XML 18 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Deferred Costs (Details Textuals) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Deferred Costs (Textuals) [Abstract] |  |  |  |
Capitalized internal direct leasing costs | $ 1.3 | $ 1.4 | $ 4.0 | $ 4.7

X
- Definition Capitalized internal direct leasing costs. + References No definition available. + Details
Name: | bdn_CapitalizedInternalDirectLeasingCosts
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | bdn_DeferredCostsTextualsAbstract
Namespace Prefix: | bdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration