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Investments in real estate, net Land undergoing predevelopment and future development (Details)
Mar. 31, 2015
sqft
Real Estate Properties [Line Items]  
Area of Real Estate Property 18,527,998us-gaap_AreaOfRealEstateProperty
Near-term value-creation projects in North America (CIP)  
Real Estate Properties [Line Items]  
Area of Real Estate Property 2,164,780.00us-gaap_AreaOfRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= are_LandUndergoingPreconstructionActivitiesMember