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Subsequent Events (Details) (USD $) In Millions | Jun. 30, 2011
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Company prepaid its Plymouth Meeting Executive Center mortgage debt without penalty | $ 60.0
Deferred financing costs | $ 0.8

X
- Definition Deferred financing cost expected to be write off. + Details
Name: | bdn_DeferredFinancingCostExpectedToBeWriteOff
Namespace Prefix: | bdn
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Company prepaid mortgage debt without penalty. + Details
Name: | bdn_PrepaidMortgageDebtWithoutPenalty
Namespace Prefix: | bdn
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant