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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 23, 2025 USD ($) | Dec. 31, 2024 $ / shares shares | Dec. 31, 2024 class $ / shares shares | Dec. 31, 2023 $ / shares shares | Dec. 31, 2022 $ / shares shares
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Number of classes of partnership units | class |  |  | 2 |  |
Distributions declared (in dollars per share) | $ / shares |  | $ 0.15 | $ 0.60 | $ 0.68 | $ 0.76
Repurchased and retired (in shares) |  |  | 0 | 0 |
Subsequent Event |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Amount of dividend declared | $ | $ 26.3 |  |  |  |
Class A Units |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Redeemable limited partnership unit price (in dollars per share) | $ / shares |  | $ 5.60 | $ 5.60 | $ 5.40 | $ 6.15
Limited partners' capital account, units outstanding (in units) |  | 515,595 | 515,595 | 515,595 | 516,467
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Preferred units, outstanding (in units) |  | 0 | 0 | 0 |
Distributions declared (in dollars per share) | $ / shares |  | $ 0.15 |  |  |
Repurchase program, number 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] |  |  |  |  |
Amount of dividend declared | $ | $ 26.3 |  |  |  |

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