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v2.4.1.9

Summary of Significant Accounting Policies Accounts Receivable and Accrued Rent Receivable (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 | 10.00%us-gaap_ConcentrationRiskPercentage1 | 10.00%us-gaap_ConcentrationRiskPercentage1
Straight Line Rent Adjustments | $ (13,700,000)us-gaap_StraightLineRentAdjustments | $ (17,700,000)us-gaap_StraightLineRentAdjustments | $ (21,100,000)us-gaap_StraightLineRentAdjustments
Proceeds from repayment of mortgage notes receivable | 7,026,000 us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable | 200,000 us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable | 23,364,000 us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable
Accounts receivable and accrued rent receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccountsreceivableandaccruedrentreceivableMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccountsreceivableandaccruedrentreceivableMember |
Tenant Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for Doubtful Accounts Receivable | 2,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_TenantReceivableMember | 3,200,000 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_TenantReceivableMember |
Accrued Rent Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for Doubtful Accounts Receivable | 13,400,000 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccruedRentReceivableMember | 13,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccruedRentReceivableMember |
20 Year Amortization Period [Member] | Purchase money mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Notes Receivable Amortization Period, Years | 20 years | 20 years |
Mortgage Loans on Real Estate, Interest Rate |  | 8.50%us-gaap_MortgageLoansOnRealEstateInterestRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_PurchaseMoneyMortgageMember / bdn_NotesReceivableByMaturityAxis = bdn_TwentyYearAmortizationPeriodMember |
Notes Receivable Due Two Thousand Sixteen [Member] | Purchase money mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from repayment of mortgage notes receivable |  |  | 23,500,000 us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_PurchaseMoneyMortgageMember / bdn_NotesReceivableByMaturityAxis = bdn_NotesReceivableDueTwoThousandSixteenMember
Trenton Properties [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Deferred Gain on Sale of Property |  |  | $ 12,900,000 us-gaap_DeferredGainOnSaleOfProperty / us-gaap_RealEstatePropertiesAxis = bdn_TrentonPropertiesMember

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.U.Q2) -URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791 + Details
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- Definition The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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