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Acquisitions - Remeasurement Gain (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 0 Months Ended |
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Mar. 31, 2015 | Mar. 31, 2014 | Jun. 04, 2014 | Nov. 14, 2014 | Dec. 31, 2014
Acquisition |  |  |  |  |
Carrying value of investment | $ (1,006,652)us-gaap_EquityMethodInvestments |  |  |  | $ (984,132)us-gaap_EquityMethodInvestments
Gain on remeasurement of assets | 22,103 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss |  |  |
Inland Center |  |  |  |  |
Acquisition |  |  |  |  |
Fair value of existing ownership interest (at % ownership) |  |  | 26,250 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember |  |
Carrying value of investment |  |  | (4,147)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember |  |
Gain on remeasurement of assets |  |  | 22,103 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember |  |
PPRLP Queens Portfolio |  |  |  |  |
Acquisition |  |  |  |  |
Fair value of existing ownership interest (at % ownership) |  |  |  | 1,214,401 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |
Carrying value of investment |  |  |  | (208,735)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |
Gain on remeasurement of assets |  |  |  | $ 1,423,136 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |
Ownership interest before acquisition (as a percent) |  |  |  | 51.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |

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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + 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 (g)(1) -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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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before 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 (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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