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Related Party Transactions: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
note
Nov. 13, 2014
sqft
Related party transactions        
Interest expense, related party $ 2,729us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 3,708us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty    
Due from affiliates 79,582us-gaap_DueFromAffiliates   80,232us-gaap_DueFromAffiliates  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 6.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners   6.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners  
Related parties note receivable, AWE Talisman Company        
Related party transactions        
Number of notes receivable (in notes)     2mac_NumberOfNotesReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
 
Related parties note receivable, RED Consolidated Holdings, LLC        
Related party transactions        
Interest income, related party 137us-gaap_RevenueFromRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
160us-gaap_RevenueFromRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
   
Due from affiliates 10,591us-gaap_DueFromAffiliates
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
  11,027us-gaap_DueFromAffiliates
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
 
Note receivable, interest rate (as a percent) 5.25%mac_NotesReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableRedConsolidatedHoldingsLlcMember
     
Unconsolidated joint ventures and third-party managed properties        
Related party transactions        
Management fees 2,701us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
4,825us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
   
Development and leasing fees 2,072mac_DevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
2,496mac_DevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
   
Fees charged to unconsolidated joint ventures and third-party managed properties 4,773mac_ManagementDevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
7,321mac_ManagementDevelopmentAndLeasingFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesAndThirdPartyManagedPropertiesMember
   
Northwestern Mutual Life (NML)        
Related party transactions        
Interest expense payable, related party 1,119mac_InterestExpensePayableRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_NorthwesternMutualLifeMember
  1,125mac_InterestExpensePayableRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_NorthwesternMutualLifeMember
 
Unconsolidated joint ventures        
Related party transactions        
Interest income, related party   31us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesMember
   
Due from affiliates 3,222us-gaap_DueFromAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesMember
  3,869us-gaap_DueFromAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mac_UnconsolidatedJointVenturesMember
 
Affiliated Entity        
Related party transactions        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     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   154us-gaap_RevenueFromRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Number of notes receivable (in notes)   2mac_NumberOfNotesReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Note receivable, interest rate (as a percent) 5.00%mac_NotesReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_RelatedPartiesNoteReceivableAweTalismanCompanyMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
     
Fashion Outlets of Chicago | Affiliated Entity        
Related party transactions        
Property area (in square feet)     528,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_FashionOutletsOfChicagoMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
 
Candlestick Point        
Related party transactions        
Property area (in square feet)       500,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
Candlestick Point | Notes Receivable        
Related party transactions        
Description of variable rate basis LIBOR      
Note receivable       65,130us-gaap_NotesReceivableRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
Candlestick Point | Affiliated Entity | Notes Receivable        
Related party transactions        
Description of variable rate basis LIBOR      
Interest Income, Related Party 433us-gaap_InterestIncomeRelatedParty
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
     
Note receivable $ 65,769us-gaap_NotesReceivableRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
  65,336us-gaap_NotesReceivableRelatedParties
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NotesReceivableMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= mac_CandlestickPointMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
 
London Interbank Offered Rate (LIBOR) | Candlestick Point | Affiliated Entity | Notes Receivable        
Related party transactions        
Note receivable, interest rate (as a percent) 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