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v2.4.0.8

Commitments and Contingencies (Details) | Jun. 30, 2014 Y
--- | ---
Long-term Purchase Commitment [Line Items] |
Minimum remaining lease period | 7
Maximum remaining lease period | 75

X
- Definition Maximum remaining lease period. + References No definition available. + Details
Name: | bdn_MaximumRemainingLeasePeriod
Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum remaining lease period. + References No definition available. + Details
Name: | bdn_MinimumRemainingLeasePeriod
Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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