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v2.4.1.9

Real Estate Investments Real Estate Investments, Business Combinations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 19, 2013
One and Two Commerce Square [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | $ 255,705 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 85,036 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | 8,637 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 332,104 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  | 238,082 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Business Combination, return of capital on equity method investment |  | (30,424)bdn_BusinessCombinationreturnofcapitalonequitymethodinvestment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  | 10,423 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  | (946)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Business Combination, Total Cash Payment at Settlement |  | 73,075 bdn_BusinessCombinationTotalCashPaymentatSettlement / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Leases, Acquired-in-Place [Member] | One and Two Commerce Square [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 80,916 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Above Market Leases [Member] | One and Two Commerce Square [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 4,120 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years 10 months 24 days |
Below Market Lease [Member] | One and Two Commerce Square [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ (8,637)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdn_BelowMarketLeaseMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = bdn_OneandTwoCommerceSquareMember
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years 6 months |
One and Two Commerce Square [Member] | Leases, Acquired-in-Place [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years 10 months 24 days |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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