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Acquisitions: Narrative (Details) (USD $) | 12 Months Ended | 0 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 03, 2013 | Jul. 22, 2011 sqft | Feb. 29, 2012 sqft | Oct. 03, 2012 sqft | Oct. 26, 2012 sqft | Nov. 28, 2012 sqft | Jan. 31, 2013 | Jan. 24, 2013 sqft | Apr. 25, 2013 acre | Oct. 24, 2013 | Jun. 04, 2014 | Nov. 14, 2014 | Oct. 31, 2014 | Sep. 17, 2013 sqft | Sep. 16, 2013
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities | $ 1,414,659,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | $ 257,064,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | $ 420,123,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits paid | 0 mac_DepositsOnPaymentsToAcquireRealEstate | 0 mac_DepositsOnPaymentsToAcquireRealEstate | 30,000,000 mac_DepositsOnPaymentsToAcquireRealEstate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kings Plaza Shopping Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Placement of mortgage note on the property |  |  |  | 146,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = mac_KingsPlazaMortgageMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Camelback Colonnade |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 619,000 us-gaap_AreaOfRealEstateProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_CamelbackColonnadeMember |
Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73.20%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_CamelbackColonnadeMember
Additional ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67.50%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_CamelbackColonnadeMember |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mac_CamelbackColonnadeMember
Fashion Outlets of Niagara |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  | 686,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = mac_FashionOutletsOfNiagaraMember |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | 200,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_FashionOutletsOfNiagaraMember |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration | 18,667,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mac_FashionOutletsOfNiagaraMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
500 North Michigan Avenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  | 326,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = mac_NorthMichiganAvenue500Member |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | 70,925,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_NorthMichiganAvenue500Member |  |  |  |  |  |  |  |  |  |  |  |
FlatIron Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  | 1,434,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 310,397,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  | 195,900,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  |  |  | 114,497,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) | 75.00%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |  |  | 75.00%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |  |  |  |  |  |  |  |
Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  |  | 1,198,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | 144,400,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  |  | 69,025,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  |  |  |  | 75,375,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  |  |  |  |  |  | 33.30%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |  |  |  |  |  |  |  |
Kings Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  |  |  | 1,191,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = mac_KingsPlazaMember |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  | 756,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_KingsPlazaMember |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  |  |  | 726,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mac_KingsPlazaMember |  |  |  |  |  |  |  |  |
Issuance restricted common stock |  |  |  |  |  |  |  |  | 30,000,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = mac_KingsPlazaMember |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_BusinessAcquisitionAxis = mac_KingsPlazaMember |  |  |  |  |  |  |  |  |
Placement of mortgage note on the property |  |  |  |  |  |  |  |  | 354,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_BusinessAcquisitionAxis = mac_KingsPlazaMember |  |  |  |  |  |  |  |  |
Green Acres Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  |  |  |  |  | 1,790,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresMallMember |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | 500,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresMallMember |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresMallMember |  |  |  |  |  |  |
Placement of mortgage note on the property |  |  |  |  |  |  |  |  |  | 225,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresMallMember | 100,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresMallMember |  |  |  |  |  |  |
Deposits paid |  | 30,000,000 mac_DepositsOnPaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresMallMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price, balance remaining after deposit |  |  |  |  |  |  |  |  |  |  | 470,000,000 mac_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceBalanceAfterDeposit / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresMallMember |  |  |  |  |  |  |
Green Acres Adjacent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  |  |  |  |  |  | 19 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresAdjacentMember |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  | 22,577,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_GreenAcresAdjacentMember |  |  |  |  |  |
Superstition Springs Land I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  | 46,162,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 23,662,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 22,500,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |  |  |  |
Additional ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 33.30%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |  |  |  |
Cascade Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,233,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember |  |  |  |
Incremental revenue generated from acquired property | 4,458,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental earnings (loss) of acquired property | 380,000 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember |  |  |  |  |
PPRLP Queens Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,838,886,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 672,109,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |  |  |
Issuance restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,166,777,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |  |  |
Incremental revenue generated from acquired property | 40,378,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental earnings (loss) of acquired property | 4,285,000 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00%mac_BusinessCombinationStepAcquisitionAdditionalEquityInterestAcquiredPercentage / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember |  |  |
Affiliated Entity | Fashion Outlets of Chicago |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  | 529,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,987,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |  |
Fair value of contingent consideration | 10,142,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest adjustment | 76,141,000 mac_AcquisitionNoncontrollingInterestAdjustment / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,867,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,120,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FashionOutletsOfChicagoMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember |  |

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- Definition Represents the cash outflow for deposits on the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References No definition available. + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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