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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Investments in unconsolidated joint ventures:
Total Assets	$ 3,149,722us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets		$ 3,176,604us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Mortgage notes payable that could become recourse debt to the Company	6,500us-gaap_GuaranteeObligationsMaximumExposure		33,540us-gaap_GuaranteeObligationsMaximumExposure
Indemnity of guaranteed amount	3,250mac_GuaranteeObligationsExposureIndemnifiedByThirdParty		16,770mac_GuaranteeObligationsExposureIndemnifiedByThirdParty
Amortization of difference between cost of investments and book value of underlying equity	420mac_EquityMethodInvestmentAmortizationOfDifferenceBetweenCarryingAmountAndUnderlyingEquity	1,424mac_EquityMethodInvestmentAmortizationOfDifferenceBetweenCarryingAmountAndUnderlyingEquity
Northwestern Mutual Life (NML)
Investments in unconsolidated joint ventures:
Mortgage notes payable to affiliate	603,651mac_EquityMethodInvestmentNotesPayableRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mac_NorthwesternMutualLifeMember		606,263mac_EquityMethodInvestmentNotesPayableRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mac_NorthwesternMutualLifeMember
Interest expense on borrowings from related party	8,508mac_EquityMethodInvestmentSummarizedFinancialInformationInterestExpenseRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mac_NorthwesternMutualLifeMember	9,724mac_EquityMethodInvestmentSummarizedFinancialInformationInterestExpenseRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mac_NorthwesternMutualLifeMember
Tysons Corner LLC
Investments in unconsolidated joint ventures:
Total Assets	338,546us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_TysonsCornerLLCMember		341,931us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_TysonsCornerLLCMember
Total Liabilities	$ 866,832us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_TysonsCornerLLCMember		$ 871,933us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_TysonsCornerLLCMember

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