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ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP - Summary of Properties (Details) | Dec. 31, 2020 ft² property
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Real Estate Properties [Line Items] |
Number of Properties | property | 82
Area of real estate property | ft² | 13,852,464
Office properties |
Real Estate Properties [Line Items] |
Number of Properties | property | 73
Area of real estate property | ft² | 12,470,257
Mixed-use properties |
Real Estate Properties [Line Items] |
Number of Properties | property | 5
Area of real estate property | ft² | 942,334
Core Properties |
Real Estate Properties [Line Items] |
Number of Properties | property | 78
Area of real estate property | ft² | 13,412,591
Development property |
Real Estate Properties [Line Items] |
Number of Properties | property | 1
Area of real estate property | ft² | 205,803
Redevelopment properties |
Real Estate Properties [Line Items] |
Number of Properties | property | 3
Area of real estate property | ft² | 234,070

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- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_MixedUsePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_CorePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Data Type: | na
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