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Quarterly Financial Data: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 14, 2014 | Dec. 11, 2013
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 322,909 us-gaap_Revenues | $ 263,491 us-gaap_Revenues | $ 254,336 us-gaap_Revenues | $ 264,511 us-gaap_Revenues | $ 282,137 us-gaap_Revenues | $ 258,154 us-gaap_Revenues | $ 245,877 us-gaap_Revenues | $ 243,307 us-gaap_Revenues | $ 1,105,247 us-gaap_Revenues | $ 1,029,475 us-gaap_Revenues | $ 797,517 us-gaap_Revenues |  |
Net income (loss) attributable to common stockholders | 1,429,221 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 35,914 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 16,088 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 17,819 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 144,878 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 38,123 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 218,997 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 18,092 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,499,042 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 420,090 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 337,426 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |
Net income (loss) attributable to common stockholders per share-basic (in dollars per share) | $ 9.52 us-gaap_EarningsPerShareBasic | $ 0.25 us-gaap_EarningsPerShareBasic | $ 0.11 us-gaap_EarningsPerShareBasic | $ 0.13 us-gaap_EarningsPerShareBasic | $ 1.03 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 1.57 us-gaap_EarningsPerShareBasic | $ 0.13 us-gaap_EarningsPerShareBasic | $ 10.46 us-gaap_EarningsPerShareBasic | $ 3.01 us-gaap_EarningsPerShareBasic | $ 2.51 us-gaap_EarningsPerShareBasic |  |
Net income (loss) attributable to common stockholders per share-diluted (in dollars per share) | $ 9.51 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.11 us-gaap_EarningsPerShareDiluted | $ 0.13 us-gaap_EarningsPerShareDiluted | $ 1.03 us-gaap_EarningsPerShareDiluted | $ 0.27 us-gaap_EarningsPerShareDiluted | $ 1.57 us-gaap_EarningsPerShareDiluted | $ 0.13 us-gaap_EarningsPerShareDiluted | $ 10.45 us-gaap_EarningsPerShareDiluted | $ 3.00 us-gaap_EarningsPerShareDiluted | $ 2.51 us-gaap_EarningsPerShareDiluted |  |
Remeasurement gain on acquisition of additional interest |  |  |  |  |  |  |  |  | 1,423,136 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss | 51,205 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss | 199,956 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss |  |
Gain (loss) from sale |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 286,414 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 50,811 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |
PPRLP Queens Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain on acquisition of additional interest |  |  |  |  |  |  |  |  |  |  |  | 1,423,136 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |
Chesterfield Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 151,467 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_ChesterfieldTowneCenterMember

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