XML 30 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Organization of The Parent Company and The Operating Partnership (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2011 managementcompanies A | Mar. 31, 2011 | Dec. 31, 2011 Parent Company [Member] sqft A | Dec. 31, 2011 Unconsolidated real estate ventures [Member] sqft Real_Estate_Investments | Dec. 31, 2011 Wholly-owned management company subsidiaries [Member] sqft | Dec. 31, 2011 Third Parties and Unconsolidated Real Estate Ventures [Member] sqft | Dec. 31, 2011 Office Properties [Member] Properties | Dec. 31, 2011 Industrial facilities [Member] Properties | Dec. 31, 2011 Mixed-use properties [Member] Properties
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |  |  |  |  |  |  |  |  |
Ownership in the Operating Partnership | 98.10% |  |  |  |  |  |  |  |
Number of unconsolidated real estate ventures |  |  |  | 18 |  |  |  |  |
Number of properties with ownership interest |  | 3 |  |  |  |  | 207 | 20 | 5
Net rentable square feet |  |  | 25,200,000 | 6,700,000 | 32,600,000 | 7,400,000 |  |  |
Number of Third-party real estate management services businesses that conduct business with Company | 6 |  |  |  |  |  |  |  |
Ownership in Management Companies, directly and indirectly |  |  |  |  | 100.00% |  |  |  |
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture | 4 |  | 444 |  |  |  |  |  |
Area of additional undeveloped parcels of land with option to purchase |  |  | 52 |  |  |  |  |  |

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: | xbrli:integerItemType
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: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Third-party real estate management services businesses that conduct business with Parent + References No definition available. + Details
Name: | bdn_NumberOfThirdPartyRealEstateManagementServicesBusinessesThatConductBusinessWithParent
Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
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
- Details
Name: | bdn_OrganizationOfParentCompanyAndOperatingPartnershipTextualsAbstract
Namespace Prefix: | bdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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
- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
Name: | us-gaap_SquareFootageOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 22 -Article 12 + Details
Name: | us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration