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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. 24, 2024 | Sep. 25, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Distributions declared (in dollars per share) |  |  | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.19 | $ 0.19 |  |
Amount of dividend declared |  | $ 26.3 |  |  |  |  |  |  |  |
Repurchased and retired (in shares) |  |  |  |  |  |  |  |  | 0 | 0
Subsequent Event |  |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends paid in cash (in dollars per share) | $ 0.15 |  |  |  |  |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Distributions declared (in dollars per share) |  |  | $ 0.15 |  |  |  |  |  |  |
Amount of dividend declared |  | $ 0.1 |  |  |  |  |  |  |  |
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased |  |  |  |  |  |  |  |  | 1 |
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Subsequent Event |  |  |  |  |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends paid in cash (in dollars per share) | $ 0.15 |  |  |  |  |  |  |  |  |

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