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Debt Obligations (Details Textuals 2) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Unsecured Debt [Member] | Four Year Term Loan [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | $ 250.0
Debt Instrument, Interest Rate, Stated Percentage | 5.40%
Unsecured Debt [Member] | $250.0M 7.500% Guaranteed Notes due 2015 |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 7.50%
Unsecured Debt [Member] | $250.0M 6.000% Guranteed Notes due 2016 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 6.00%
Unsecured Debt [Member] | $300.0M 5.700% Guaranteed Notes due 2017 |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | 300.0
Debt Instrument, Interest Rate, Stated Percentage | 5.70%
Unsecured Debt [Member] | $325.0M 4.950% Guaranteed Notes due 2018 |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | 325.0
Debt Instrument, Interest Rate, Stated Percentage | 4.95%
Unsecured Debt [Member] | $250.0M 3.950% Guaranteed Notes due 2023 |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 3.95%
Unsecured Debt [Member] | Three Year Term Loan [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | 150.0
Debt Instrument Term | 3 years
Option to Extend Term Loan | 1 year
Unsecured Debt [Member] | Four-Year Term Loan - Variable [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | 100.0
Debt Instrument Term | 4 years
Option to Extend Term Loan | 1 year
Debt Instrument, Basis Spread on Variable Rate | 1.75%
Unsecured Debt [Member] | Letter of Credit [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Basis Spread on Variable Rate | 1.50%
Unsecured Debt [Member] | Three and Four Year Term Loan [Member] |
Debt Instrument [Line Items] |
Derivative, Lower Remaining Maturity Range | 3 years
Derivative, Higher Remaining Maturity Range | 4 years
Unsecured Debt [Member] | Seven Year Term Loan [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | $ 200.0
Debt Instrument Term | 7 years
Senior notes 5.400 Percent due 2014 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 5.40%
Senior Notes Due2015 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 7.50%

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- Definition Option to Extend Term Loan + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Low end period remaining until maturity of derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeLowerRemainingMaturityRange1
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration