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Basis of Presentation (Textual) (Details) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 15, 2017 USD ($) ft² | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2019 USD ($) Acquisition Ground $ / shares | Jun. 30, 2018 USD ($) $ / shares | Jan. 15, 2024 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of acquisitions for which adjustments have been made to correct errors related to of purchase price allocation | Acquisition |  |  |  |  |  | 2 |  |  |  |  |
Net income attributable to Brandywine Realty Trust |  | $ 6,205,000 |  |  | $ 12,747,000 | $ 10,728,000 |  | $ 56,817,000 |  |  |
Diluted income per Common Share | $ / shares |  | $ 0.03 |  |  | $ 0.07 | $ 0.06 |  | $ 0.31 |  |  |
Basic income per Common Share | $ / shares |  | $ 0.03 |  |  | $ 0.07 | $ 0.06 |  | $ 0.32 |  |  |
Direct financing leases |  | $ 0 |  |  |  | $ 0 |  |  |  |  |
Operating leases expiration dates extending |  |  |  |  |  | The operating leases have various expiration dates. |  |  |  |  |
Cumulative effect of accounting change |  |  |  | $ (5,336,000) |  |  |  |  |  |  |
Number of long-term ground leases | Ground |  |  |  |  |  | 6 |  |  |  |  |
Right of use asset - operating leases |  | 22,001,000 | [1] |  |  | $ 22,001,000 | [1] |  |  | $ 22,400,000 | $ 0
Lease liability - operating leases |  | $ 22,453,000 |  |  |  | 22,453,000 |  |  |  | $ 22,400,000 | $ 0
Proceeds from the sale of properties |  |  |  |  |  | 5,523,000 |  | $ 16,771,000 |  |  |
Philadelphia Marine Center (Marine Piers) [Member] |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² | 181,900 |  |  |  |  |  |  |  |  |  |
Sales Price | $ 21,400,000 |  |  |  |  |  |  |  |  |  |
Payment by cash on purchases | 12,000,000.0 |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of properties | 11,200,000 |  |  |  |  |  |  |  |  |  |
Balance payment on purchase price | $ 9,400,000 |  |  |  |  |  |  |  | $ 9,400,000 |  |
Date of second installment payment | Jan. 31, 2020 |  |  |  |  |  |  |  |  |  |
Uncollectible Leases [Member] |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change |  |  |  |  |  | $ (700,000) |  |  |  |  |
Error Corrections and Prior Period Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Brandywine Realty Trust |  |  |  | $ 517,000 | $ (260,000) |  |  | $ (520,000) |  |  |
Diluted income per Common Share | $ / shares |  |  |  |  |  |  |  | $ (0.01) |  |  |
Basic income per Common Share | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |
Reversal of Out of Period Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Brandywine Realty Trust |  |  |  | $ 777,000 |  |  |  |  |  |  |
Reversal of Out of Period Adjustment Offset [Member] |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Brandywine Realty Trust |  |  |  | $ (260,000) |  |  |  |  |  |  |
[1] | On January 1, 2019, as a result of the adoption of Topic 842, Leases, the Company recognized operating ground leases for which it is a lessee on its consolidated balance sheets for the period ended March 31, 2019. See Note 2, “Basis of Presentation,” for further information.

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