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v2.4.1.9

Summary of Significant Accounting Policies (Notes 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
Capitalized interest | $ 4,800,000 us-gaap_InterestCostsCapitalized | $ 2,600,000 us-gaap_InterestCostsCapitalized | $ 2,600,000 us-gaap_InterestCostsCapitalized
Interest Income | 3,974,000 us-gaap_InterestIncomeOther | 1,044,000 us-gaap_InterestIncomeOther | 3,008,000 us-gaap_InterestIncomeOther
Notes receivable | 88,000,000 us-gaap_NotesReceivableNet | 7,026,000 us-gaap_NotesReceivableNet |
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 |
River Place [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Income | 700,000 us-gaap_InterestIncomeOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_RiverPlaceMember |  |
Notes receivable | 88,000,000 us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_RiverPlaceMember |  |
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 |
20 Year Amortization Period [Member] | Purchase money mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Notes receivable |  | 7,000,000 us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_PurchaseMoneyMortgageMember / bdn_NotesReceivableByMaturityAxis = bdn_TwentyYearAmortizationPeriodMember |
Mortgage Loans on Real Estate, Interest Rate |  | 8.50%us-gaap_MortgageLoansOnRealEstateInterestRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_PurchaseMoneyMortgageMember / bdn_NotesReceivableByMaturityAxis = bdn_TwentyYearAmortizationPeriodMember |
Notes Receivable Amortization Period, Years | 20 years | 20 years |
20 Year Amortization Period [Member] | Accrued interest received [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Income | 1,500,000 us-gaap_InterestIncomeOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccruedinterestreceivedMember / bdn_NotesReceivableByMaturityAxis = bdn_TwentyYearAmortizationPeriodMember |  |
Trenton Properties [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Income | 1,000,000 us-gaap_InterestIncomeOther / us-gaap_RealEstatePropertiesAxis = bdn_TrentonPropertiesMember |  |
Number of properties sold |  |  | 2 bdn_NumberOfPropertiesSold / us-gaap_RealEstatePropertiesAxis = bdn_TrentonPropertiesMember
Gross deferred gain on sale of properties |  |  | 12,900,000 us-gaap_DeferredGainOnSaleOfProperty / us-gaap_RealEstatePropertiesAxis = bdn_TrentonPropertiesMember
Equity Method Investments [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Capitalized interest | $ 2,000,000 us-gaap_InterestCostsCapitalized / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember | $ 600,000 us-gaap_InterestCostsCapitalized / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember |

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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 Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + 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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- 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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