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Organization of The Parent Company and The Operating Partnership (Details) | 6 Months Ended
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Jun. 30, 2012 sqft A
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Ownership in the Operating Partnership | 98.20%
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture | 4
Parent Company [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Net rentable square feet | 24,900,000
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture | 444
Area of additional undeveloped parcels of land with option to purchase | 52
Unconsolidated real estate ventures [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Number of unconsolidated real estate ventures | 18
Net rentable square feet | 6,500,000
Wholly-owned management company subsidiaries [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Net rentable square feet | 32,300,000
Third Parties and Unconsolidated Real Estate Ventures [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Net rentable square feet | 7,400,000
Office Properties [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Number of properties with ownership interest | 204
Industrial facilities [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Number of properties with ownership interest | 20
Mixed-use properties [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Number of properties with ownership interest | 5
Development Property [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Number of properties with ownership interest | 1

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- Definition Area Of Additional Undeveloped Parcels Of Land With Option to Purchase + References No definition available. + Details
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Namespace Prefix: | bdn_
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- Definition Area owned by Real estate venture of undeveloped parcels of land (in acres). + References No definition available. + Details
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- Definition Number of unconsolidated real estate ventures. + References No definition available. + Details
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- Details
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X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
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