XML 23 R33.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Organization of the Parent Company and The Operating Partnership (Details) ft² in Millions | Sep. 30, 2015 a ft² property real_estate_investment | Sep. 30, 2014 ft²
--- | --- | ---
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Area owned by real estate venture of undeveloped parcels of land | a | 4.4 |
Area owned by real estate venture in parcels of land under development | a | 22.5 |
Parent Company [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Ownership in the Operating Partnership | 99.10% |
Net Rentable Square Feet | ft² | 24.8 |
Area Owned by Company of Undeveloped Parcels Of Land | a | 413 |
Area Of Additional Undeveloped Parcels Of Land With Option to Purchase | a | 63 |
Total Potential Development Capacity | ft² | 7.8 |
Unconsolidated Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 4.0 | 5.9
Number of Unconsolidated Real Estate Ventures | real_estate_investment | 17 |
Wholly-owned Management Company Subsidiaries [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 30.9 |
Third Parties and Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 6.2 |
Total Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 192 |
Office Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 155 |
Industrial Facilities [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 20 |
Mixed Use Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 4 |
Retail Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 1 |
Core Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 180 |
Assets Held-for-sale [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 6 |
Development Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 4 |
Redevelopment Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 1 |
Re-entitlement Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 1 |
Wholly Owned Properties [Member] | Parent Company [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 24.7 |

X
- Definition Area Of Additional Undeveloped Parcels Of Land With Option to Purchase + References No definition available. + Details
Name: | bdn_AreaOfAdditionalUndevelopedParcelsOfLandWithOptiontoPurchase
Namespace Prefix: | bdn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area Owned By Real Estate Venture in Parcels Of Land Under Development + References No definition available. + Details
Name: | bdn_AreaOwnedByRealEstateVentureInParcelsOfLandUnderDevelopment
Namespace Prefix: | bdn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area owned by Real estate venture of undeveloped parcels of land (in acres). + References No definition available. + Details
Name: | bdn_AreaOwnedByRealEstateVentureOfUndevelopedParcelsOfLand
Namespace Prefix: | bdn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Organization of The Parent Company and The Operating Partnership. + References No definition available. + Details
Name: | bdn_OrganizationOfParentCompanyAndOperatingPartnershipLineItems
Namespace Prefix: | bdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of development that can be supported by undeveloped land + References No definition available. + Details
Name: | bdn_TotalPotentialDevelopmentCapacity
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

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_CorporateJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=bdn_ManagementCompanySubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=bdn_ThirdPartiesAndRealEstateVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_TotalPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_OfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_IndustrialFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_MixedUsePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_RetailPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_CorePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_DevelopmentPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_RedevelopmentPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_ReEntitlementPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_WhollyOwnedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |