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Subsequent Events (Details) (Oaklands Corporate Center [Member], USD $) In Millions, unless otherwise specified | Jul. 18, 2012 sqft Properties
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Oaklands Corporate Center [Member] |
Subsequent Event [Line Items] |
Number of Properties Sold | 11
Net Rentable Space | 466,719
Sale Consideration Of Sold Property | $ 52.7

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- Definition Net Rentable Space. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Number of Properties Sold Subsequent to Balance Sheet Date + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Sale Consideration Of Sold Property. + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration