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Subsequent Events: (Details) (USD $)	0 Months Ended
	Apr. 24, 2015	Apr. 17, 2015	Apr. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Subsequent events
Related parties				$ 286,849,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent	$ 289,039,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
Lakewood Center Mortgage
Subsequent events
Related parties				0us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember	0us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember
Subsequent event
Subsequent events
Dividend declared (in dollars per share)	$ 0.65us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | Lakewood Center Mortgage
Subsequent events
Related parties		410,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Effective Interest Rate (as a percent)		3.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term (in years)		11 years
Subsequent event | Sears Locations
Subsequent events
Number of stores			9us-gaap_NumberOfStores / us-gaap_BusinessAcquisitionAxis = mac_SearsLocationsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Ownership percentage acquired			50.00%mac_JointVentureOwnershipPercentagePurchased / us-gaap_BusinessAcquisitionAxis = mac_SearsLocationsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Purchase price			$ 150,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_SearsLocationsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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