XML 83 R66.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Non Controlling Interests in The Parent Company Non Contolling Interests in the Parent Company (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Noncontrolling Interest [Abstract] |  |
Aggregate amount related to non-controlling interests classified within equity | $ 31.4 | $ 33.1
Settlement value of non controlling interest in operating partnership | $ 32.4 | $ 25.6

X
- 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

X
- 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

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