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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 02, 2010
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Increased revenue due to amortization of deferred rent | $ 2.4 bdn_IncreaseInRevenueDueToAmortizationOfDeferredRent | $ 2.4 bdn_IncreaseInRevenueDueToAmortizationOfDeferredRent | $ 2.4 bdn_IncreaseInRevenueDueToAmortizationOfDeferredRent |
Decrease in revenue due to amortization of lease incentives | 1.5 bdn_DecreaseInRevenueDueToLeaseIncentives | 0.7 bdn_DecreaseInRevenueDueToLeaseIncentives | 0.8 bdn_DecreaseInRevenueDueToLeaseIncentives |
Increase in shares due to amendments in plan, shares solely available for options and share appreciation rights | 2,684,795 bdn_IncreaseInSharesDueToAmendmentsInPlanSharesSolelyAvailableForOptionsAndShareAppreciationRights |  |  | 3,600,000 bdn_IncreaseInSharesDueToAmendmentsInPlanSharesSolelyAvailableForOptionsAndShareAppreciationRights
Revenue increased by straight-line rent adjustment | 13.7 us-gaap_StraightLineRentAdjustments | 17.7 us-gaap_StraightLineRentAdjustments | 21.1 us-gaap_StraightLineRentAdjustments |
Increase in Common shares available for future awards |  |  |  | 6,000,000 bdn_IncreaseInSharesDueToAmendmentsInPlan
Common shares available for future awards | 4,304,006 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |
Options awarded, term | one to ten-year |  |  |
Stock-based compensation expense | 6.1 us-gaap_AllocatedShareBasedCompensationExpense | 8.3 us-gaap_AllocatedShareBasedCompensationExpense | 8.6 us-gaap_AllocatedShareBasedCompensationExpense |
Stock-based compensation expense, capitalized | 1.7 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | 1.4 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | 2.6 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount |
Capitalized interest | 4.8 us-gaap_InterestCostsCapitalized | 2.6 us-gaap_InterestCostsCapitalized | 2.6 us-gaap_InterestCostsCapitalized |
Concentration Risk, Percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 | 10.00%us-gaap_ConcentrationRiskPercentage1 | 10.00%us-gaap_ConcentrationRiskPercentage1 |
The Grove at Cira Centre South [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Guaranty Liabilities | 24.7 us-gaap_GuarantyLiabilities / dei_LegalEntityAxis = bdn_GroveAtCiraCentreSouthMember |  |  |
PJP VII [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Guaranty Liabilities | 0.5 us-gaap_GuarantyLiabilities / dei_LegalEntityAxis = bdn_PjpViiMember |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Guaranty Liabilities | 3.2 us-gaap_GuarantyLiabilities / dei_LegalEntityAxis = bdn_TbBdnPlymouthApartmentsMember |  |  |
Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Property, Plant and Equipment, Useful Life | 55 years 0 months 0 days |  |  |
TenantImprovementsUsefulLives | 16 years 0 months 0 days |  |  |
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Property, Plant and Equipment, Useful Life | 5 years 0 months 0 days |  |  |
TenantImprovementsUsefulLives | 1 year 0 months 0 days |  |  |
Equity Method Investments [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Capitalized interest | 2.0 us-gaap_InterestCostsCapitalized / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember | 0.6 us-gaap_InterestCostsCapitalized / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember |  |
Accounts receivable and accrued rent receivable [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Concentration Risk, Percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccountsreceivableandaccruedrentreceivableMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccountsreceivableandaccruedrentreceivableMember |  |
Accrued Rent Receivable [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Allowance for Doubtful Accounts Receivable | $ 13.4 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccruedRentReceivableMember | $ 13.0 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = bdn_AccruedRentReceivableMember |  |
Tenant relationship value [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Concentration Risk, Percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis = us-gaap_CustomerRelationshipsMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis = us-gaap_CustomerRelationshipsMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_PrincipleTransactionRevenueDescriptionOfReportingCategoryAxis = us-gaap_CustomerRelationshipsMember |

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