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Noncontrolling interests (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
sqft
Mar. 31, 2014
Noncontrolling interests    
Area of Real Estate Property 18,527,998us-gaap_AreaOfRealEstateProperty  
Payable for purchase of noncontrolling interest $ 113,967us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries $ 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
Income (Loss) from Continuing Operations Attributable to Parent 24,559us-gaap_IncomeLossFromContinuingOperations 39,716us-gaap_IncomeLossFromContinuingOperations
(Loss) income from discontinued operations, net (43)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (162)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests (113,967)us-gaap_MinorityInterestDecreaseFromRedemptions [1]  
Noncontrolling Interests    
Noncontrolling interests    
Number of projects subject to ownership from noncontrolling interests 4are_NumberofRealEstateProjectsSubjecttoOwnershipfromNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests (65,504)us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Alexandria Technology Square [Member]    
Noncontrolling interests    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= are_AlexandriaTechnologySquareMember
 
Payable for purchase of noncontrolling interest 108,300us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
/ us-gaap_BusinessAcquisitionAxis
= are_AlexandriaTechnologySquareMember
 
Second Installment Payment [Member] | Alexandria Technology Square [Member]    
Noncontrolling interests    
Payable for purchase of noncontrolling interest 54,000us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
/ us-gaap_BusinessAcquisitionAxis
= are_AlexandriaTechnologySquareMember
/ are_InstallmentPaymentAxis
= are_SecondInstallmentPaymentMember
 
Installment Payment [Member] | Alexandria Technology Square [Member]    
Noncontrolling interests    
Payable for purchase of noncontrolling interest $ 54,300us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
/ us-gaap_BusinessAcquisitionAxis
= are_AlexandriaTechnologySquareMember
/ are_InstallmentPaymentAxis
= are_InstallmentPaymentMember
 
Alexandria Technology Square [Member]    
Noncontrolling interests    
Area of Real Estate Property 1,181,635us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= are_AlexandriaTechnologySquareMember
 
[1] For additional information, refer to Note 11 – “Noncontrolling Interests” to our unaudited consolidated financial statements under Item 1 of this report.