XML 95 R80.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Subsequent Events (Textual) (Details) - Subsequent Event [Member] | Oct. 18, 2017 USD ($) ft² property | Oct. 16, 2017 USD ($) ft² | Oct. 02, 2017 USD ($) ft² | Oct. 17, 2017 USD ($)
--- | --- | --- | --- | ---
DRA Austin Venture [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Rentable Square Feet | ft² | 1,164,496 |  |  |
Ownership percentage | 50.00% |  |  |
Number of Properties Sold | property | 5 |  |  |
Sales Price | $ 333,300,000 |  |  |
Real estate properties encumbered, mortgage debt amount |  |  |  | $ 151,000,000
Cash proceeds after the payment of share of the debt, closing costs and prorations | 86,400,000 |  |  |
Estimated gain on real estate venture transactions and equity in income of real estate ventures | $ 52,000,000 |  |  |
One Drexel Plaza and Drexel Square [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Rentable Square Feet | ft² |  | 282,709 |  |
Gross purchase value of assets |  | $ 35,000,000 |  |
Capitalized transaction costs |  | $ 2,700,000 |  |
Property improvement period |  | 24 months |  |
One Drexel Plaza and Drexel Square [Member] | Minimum [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Property improvement obligation |  | $ 8,000,000 |  |
Four Points Building 3 [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Net Rentable Square Feet | ft² |  |  | 165,000 |
Percentage of property preleased by single tenant |  |  | 100.00% |
Lease agreement term |  |  | 10 years |
Estimated cost |  |  | $ 48,200,000 |
Estimated cost for existing land basis |  |  | $ 2,100,000 |

X
- Definition Business acquisition transaction costs capitalized. + References No definition available. + Details
Name: | bdn_BusinessAcquisitionTransactionCostsCapitalized
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Equity method investment summarized financial information debt. + References No definition available. + Details
Name: | bdn_EquityMethodInvestmentSummarizedFinancialInformationDebt
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated cost of construction. + References No definition available. + Details
Name: | bdn_EstimatedCostOfConstruction
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated cost of construction for existing land basis. + References No definition available. + Details
Name: | bdn_EstimatedCostOfConstructionForExistingLandBasis
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated gain on real estate venture transactions and equity in income of real estate ventures. + References No definition available. + Details
Name: | bdn_EstimatedGainOnRealEstateVentureTransactionsAndEquityInIncomeOfRealEstateVentures
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Lease agreement term. + References No definition available. + Details
Name: | bdn_LeaseAgreementTerm
Namespace Prefix: | bdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Liability incurred for property improvements. + References No definition available. + Details
Name: | bdn_LiabilityIncurredForPropertyImprovements
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of real estate properties sold during the period. + References No definition available. + Details
Name: | bdn_NumberOfRealEstatePropertiesSold
Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payments to acquire real estate gross. + References No definition available. + Details
Name: | bdn_PaymentsToAcquireRealEstateGross
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of property preleased by single tenant. + References No definition available. + Details
Name: | bdn_PercentageOfPropertyPreleasedBySingleTenant
Namespace Prefix: | bdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Real estate property improvement period. + References No definition available. + Details
Name: | bdn_RealEstatePropertyImprovementPeriod
Namespace Prefix: | bdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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 Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net rentable area for properties owned. + References No definition available. + Details
Name: | us-gaap_NetRentableArea
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_DRAAustinVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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