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Stockholders' Equity (Details) (USD $) | 0 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Nov. 14, 2014 | Mar. 31, 2015 | Dec. 31, 2014 | Aug. 20, 2014 | Aug. 17, 2012
Class of Stock [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Maximum price of common stock available to be issued |  | $ 500,000 mac_MaximumAggregateCommonStockOfferPrice |  | $ 500,000 mac_MaximumAggregateCommonStockOfferPrice | $ 500,000,000 mac_MaximumAggregateCommonStockOfferPrice
Commission to sales agent (as a percent) |  |  |  |  | 2.00%mac_PercentageOfCommissionToSalesAgent
PPRLP Queens Portfolio |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock issued | $ 1,166,777,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |  |  |  |
PPRLP Queens Portfolio | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares | 17,140,845 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |

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