XML 70 R55.htm IDEA: XBRL DOCUMENT
v3.19.1

Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Parenthetical) (Details) | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | ---
evo at Cira Centre South [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Ownership percentage | [1] | 50.00% | 50.00%
Unconsolidated Real Estate Ventures [Member] | Minimum [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Ownership percentage |  | 15.00% | 25.00%
Unconsolidated Real Estate Ventures [Member] | Maximum [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Ownership percentage |  | 70.00% | 70.00%
[1] | The Company sold its 50% ownership interest in evo at Cira Centre South Venture during the first quarter of 2018.

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |