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Related-Party Transactions: (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 13, 2014
sqft
Related party transactions        
Interest expense, related party $ 15,134us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 15,016us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 15,386us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty  
Loans to unconsolidated joint ventures 0us-gaap_DueFromJointVentures 2,756us-gaap_DueFromJointVentures    
Due from affiliates 80,232us-gaap_DueFromAffiliates 30,132us-gaap_DueFromAffiliates    
Limited partnership interest of the operating partnership (as a percent) 6.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners 7.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners    
Related Parties Note Receivable, RED Consolidated Holdings, LLC        
Related party transactions        
Interest income, related party 614us-gaap_RevenueFromRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
525us-gaap_RevenueFromRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
   
Due from affiliates 11,027us-gaap_DueFromAffiliates
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
12,707us-gaap_DueFromAffiliates
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
   
Notes receivable interest rate 5.25%mac_NotesReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
     
Unconsolidated joint ventures        
Related party transactions        
Interest income, related party 164us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesMember
281us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesMember
254us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesMember
 
Due from affiliates 3,869us-gaap_DueFromAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesMember
3,822us-gaap_DueFromAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesMember
   
Northwestern Mutual Life (NML)        
Related party transactions        
Interest expense payable, related party 1,125mac_InterestExpensePayableRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_NorthwesternMutualLifeMember
1,240mac_InterestExpensePayableRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_NorthwesternMutualLifeMember
   
Unconsolidated joint ventures and third-party managed properties        
Related party transactions        
Management Fees 18,705us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
21,993us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
24,007us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
 
Development and Leasing Fees 11,822mac_DevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
10,859mac_DevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
13,165mac_DevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
 
Fees charged to unconsolidated joint ventures and third-party managed properties 30,527mac_ManagementDevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
32,852mac_ManagementDevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
37,172mac_ManagementDevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
 
Affiliated Entity        
Related party transactions        
Limited partnership interest of the operating partnership (as a percent)   40.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Affiliated Entity | Related Parties Note Receivable, AWE Talisman Company        
Related party transactions        
Interest income, related party 516us-gaap_RevenueFromRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
625us-gaap_RevenueFromRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Notes receivable interest rate   5.00%mac_NotesReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Number of notes receivable   2mac_NumberOfNotesReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Carrying value of term loan   13,603us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Fashion Outlets of Chicago | Affiliated Entity        
Related party transactions        
Property square footage   529,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FashionOutletsOfChicagoMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Candlestick Point        
Related party transactions        
Property square footage       500,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
Candlestick Point | Notes Receivable        
Related party transactions        
Note receivable       65,130us-gaap_NotesReceivableRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
Description of variable rate LIBOR      
Candlestick Point | Affiliated Entity | Notes Receivable        
Related party transactions        
Note receivable 65,336us-gaap_NotesReceivableRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
     
Description of variable rate LIBOR      
Interest earned $ 206us-gaap_InterestIncomeRelatedParty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
     
LIBOR | Candlestick Point | Affiliated Entity | Notes Receivable        
Related party transactions        
Notes receivable interest rate 2.00%mac_NotesReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember