + Details
Name: | us-gaap_DeferredGainOnSaleOfProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=mac_ChandlerFashionCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=mac_FreeholdRacewayMallMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |