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Segment Information Summary of Real Estate Investments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Operating properties $ 4,477,857us-gaap_RealEstateInvestmentPropertyAtCost $ 4,603,692us-gaap_RealEstateInvestmentPropertyAtCost
Less: Assets held for sale 136,802us-gaap_RealEstateHeldforsale [1] 27,436us-gaap_RealEstateHeldforsale [1]
Construction-in-progress 231,224us-gaap_DevelopmentInProcess 201,360us-gaap_DevelopmentInProcess
Land inventory 90,945us-gaap_LandAvailableForDevelopment 90,603us-gaap_LandAvailableForDevelopment
Philadelphia CBD [Member]    
Segment Reporting Information [Line Items]    
Operating properties 1,346,858us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember		 1,338,655us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PhiladelphiaCbdMember
Metropolitan Dc [Member]    
Segment Reporting Information [Line Items]    
Operating properties 1,189,601us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_MetropolitanDcMember		 1,183,652us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_MetropolitanDcMember
New Jersey/ Delaware [Member]    
Segment Reporting Information [Line Items]    
Operating properties 326,297us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember		 [2] 392,581us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_NewJerseyDelawareMember		 [2]
Richmond, Virginia [Member]    
Segment Reporting Information [Line Items]    
Operating properties 317,422us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember		 317,076us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_RichmondVirginiaMember
Pennsylvania [Member]    
Segment Reporting Information [Line Items]    
Operating properties 1,178,408us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PennsylvaniaMember		 1,178,470us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= bdn_PennsylvaniaMember
CALIFORNIA    
Segment Reporting Information [Line Items]    
Operating properties 119,271us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= stpr_CA		 [2] 193,258us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= stpr_CA		 [2]
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Operating properties 4,614,659us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 4,631,128us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
Assets Held-for-sale [Member]    
Segment Reporting Information [Line Items]    
Less: Assets held for sale 136,802us-gaap_RealEstateHeldforsale
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AssetsHeldForSaleMember		 [2] 27,436us-gaap_RealEstateHeldforsale
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AssetsHeldForSaleMember		 [2]
Corporate Segment [Member]    
Segment Reporting Information [Line Items]    
Construction-in-progress 231,224us-gaap_DevelopmentInProcess
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 201,360us-gaap_DevelopmentInProcess
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Land inventory $ 90,945us-gaap_LandAvailableForDevelopment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ 90,603us-gaap_LandAvailableForDevelopment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
[1] Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale.
[2] On December 31, 2014, the Company was actively marketing for sale its Atrium I and Libertyview properties, comprised of two office properties located in the New Jersey/Delaware segment. As of December 31, 2014 the properties were classified as held for sale on the consolidated balance sheet. The properties were sold on January 8, 2015. See Note 3, "Real Estate Investments," for further information. The sale is not classified as a significant disposition under the accounting guidance for discontinued operations. See Note 3, "Real Estate Investments," for further description of the five properties held for sale in the New Jersey/Delaware segment and one property held for sale in the California segment.