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Tax Credit Transactions (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 17, 2008 sqft | Aug. 27, 2010
Tax Credit Transactions (Textuals) [Abstract] |  |  |  |  |
Historic tax credit transaction income | $ 11,853,000 us-gaap_IncomeTaxCreditsAndAdjustments | $ 11,853,000 us-gaap_IncomeTaxCreditsAndAdjustments | $ 11,840,000 us-gaap_IncomeTaxCreditsAndAdjustments |  |
Deferred transaction costs | 125,224,000 us-gaap_DeferredCosts | 122,954,000 us-gaap_DeferredCosts |  |  |
Historic Tax Credit Transaction [Member] |  |  |  |  |
Tax Credit Transactions (Textuals) [Abstract] |  |  |  |  |
Area of IRS Philadelphia Campus building (in square foot) |  |  |  | 862,692 bdn_AreaOfIrsCampusBuilding / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |
Percentage of building leased to IRS |  |  |  | 100.00%bdn_PercentageOfBuildingLeasedToIrs / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |
Percentage of tax credit recapture | 20.00%bdn_PercentageOfTaxCreditRecapture / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |  |  |
Contribution allocated in non controlling interest | 3,000,000 bdn_ContributionAllocatedInNonControllingInterest / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember | 2,800,000 bdn_ContributionAllocatedInNonControllingInterest / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |  |
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period | over the five year credit recapture period as defined in the Internal Revenue Code |  |  |  |
Historic tax credit transaction income | 11,900,000 us-gaap_IncomeTaxCreditsAndAdjustments / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember | (11,900,000)us-gaap_IncomeTaxCreditsAndAdjustments / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |  |
Allocated expenses within other income (expense) | 500,000 us-gaap_OtherNonoperatingIncomeExpense / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |  |  |
Deferred transaction costs | 500,000 us-gaap_DeferredCosts / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember | 1,000,000 us-gaap_DeferredCosts / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |  |
Rate of return on noncontrolling interest expected | 2.00%bdn_RateOfReturnOnNoncontrollingInterest / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |  |  |
Accretion of non-controlling interest liability | (1,400,000)bdn_AccretionOfNonControllingInterestLiability / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  | (1,300,000)bdn_AccretionOfNonControllingInterestLiability / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period in years | 5 years |  |  |  |
New Markets Tax Credit Transaction [Member] |  |  |  |  |
Tax Credit Transactions (Textuals) [Abstract] |  |  |  |  |
Percentage of tax credit recapture | 100.00%bdn_PercentageOfTaxCreditRecapture / bdn_TaxCreditTransactionsAxis = bdn_NewMarketsTaxCreditTransactionMember |  |  |  |
Percentage of qualified investments | 39.00%bdn_PercentageOfQualifiedInvestments / bdn_TaxCreditTransactionsAxis = bdn_NewMarketsTaxCreditTransactionMember |  |  |  |
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period in years | 7 years |  |  |  |
Brandywine Realty Trust [Member] | New Markets Tax Credit Transaction [Member] |  |  |  |  |
Tax Credit Transactions (Textuals) [Abstract] |  |  |  |  |
Deferred transaction costs | 5,300,000 us-gaap_DeferredCosts / dei_LegalEntityAxis = bdn_BrandywineRealtyTrustMember / bdn_TaxCreditTransactionsAxis = bdn_NewMarketsTaxCreditTransactionMember | 5,300,000 us-gaap_DeferredCosts / dei_LegalEntityAxis = bdn_BrandywineRealtyTrustMember / bdn_TaxCreditTransactionsAxis = bdn_NewMarketsTaxCreditTransactionMember |  |  |
USB [Member] | Historic Tax Credit Transaction [Member] |  |  |  |  |
Tax Credit Transactions (Textuals) [Abstract] |  |  |  |  |
Agreed contribution in project cost by USB |  |  |  |  | 64,100,000 bdn_AgreedContributionInProjectCost / dei_LegalEntityAxis = bdn_USBMember / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember
USB contributions presented within deferred income | 15,100,000 us-gaap_DeferredRevenue / dei_LegalEntityAxis = bdn_USBMember / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember | 26,800,000 us-gaap_DeferredRevenue / dei_LegalEntityAxis = bdn_USBMember / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |  |
Allocated expenses within other income (expense) |  | (500,000)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = bdn_USBMember / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember |  |  |
USB [Member] | New Markets Tax Credit Transaction [Member] |  |  |  |  |
Tax Credit Transactions (Textuals) [Abstract] |  |  |  |  |
USB contributions presented within deferred income | $ 13,300,000 us-gaap_DeferredRevenue / dei_LegalEntityAxis = bdn_USBMember / bdn_TaxCreditTransactionsAxis = bdn_NewMarketsTaxCreditTransactionMember |  |  |  |

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