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Tenant and Other Receivables: (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Mar. 17, 2014
Components of tenant and other receivables, net      
Allowance for doubtful accounts $ 3,234us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables $ 2,878us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables  
Deferred rent receivables due to straight-line rent adjustments 57,278us-gaap_DeferredRentReceivablesNet 53,380us-gaap_DeferredRentReceivablesNet  
Accrued percentage rents      
Components of tenant and other receivables, net      
Accounts receivable 13,436us-gaap_AccountsReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AccruedIncomeReceivableMember
9,824us-gaap_AccountsReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AccruedIncomeReceivableMember
 
Note Receivable1      
Components of tenant and other receivables, net      
Notes receivable interest rate (as a percent)     6.46%mac_NotesReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_NoteReceivable1Member
Notes receivable 6,436us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_NoteReceivable1Member
  6,500us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_NoteReceivable1Member
Note Receivable2      
Components of tenant and other receivables, net      
Notes receivable interest rate (as a percent)     5.00%mac_NotesReceivableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_NoteReceivable2Member
Notes receivable     $ 3,103us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mac_NoteReceivable2Member