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Acquisitions: Percentage Ownership (Details) | Oct. 03, 2012 | Oct. 26, 2012 | Jun. 04, 2014 | Oct. 24, 2013 | Sep. 16, 2013 | Nov. 14, 2014
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FlatIron Crossing |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_FlatIronCrossingMember |  |  |  |  |
Fair value of existing ownership interest (as a percent) | 25.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_FlatIronCrossingMember |  |  |  |  |
Arrowhead Towne Center |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_ArrowheadTowneCenterMember |  |  |  |
Fair value of existing ownership interest (as a percent) |  | 66.70%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_ArrowheadTowneCenterMember |  |  |  |
Cascade Mall |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_CascadeMallMember |  |  |
Superstition Springs Land I |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_SuperstitionSpringsLandIMember |  |
Fair value of existing ownership interest (as a percent) |  |  |  | 66.70%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_SuperstitionSpringsLandIMember |  |
Camelback Colonnade |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_CamelbackColonnadeMember |
Fair value of existing ownership interest (as a percent) |  |  |  |  | 73.20%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_CamelbackColonnadeMember |
PPRLP Queens Portfolio |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_PPRLPQueensPortfolioMember
Fair value of existing ownership interest (as a percent) |  |  |  |  |  | 51.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_PPRLPQueensPortfolioMember

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
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