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Investment in Unconsolidated Ventures Notes Receivable (Details) (USD $) | 12 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Jul. 31, 2014 | Dec. 31, 2013 | Oct. 17, 2014 Real_Estate_Investments | Oct. 16, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Real Estate Investments in residential towers | 1 bdn_NumberofRealEstateInvestmentsinresidentialtowers |  |  |  |
Equity Method Investment, Summarized financial information debt | 965,077,000 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt |  |  |  |
Financing Receivable, Net | 88,000,000 us-gaap_NotesReceivableNet |  | 7,026,000 us-gaap_NotesReceivableNet |  |
Austin Joint Venture [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Short-term Debt, Terms | 4.0% through December 31, 2014, (ii) 5.0% from January 1, 2015 through January 31, 2015, (iii) 7.0% from February 1, 2015 through February 28, 2015 and (iv) 9.0% from March 1, 2015 through March 31, 2015. |  |  |  |
River Place [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Net | 88,000,000 us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_RiverPlaceMember |  |  |  |
Austin Joint Venture [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net Rentable Area |  | 232,274 us-gaap_NetRentableArea / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  |
Equity Method Investment, Summarized financial information debt | 382,100,000 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember | 34,500,000 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  |
Equity method investments, Cash contributions | 69,000,000 bdn_EquitymethodinvestmentsCashcontributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember | 12,800,000 bdn_EquitymethodinvestmentsCashcontributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  |
Equity method investments, Closing costs | 200,000 bdn_EquitymethodinvestmentsClosingcosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember | 100,000 bdn_EquitymethodinvestmentsClosingcosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  |
Equity method investments, Purchase adjustments |  | 900,000 bdn_EquitymethodinvestmentsPurchaseadjustments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  |
Equity method investments, Credit from seller |  | 600,000 bdn_EquitymethodinvestmentsCreditfromseller / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  |
Number of Real Estate Properties |  | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  | 7 us-gaap_NumberOfRealEstateProperties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |
Austin, Texas [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of floors of a building |  | 3 bdn_NumberOfFloorsOfBuilding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinTexasMember |  |  |
Secured Debt [Member] | Austin Joint Venture [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Short-term Debt, Terms | 0.05 |  |  |  |
DRA Advisors LLC [Member] | Austin Joint Venture [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Equity method investments, Closing costs |  |  |  |  | $ 1,900,000 bdn_EquitymethodinvestmentsClosingcosts / bdn_JointVentureMembersAxis = bdn_DRAAdvisorsLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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