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Property: Narrative (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 28, 2014
Acquisition        
Gain (loss) on sale or write down of assets, net $ 73,440mac_GainLossonSaleorWriteDownofAssets $ (78,057)mac_GainLossonSaleorWriteDownofAssets $ 28,734mac_GainLossonSaleorWriteDownofAssets  
(Loss) gain on sale of assets 3,643mac_EquityMethodInvestmentSummarizedFinancialInformationGainLossOnSaleAndRemeasurementOfAssets 190,526mac_EquityMethodInvestmentSummarizedFinancialInformationGainLossOnSaleAndRemeasurementOfAssets 29,301mac_EquityMethodInvestmentSummarizedFinancialInformationGainLossOnSaleAndRemeasurementOfAssets  
Gain (Loss) on sale of assets 1,257us-gaap_GainLossOnDispositionOfAssets 5,390us-gaap_GainLossOnDispositionOfAssets (390)us-gaap_GainLossOnDispositionOfAssets  
Loss on write-off of development costs     (19,360)mac_GainLossOnSaleOrRemeasurementOfAssetsAndInterestsInUnconsolidatedEntities  
Write-off of Development Cost (40,561)mac_WriteOffOfDevelopmentCost (1,250)mac_WriteOffOfDevelopmentCost    
Impairment charge (41,216)us-gaap_ImpairmentOfLongLivedAssetsHeldForUse (82,197)us-gaap_ImpairmentOfLongLivedAssetsHeldForUse    
Various Properties        
Acquisition        
(Loss) gain on sale of assets 144,927mac_EquityMethodInvestmentSummarizedFinancialInformationGainLossOnSaleAndRemeasurementOfAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mac_VariousPropertiesMember
     
Wilshire Boulevard        
Acquisition        
(Loss) gain on sale of assets 9,033mac_EquityMethodInvestmentSummarizedFinancialInformationGainLossOnSaleAndRemeasurementOfAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mac_WilshireBoulevardMember
    9,033mac_EquityMethodInvestmentSummarizedFinancialInformationGainLossOnSaleAndRemeasurementOfAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mac_WilshireBoulevardMember
Chandler Village Center, Chandler Festival, Chandler Gateway and NorthPark Center        
Acquisition        
Gain (Loss) on sale of assets     $ 48,484us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mac_ChandlerVillageCenterChandlerFestivalChandlerGatewayandNorthParkCenterMember
 
Mervyn's        
Acquisition        
Number of properties 3us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FormerMervynsStoresMember