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Investments in Unconsolidated Joint Ventures: Company Ownership (Details)
Dec. 31, 2014
443 Wabash MAB LLC  
Investments in unconsolidated joint ventures:  
Ownership % 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_A443WabashMABLLCMember
Biltmore Shopping Center Partners LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_BiltmoreShoppingCenterPartnersLLCMember
Candlestick Center LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.10%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_CandlestickCenterLLCMember
Coolidge Holding LLC  
Investments in unconsolidated joint ventures:  
Ownership % 37.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_CoolidgeHoldingMember
Corte Madera Village, LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.10%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_CorteMaderaVillageLLCMember
Gallery, The—Various Entities  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_TheGalleryVariousEntitiesMember
Jaren Associates 4  
Investments in unconsolidated joint ventures:  
Ownership % 12.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_JarenAssociates4Member
Kierland Commons Investment LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_KierlandCommonsInvestmentLLCMember
Macerich Northwestern Associates—Broadway Plaza  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_MacerichNorthwesternAssociatesBroadwayPlazaMember
North Bridge Chicago LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_NorthBridgeChicagoLLCMember
One Scottsdale Investors LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_OneScottsdaleMember
Propcor II Associates, LLC—Boulevard Shops  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_PropcorIIAssociatesLLCBoulevardShopsMember
Scottsdale Fashion Square Partnership  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_ScottsdaleFashionSquarePartnershipMember
The Market at Estrella Falls LLC  
Investments in unconsolidated joint ventures:  
Ownership % 39.70%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_TheMarketAtEstrellaFallsMember
Tysons Corner LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_TysonsCornerLLCMember
Tysons Corner Property Holdings II LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_TysonsCornerPropertyHoldingsIILLCMember
Tysons Corner Property LLC  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_TysonsCornerPropertyLLCMember
West Acres Development, LLP  
Investments in unconsolidated joint ventures:  
Ownership % 19.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_WestAcresDevelopmentLLPMember
Westcor/Gilbert, L.L.C.  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_WestcorGilbertLLCMember
Westcor/Queen Creek LLC  
Investments in unconsolidated joint ventures:  
Ownership % 37.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_WestcorQueenCreekLLCMember
Westcor/Surprise Auto Park LLC  
Investments in unconsolidated joint ventures:  
Ownership % 33.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_WestcorSurpriseAutoParkLLCMember
WMAP, L.L.C.—Atlas Park  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_WMAPLLCAtlasParkMember
WM Inland LP(2)  
Investments in unconsolidated joint ventures:  
Ownership % 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mac_WMInlandLPMember