XML 57 R42.htm IDEA: XBRL DOCUMENT
v3.20.2

Real Estate Investments - Summary of Properties Acquired (Details) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Feb. 27, 2020 USD ($) a | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Real Estate [Line Items] |  |  |
Purchase price |  | $ 11,432 | $ 0
Land | 145 King of Prussia Road |  |  |
Real Estate [Line Items] |  |  |
Area of land (in acres) | a | 7.75 |  |
Purchase price | $ 11,250 |  |

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_RealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_A145155KingofPrussiaRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |