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Co-Venture Arrangement: (Details) (USD $) In Thousands, unless otherwise specified |  |  | 0 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2009 Freehold Raceway Mall and Chandler Fashion Center
Co-Venture Arrangement: |  |  |
Percentage of loan assumed by third party (as a percent) |  |  | 49.90%
Co-venture obligation | $ 75,669 | $ 81,515 | $ 168,154

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- Definition The percentage of ownership interest in the joint venture sold by the entity during the period. + References No definition available. + Details
Name: | mac_JointVentureOwnershipPercentageSold
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | mac_ScheduleOfJointVenturesLineItems
Namespace Prefix: | mac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_DeferredGainOnSaleOfProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant