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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2004 | Dec. 31, 2014 sqft Y | Dec. 31, 2012
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Minimum remaining lease period |  | 7 bdn_MinimumRemainingLeasePeriod |
Maximum remaining lease period |  | 75 bdn_MaximumRemainingLeasePeriod |
Leased Area Of Building |  | 708,844 bdn_LeasedAreaOfBuilding |
Amount to be paid if the Company takes fee title to Two Logan Square upon foreclosure of related mortgage |  | $ 2.9 bdn_BusinessCombinationFutureExpectedLiability |
Liability related to acquisition of TRC | 0.7 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred | 1.8 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred |
Agreed holding period (not to sell) for properties acquired as part of the TRC acquisition |  | 15 years |
One Commerce Square [Member] |  |  |
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Tax guarantee obligation |  | 125.0 bdn_Taxguaranteeobligation / us-gaap_BusinessAcquisitionAxis = bdn_OneCommerceSquareMember |
Two Commerce Square [Member] |  |  |
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Tax guarantee obligation |  | 100.0 bdn_Taxguaranteeobligation / us-gaap_BusinessAcquisitionAxis = bdn_TwoCommerceSquareMember |
One and Two Commerce Square [Member] |  |  |
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 1.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember |
Historic Tax Credit Transaction [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Accretion Of Non Controlling Interest Liability |  | 1.4 bdn_AccretionOfNonControllingInterestLiability / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember | 1.3 bdn_AccretionOfNonControllingInterestLiability / bdn_TaxCreditTransactionsAxis = bdn_HistoricTaxCreditTransactionMember
New Markets Tax Credit Transaction [Member] |  |  |
Commitments and Contingencies (Textuals) [Abstract] |  |  |
Tax Credit Carryforward, Amount |  | $ 8.0 us-gaap_TaxCreditCarryforwardAmount / bdn_TaxCreditTransactionsAxis = bdn_NewMarketsTaxCreditTransactionMember |

X
- Definition Accretion of non controlling interest liability. + References No definition available. + Details
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- Definition Business Combination, Future Expected Liability + References No definition available. + Details
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- Details
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- Definition Company agreed not to sell acquired properties up to the period + References No definition available. + Details
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Balance Type: | na
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- Definition Leased area of building. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Maximum remaining lease period. + References No definition available. + Details
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- Definition Minimum remaining lease period. + References No definition available. + Details
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X
- Definition Tax guarantee obligation + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Details
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- Details
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- Details
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