XML 56 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Real Estate Investments - Acquisitions (Textual) (Details) $ in Thousands |  | 2 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 28, 2017 USD ($) ft² | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Revenue |  |  | $ 128,438 | $ 129,694 | $ 387,149 | $ 393,377
3000 Market Street [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition of office building from unaffiliated third party, cost | $ 32,700 |  |  |  |  |
Capitalized acquisition related cost | 700 |  |  |  |  |
Contractual sale price of real estate acquired | $ 32,000 |  |  |  |  |
Revenue |  | $ 300 |  |  |  |
3000 Market Street [Member] | Office Properties [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Area of Real Estate Property | ft² | 58,587 |  |  |  |  |

X
- Definition Acquisition costs capitalized in asset acquisition. + References No definition available. + Details
Name: | bdn_AcquisitionCostsCapitalizedInAssetAcquisition
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Contractual sale price of real estate acquired. + References No definition available. + Details
Name: | bdn_ContractualSalePriceOfRealEstateAcquired
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for acquisition of buildings (properties) whether for investment or use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBuildings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_RealEstateRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bdn_ThreeThousandMarketStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_OfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |