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Mortgage Notes Payable - Footnotes (Details) (USD $) | 3 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 03, 2015 | Feb. 25, 2015 | Sep. 30, 2009 | Dec. 31, 2014 | Jan. 01, 2015 | Feb. 19, 2015
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Carrying Amount of Mortgage Notes, Other | $ 5,200,053,000 mac_SecuredDebtNonrelatedParty |  |  |  |  | $ 5,115,482,000 mac_SecuredDebtNonrelatedParty |  |
Related parties | 286,849,000 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent |  |  |  |  | 289,039,000 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent |  |
Gain on extinguishment of debt, net | 2,245,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | (358,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |
Mortgage notes payable which could become recourse | 13,500,000 mac_MortgageNotesPayableProbableRecourseAmount |  |  |  |  | 73,165,000 mac_MortgageNotesPayableProbableRecourseAmount |  |
Interest expense capitalized | 2,629,000 us-gaap_InterestCostsCapitalized | 2,485,000 us-gaap_InterestCostsCapitalized |  |  |  |  |  |
Fair value of mortgage notes payable | 5,538,879,000 us-gaap_NotesPayableFairValueDisclosure |  |  |  |  | 5,455,453,000 us-gaap_NotesPayableFairValueDisclosure |  |
Fashion Outlets of Chicago |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Carrying Amount of Mortgage Notes, Other | 200,000,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_FashionOutletsOfChicagoMortgageMember |  |  |  |  | 119,329,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_FashionOutletsOfChicagoMortgageMember |  |
Interest rate basis | LIBOR |  |  |  |  |  |  |
Interest rate spread over basis (as a percent) |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mac_FashionOutletsOfChicagoMortgageMember |  |  |  |  |
Effective interest rate (as a percent) | 1.83%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_FashionOutletsOfChicagoMortgageMember |  |  |  |  | 2.97%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_FashionOutletsOfChicagoMortgageMember |  |
Related parties | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_FashionOutletsOfChicagoMortgageMember |  |  |  |  | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_FashionOutletsOfChicagoMortgageMember |  |
Great Northern Mall |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Carrying Amount of Mortgage Notes, Other | 34,232,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_GreatNorthernMallMortgageMember |  |  |  |  | 34,494,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_GreatNorthernMallMortgageMember |  |
Effective interest rate (as a percent) | 6.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_GreatNorthernMallMortgageMember |  |  |  |  |  |  |
Default interest rate (as a percent) |  |  |  |  |  |  | 4.00%mac_DebtInstrumentDefaultInterest / us-gaap_DebtInstrumentAxis = mac_GreatNorthernMallMortgageMember |
Related parties | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_GreatNorthernMallMortgageMember |  |  |  |  | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_GreatNorthernMallMortgageMember |  |
Lakewood Center Mortgage |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Carrying Amount of Mortgage Notes, Other | 0 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember |  |  |  |  | 253,708,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember |  |
Related parties | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember |  |  |  |  | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember |  |
Gain on extinguishment of debt, net |  |  |  | 2,245,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = mac_LakewoodCenterMortgageMember |  |  |  |
The Mall at Northgate |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Carrying Amount of Mortgage Notes, Other | 64,000,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_TheMallAtNorthgateMortgageMember |  |  |  |  | 64,000,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_TheMallAtNorthgateMortgageMember |  |
Interest rate basis | LIBOR |  |  |  |  |  |  |
Interest rate spread over basis (as a percent) | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mac_TheMallAtNorthgateMortgageMember |  |  |  |  |  |  |
Effective interest rate (as a percent) | 3.06%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_TheMallAtNorthgateMortgageMember |  |  |  |  | 3.05%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_TheMallAtNorthgateMortgageMember |  |
Related parties | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_TheMallAtNorthgateMortgageMember |  |  |  |  | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_TheMallAtNorthgateMortgageMember |  |
Mall of Victor Valley |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Carrying Amount of Mortgage Notes, Other | 115,000,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_MallOfVictorValleyMortgageMember |  |  |  |  | 115,000,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_MallOfVictorValleyMortgageMember |  |
Effective interest rate (as a percent) | 4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_MallOfVictorValleyMortgageMember |  |  |  |  |  |  |
Related parties | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_MallOfVictorValleyMortgageMember |  |  |  |  | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_MallOfVictorValleyMortgageMember |  |
Superstition Springs Center |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Carrying Amount of Mortgage Notes, Other | 68,000,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_SuperstitionSpringsCenterMember |  |  |  |  | 68,079,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_SuperstitionSpringsCenterMember |  |
Interest rate basis | LIBOR |  |  |  |  |  |  |
Interest rate spread over basis (as a percent) | 2.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mac_SuperstitionSpringsCenterMember |  |  |  |  |  |  |
Effective interest rate (as a percent) | 2.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_SuperstitionSpringsCenterMember |  |  |  |  | 1.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_SuperstitionSpringsCenterMember |  |
Related parties | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_SuperstitionSpringsCenterMember |  |  |  |  | 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_SuperstitionSpringsCenterMember |  |
Vintage Faire Mall |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Carrying Amount of Mortgage Notes, Other | 280,000,000 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_VintageFaireMallMortgageMember |  |  |  |  | 0 mac_SecuredDebtNonrelatedParty / us-gaap_DebtInstrumentAxis = mac_VintageFaireMallMortgageMember |  |
Effective interest rate (as a percent) | 3.55%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = mac_VintageFaireMallMortgageMember |  |  |  |  |  |  |
Related parties | $ 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_VintageFaireMallMortgageMember |  |  |  |  | $ 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_VintageFaireMallMortgageMember |  | $ 280,000,000 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mac_VintageFaireMallMortgageMember
Freehold Raceway Mall and Chandler Fashion Center |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |
Percentage of loan assumed by third party (as a percent) |  |  |  |  | 49.90%mac_PercentageOfLoanAssumedByThirdParty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember |  |  |

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- Definition Represents the amount of mortgage notes payable which could become recourse to the entity. + References No definition available. + Details
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- Definition Portion of the loan assumed by a third party. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations such as mortgage loans. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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