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Co-Venture Arrangement: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2009
Co-Venture Arrangement:        
Cash proceeds for the overall transaction $ 320,123mac_ProceedsFromSaleOfPartnershipInterestsOtherAssetsAndDiscontinuedOperationsNet $ 416,077mac_ProceedsFromSaleOfPartnershipInterestsOtherAssetsAndDiscontinuedOperationsNet $ 136,707mac_ProceedsFromSaleOfPartnershipInterestsOtherAssetsAndDiscontinuedOperationsNet  
Co-venture obligation 75,450us-gaap_DeferredGainOnSaleOfProperty 81,515us-gaap_DeferredGainOnSaleOfProperty    
Freehold Raceway Mall and Chandler Fashion Center        
Co-Venture Arrangement:        
Ownership interest (as a percent)       49.90%mac_JointVentureOwnershipPercentageSold
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Warrant in favor of the third party to purchase shares of common stock (in shares)       935,358us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Exercise price of stock warrants (in dollars per share)       $ 46.68us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Cash proceeds for the overall transaction       174,650mac_ProceedsFromSaleOfPartnershipInterestsOtherAssetsAndDiscontinuedOperationsNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Proceeds attributed to warrants       6,496us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Co-venture obligation       $ 168,154us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Freehold Raceway Mall        
Co-Venture Arrangement:        
Property square footage       1,668,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FreeholdRacewayMallMember
Chandler Fashion Center        
Co-Venture Arrangement:        
Property square footage       1,320,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_ChandlerFashionCenterMember