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Co-Venture Arrangement: (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2009
Co-Venture Arrangement: |  |  |  |
Cash proceeds for the overall transaction | $ 320,123 mac_ProceedsFromSaleOfPartnershipInterestsOtherAssetsAndDiscontinuedOperationsNet | $ 416,077 mac_ProceedsFromSaleOfPartnershipInterestsOtherAssetsAndDiscontinuedOperationsNet | $ 136,707 mac_ProceedsFromSaleOfPartnershipInterestsOtherAssetsAndDiscontinuedOperationsNet |
Co-venture obligation | 75,450 us-gaap_DeferredGainOnSaleOfProperty | 81,515 us-gaap_DeferredGainOnSaleOfProperty |  |
Freehold Raceway Mall and Chandler Fashion Center |  |  |  |
Co-Venture Arrangement: |  |  |  |
Ownership interest (as a percent) |  |  |  | 49.90%mac_JointVentureOwnershipPercentageSold / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Warrant in favor of the third party to purchase shares of common stock (in shares) |  |  |  | 935,358 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Exercise price of stock warrants (in dollars per share) |  |  |  | $ 46.68 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Cash proceeds for the overall transaction |  |  |  | 174,650 mac_ProceedsFromSaleOfPartnershipInterestsOtherAssetsAndDiscontinuedOperationsNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Proceeds attributed to warrants |  |  |  | 6,496 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Co-venture obligation |  |  |  | $ 168,154 us-gaap_DeferredGainOnSaleOfProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Freehold Raceway Mall |  |  |  |
Co-Venture Arrangement: |  |  |  |
Property square footage |  |  |  | 1,668,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallMember
Chandler Fashion Center |  |  |  |
Co-Venture Arrangement: |  |  |  |
Property square footage |  |  |  | 1,320,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_ChandlerFashionCenterMember

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- Definition Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28183637&loc=d3e4724-112606 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 + Details
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- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.U.Q2) -URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791 + Details
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