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Summary of Significant Accounting Policies Impairment or DIsposal of Long-Lived Assets (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant Acquisitions and Disposals [Line Items] |  |  |
Provision for impairment on assets held for sale | $ 1,765 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf | $ 0 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf | $ 0 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Gains (Losses) on Sales of Investment Real Estate | 4,901 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate | 0 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate | 0 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate
Valleybrooke Office Park [Member] |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |
Provision for impairment on assets held for sale | 1,765 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bdn_ValleybrookeOfficeParkMember |  |
Gains (Losses) on Sales of Investment Real Estate | $ 200 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = bdn_ValleybrookeOfficeParkMember |  |

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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Subparagraph d -Article 9 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228 + Details
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