XML 86 R41.htm IDEA: XBRL DOCUMENT
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Organization of the Parent Company and The Operating Partnership (Details) | Sep. 30, 2014 sqft Real_Estate_Investments | Sep. 30, 2013 sqft
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Parent Company [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Ownership in the Operating Partnership | 98.90% |
Net rentable square feet | 25,400,000 |
Area Owned by Company of Undeveloped Parcels Of Land | 415 |
Area Of Additional Undeveloped Parcels Of Land With Option to Purchase | 50 |
Total potential development capacity | 5,700,000 |
Unconsolidated Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net rentable square feet | 6,100,000 | 6,200,000
Number Of Unconsolidated Real Estate Ventures | 17 |
Wholly-owned Management Company Subsidiaries [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net rentable square feet | 33,700,000 |
Third Parties and Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net rentable square feet | 8,300,000 |
Total Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 205 |
Office Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 169 |
Industrial Facilities [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 20 |
Mixed Use Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 5 |
Retail Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 1 |
Core Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 195 |
Assets Held-for-sale [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 5 |
Development Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 3 |
Redevelopment Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 1 |
Re-entitlement Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 1 |

X
- Definition Area Of Additional Undeveloped Parcels Of Land With Option to Purchase + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
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Period Type: | instant

X
- Definition Area Owned by Company of Undeveloped Parcels Of Land + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of unconsolidated real estate ventures. + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: | bdn_
Data Type: | xbrli:stringItemType
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Period Type: | duration

X
- Definition The amount of development that can be supported by undeveloped land + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant