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Stockholders' Equity: Stock Warrants: (Details) (Freehold Raceway Mall and Chandler Fashion Center, USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended
--- | --- | ---
Oct. 24, 2012 | Apr. 10, 2012 | Sep. 30, 2009 | Dec. 31, 2011
Freehold Raceway Mall and Chandler Fashion Center |  |  |  |
Stock Warrants: |  |  |  |
Aggregate number of common shares available for purchase under warrants (in shares) |  |  | 935,358 mac_ClassOfWarrantOrRightAggregateNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember |
Value of stock warrants |  |  | $ 6,496 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember |
Exercise price of stock warrants (in dollars per share) |  |  | $ 46.68 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember |
Exercise of stock warrants | $ 3,923 us-gaap_PaymentsForRepurchaseOfWarrants / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember | $ 3,448 us-gaap_PaymentsForRepurchaseOfWarrants / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember |  | $ 1,278 us-gaap_PaymentsForRepurchaseOfWarrants / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Number of common shares available for purchase under warrant (in shares) | 311,786 mac_ClassOfWarrantOrRightNetIssueExerciseOfWarrants / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember | 311,786 mac_ClassOfWarrantOrRightNetIssueExerciseOfWarrants / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember |  | 311,786 mac_ClassOfWarrantOrRightNetIssueExerciseOfWarrants / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember

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- Definition The aggregate number of securities that a class of warrants or rights outstanding gives the holder(s) the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + References No definition available. + Details
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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 The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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