XML 112 R84.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Deferred Costs (Textual) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Deferred Costs (Textuals) [Abstract] |  |  |
Capitalized internal direct leasing costs | $ 6.6 | $ 7.1 | $ 7.5

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
- Definition Deferred costs. + References No definition available. + Details
Name: | bdn_DeferredCostsTextualsAbstract
Namespace Prefix: | bdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration