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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 23, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Distributions declared (in usd per share) |  | $ 0.08 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 |  |
Repurchased and retired (in shares) |  |  |  |  |  |  |  | 0 | 0
Subsequent Event |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Amount of dividend declared | $ 14.1 |  |  |  |  |  |  |  |
Brandywine Operating Partnership, L.P. |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Distributions declared (in usd per share) |  | $ 0.08 |  |  |  |  |  |  |
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased (in shares) |  |  |  |  |  |  |  | 1 |
Brandywine Operating Partnership, L.P. | Subsequent Event |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |
Amount of dividend declared | $ 14.1 |  |  |  |  |  |  |  |

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