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Investment in Unconsolidated Ventures Aggregate Principal Payments of Recourse and Non-recourse Debt Payable to Third-parties (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 31, 2014
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |
Loss on real estate venture formation | $ 0 bdn_LossOnRealEstateVentureFormation | $ 0 bdn_LossOnRealEstateVentureFormation | $ (950)bdn_LossOnRealEstateVentureFormation |
Schedule of Equity Method Investments [Line Items] |  |  |  |
2015 | 102,030 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |
2016 | 367,703 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |
2017 | 330,323 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |
2018 | 336,954 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |
2019 | 213,155 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |
Thereafter | 1,109,298 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |
Equity Method Investment Summarized Financial Information Debt | 965,077 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt |  |  |
Brandywine Nineteen Nineteen Ventures [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment Summarized Financial Information Debt | 0 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_BrandywineNineteenNineteenVenturesMember |  |  |
Austin Joint Venture [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment Summarized Financial Information Debt | 382,100 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  | 34,500 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember
Equity Method Investments [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
2015 | 279,351 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
2016 | 133,809 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
2017 | 44,465 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
2018 | 231,030 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
2019 | 182,522 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
Thereafter | 93,900 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
Equity Method Investment Summarized Financial Information Debt | 965,077 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvestmentsMember |  |  |
Seven Tower Bridge [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment Summarized Financial Information Debt | 14,865 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_SevenTowerBridgeMember |  |  |
Fixed Rate Loan Maturing February 2016 [Member] | Secured Debt [Member] | Seven Tower Bridge [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment Summarized Financial Information Debt | 2,000 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_DebtInstrumentAxis = bdn_FixedRateLoanMaturingFebruary2016Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_SevenTowerBridgeMember |  |  |
Fixed Rate Loan Maturing March 2020 [Member] | Secured Debt [Member] | Seven Tower Bridge [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment Summarized Financial Information Debt | $ 3,900 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_DebtInstrumentAxis = bdn_FixedRateLoanMaturingMarch2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_SevenTowerBridgeMember |  |  |

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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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