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Acquisitions - Narrative (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended	0 Months Ended
	Oct. 31, 2014	Mar. 31, 2015	Jun. 04, 2014	Nov. 14, 2014	Feb. 17, 2015
Fashion Outlets of Chicago | Affiliated Entity
Acquisition
Purchase price	$ 69,987us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Purchase price funded by cash payment on acquisition	55,867us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Purchase price paid through assumption of debt by the Company	14,120us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Contingent consideration		10,336us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Acquisition noncontrolling interest adjustment		76,141mac_AcquisitionNoncontrollingInterestAdjustment / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Cascade Mall
Acquisition
Additional ownership interest acquired (as a percent)			49.00%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember
Purchase price			15,233us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember
Ownership interest at completion of acquisition (as a percent)			100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember
PPRLP Queens Portfolio
Acquisition
Additional ownership interest acquired (as a percent)				49.00%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Purchase price				1,838,886us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Ownership interest at completion of acquisition (as a percent)				100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Purchase price paid through assumption of debt by the Company				672,109us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Common stock issued (in shares)				1,166,777us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Inland Center
Acquisition
Additional ownership interest acquired (as a percent)					50.00%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Purchase price			51,250us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember		51,250us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Ownership interest at completion of acquisition (as a percent)			100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Incremental revenue		1,735us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Incremental earnings		(231)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Purchase price funded by cash payment on acquisition					26,250us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Purchase price paid through assumption of debt by the Company			$ 25,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember		$ 25,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember

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