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Beneficiaries Equity of The Parent Company (DetailsTextuals) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 10, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 15, 2015 | Jan. 06, 2015 | Nov. 05, 2013 | Dec. 09, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  |  | $ 103,448 us-gaap_StockRedeemedOrCalledDuringPeriodValue |  |  |  |
Net proceeds from issuance of preferred shares |  | 0 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock | 0 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock | 96,237 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |
Distributions Declared, Per Share |  | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |
Preferred Stock, Shares Issued |  | 4,000,000 us-gaap_PreferredStockSharesIssued | 4,000,000 us-gaap_PreferredStockSharesIssued |  |  |  |  |
Issuance of Common Shares of Beneficial Interest, shares | 12,650,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 21,850,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest |  | 335,398 us-gaap_StockIssuedDuringPeriodValueNewIssues | 182,034 us-gaap_StockIssuedDuringPeriodValueNewIssues | 96,850 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |
Additional shares Expected to be purchased under program |  | 539,200 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  |  |
Dividends paid for preferred shares |  | 6,900 us-gaap_DividendsPreferredStockCash | 6,900 us-gaap_DividendsPreferredStockCash | 10,405 us-gaap_DividendsPreferredStockCash |  |  |  |
Additional shares granted under option to purchase in public offering | 1,650,000 bdn_AdditionalSharesGrantedUnderOptionToPurchaseInPublicOffering |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | 181,500 us-gaap_ProceedsFromIssuanceOfCommonStock | 335,016 us-gaap_ProceedsFromIssuanceOfCommonStock | 181,527 us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |
Percentage of Preferential return |  | 6.90%us-gaap_PreferredStockDividendRatePercentage | 6.90%us-gaap_PreferredStockDividendRatePercentage |  |  |  |  |
Dividends Payable, Amount |  | 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent | 25,584 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |  |  |
Preferred share/unit redemption charge |  | 0 us-gaap_RedemptionPremium | 0 us-gaap_RedemptionPremium | (4,052)us-gaap_RedemptionPremium |  |  |  |
Dividend Paid |  |  |  |  |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |
Dividends Payable, Amount |  |  |  |  |  | 27,200 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_SubsequentEventTypeAxis = us-gaap_DividendPaidMember |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |
Percentage of Preferential return |  | 6.90%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  |  |  |  |
Series E Preferred Stock [Member] | Dividend Paid |  |  |  |  |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |
Dividends paid for preferred shares |  |  |  |  | 1,700 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_DividendPaidMember |  |  |
Class A Units [Member] |  |  |  |  |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  | 1,535,102 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = bdn_ClassUnitsMember | 1,763,739 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = bdn_ClassUnitsMember | 1,845,737 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = bdn_ClassUnitsMember |  |  |  |
Offering Program [Member] |  |  |  |  |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |
Shares authorized for Equity Offering Program |  |  |  |  |  |  | 16,000,000 bdn_SharesAuthorizedForEquityOfferingProgram / us-gaap_StatementClassOfStockAxis = bdn_OfferingProgramMember |
Remaining shares available for sales |  | 16,000,000 bdn_RemainingSharesAvailableForSales / us-gaap_StatementClassOfStockAxis = bdn_OfferingProgramMember |  |  |  |  |  |
Subsidiaries [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Net proceeds from issuance of preferred shares |  | 0 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 96,237 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 4,000,000 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 4,000,000 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |
Proceeds from Issuance of Common Stock |  | 335,016 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 181,527 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |
Percentage of Preferential return |  | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |
Dividends Payable, Amount |  | 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 25,584 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |
Preferred share/unit redemption charge |  | $ 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (4,052)us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |
Dividend Declared [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |
Beneficiaries Equity of The Parent Company (Textuals) [Abstract] |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  |  |  | $ 0.15 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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