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Schedule III - Real Estate and Accumulated Depreciation (Reconciliation of Real Estate and Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |
Balance at the Beginning of the Year | $ 4,669,289 us-gaap_RealEstateGrossAtCarryingValue |  | $ 4,726,169 us-gaap_RealEstateGrossAtCarryingValue |  | $ 4,793,080 us-gaap_RealEstateGrossAtCarryingValue
Additions: |  |  |  |  |
Acquisitions | 0 us-gaap_RealEstateOtherAcquisitions |  | 347,510 us-gaap_RealEstateOtherAcquisitions |  | 50,579 us-gaap_RealEstateOtherAcquisitions
Capital Expenditures | 132,149 us-gaap_RealEstateImprovements |  | 109,740 us-gaap_RealEstateImprovements |  | 90,619 us-gaap_RealEstateImprovements
Less: |  |  |  |  |
Dispositions | (126,471)us-gaap_RealEstateCostOfRealEstateSold |  | (474,275)us-gaap_RealEstateCostOfRealEstateSold |  | (168,408)us-gaap_RealEstateCostOfRealEstateSold
SEC Schedule III, Real Estate, Other Deductions | (43,839)us-gaap_RealEstateOtherDeductions |  | (39,855)us-gaap_RealEstateOtherDeductions |  | (39,701)us-gaap_RealEstateOtherDeductions
Balance at the End of the Year | 4,631,128 us-gaap_RealEstateGrossAtCarryingValue |  | 4,669,289 us-gaap_RealEstateGrossAtCarryingValue |  | 4,726,169 us-gaap_RealEstateGrossAtCarryingValue
Real Estate Held-for-sale | 27,436 us-gaap_RealEstateHeldforsale | [1] | 0 us-gaap_RealEstateHeldforsale | [1] | 0 us-gaap_RealEstateHeldforsale
Operating properties | 4,603,692 us-gaap_RealEstateInvestmentPropertyAtCost |  | 4,669,289 us-gaap_RealEstateInvestmentPropertyAtCost |  | 4,726,169 us-gaap_RealEstateInvestmentPropertyAtCost
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |
Balance at the beginning of the year | 983,808 us-gaap_RealEstateAccumulatedDepreciation |  | 954,665 us-gaap_RealEstateAccumulatedDepreciation |  | 865,710 us-gaap_RealEstateAccumulatedDepreciation
Real Estate Accumulated Depreciation Additions [Abstract] |  |  |  |  |
Depreciation expense — continuing operations | 160,641 bdn_RealEstateAccumulatedDepreciationDepreciationExpenseContinuingOperations |  | 150,236 bdn_RealEstateAccumulatedDepreciationDepreciationExpenseContinuingOperations |  | 154,095 bdn_RealEstateAccumulatedDepreciationDepreciationExpenseContinuingOperations
Depreciation expense — discontinued operations | 0 bdn_RealEstateAccumulatedDepreciationDepreciationExpenseDiscontinuedOperations |  | 9,164 bdn_RealEstateAccumulatedDepreciationDepreciationExpenseDiscontinuedOperations |  | 2,143 bdn_RealEstateAccumulatedDepreciationDepreciationExpenseDiscontinuedOperations
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |  |
Dispositions | (22,459)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold |  | (91,890)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold |  | (28,270)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
SEC Schedule III, Real Estate Accumulated Depreciation, Other Deductions | (42,994)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions |  | (38,367)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions |  | (39,013)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions
Balance at the end of the year | 1,078,996 us-gaap_RealEstateAccumulatedDepreciation |  | 983,808 us-gaap_RealEstateAccumulatedDepreciation |  | 954,665 us-gaap_RealEstateAccumulatedDepreciation
SchIIIRealEstateAccumulatedDepreciationAssetsHeldForSale | (11,167)bdn_SchIIIRealEstateAccumulatedDepreciationAssetsHeldForSale |  | 0 bdn_SchIIIRealEstateAccumulatedDepreciationAssetsHeldForSale |  | 0 bdn_SchIIIRealEstateAccumulatedDepreciationAssetsHeldForSale
Real Estate Investment Property, Accumulated Depreciation | 1,067,829 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation |  | 983,808 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation |  |
Accumulated Depreciation, including HFS [Member] |  |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |  |
Real Estate Investment Property, Accumulated Depreciation | $ 1,067,829 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_FairValueByAssetClassAxis = bdn_AccumulatedDepreciationincludingHFSMember |  | $ 983,808 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_FairValueByAssetClassAxis = bdn_AccumulatedDepreciationincludingHFSMember |  | $ 954,665 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_FairValueByAssetClassAxis = bdn_AccumulatedDepreciationincludingHFSMember
[1] | (a)Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale.

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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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- Definition Amount of other deductions to accumulated depreciation, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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- Definition Amount of decrease to accumulated depreciation for real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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- Definition Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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