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Subsequent Events: (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 30, 2015	Feb. 17, 2015	Feb. 19, 2015
Subsequent events
Purchase price paid through assumption of debt by the Company	$ 1,414,659,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1	$ 257,064,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1	$ 420,123,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
Related parties	289,039,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent	269,381,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
Subsequent Event
Subsequent events
Dividend/distribution for common stockholders and OP Unit holders (in dollars per share)				$ 0.65us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event | Vintage Faire Mall
Subsequent events
Related parties						280,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_VintageFaireMallMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Interest rate (as a percent)						3.49%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_VintageFaireMallMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Inland Center | Subsequent Event
Subsequent events
Additional ownership interest (as a percent)					50.00%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Property square footage					933,000us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Purchase price on acquisition					51,250,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Purchase price funded by cash payment on acquisition					26,250,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Purchase price paid through assumption of debt by the Company					25,000,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Loan paid off					$ 50,000,000us-gaap_RepaymentsOfDebt / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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