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Property - Narrative (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Property, Plant and Equipment [Line Items]    
Depreciation expenses $ 90,197us-gaap_DepreciationNonproduction $ 68,478us-gaap_DepreciationNonproduction
Gain on sale or write-down of assets 1,056mac_GainonSaleofWritedownofAssets  
Loss on sale or write-down of assets 121mac_LossonSaleorWriteDownofAssets  
Rotterdam Square, Somersville Town Center and Lake Square Mall    
Property, Plant and Equipment [Line Items]    
Loss on sale or write-down of assets   $ 1,611mac_LossonSaleorWriteDownofAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mac_RotterdamSquareSomersvilleTownCenterandLakeSquareMallMember