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Non Controlling Interests In the Parent Company Non Controlling Interests In the Parent Company (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Noncontrolling Interest [Abstract] |  |
Aggregate amount related to non-controlling interests classified within equity | $ 21.0 | $ 21.2
Settlement Value Of Non Controlling Interest In Operating Partnership | $ 27.4 | $ 22.5

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- Definition Settlement value of non controlling interest in operating partnership. + References No definition available. + Details
Name: | bdn_SettlementValueOfNonControllingInterestInOperatingPartnership
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount of the equity interests owned by noncontrolling partners in an operating partnership included in the entity's consolidated financial statements. + References No definition available. + Details
Name: | us-gaap_MinorityInterestInOperatingPartnerships
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_NoncontrollingInterestAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration