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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 18, 2024 $ / shares | Dec. 05, 2023 USD ($) $ / shares | Dec. 31, 2023 class_of_units $ / shares shares | Dec. 31, 2022 $ / shares shares | Dec. 31, 2021 $ / shares shares
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Number of classes of partnership units | class_of_units |  |  | 2 |  |
Amount of dividend declared | $ |  | $ 26.0 |  |  |
Repurchased and retired (in shares) | shares |  |  | 0 | 0 |
Dividends paid in cash (in dollars per share) |  |  | $ 0.72 | $ 0.76 | $ 0.76
Distributions declared (in dollars per share) |  | $ 0.15 | 0.68 | 0.76 | 0.76
Subsequent Event |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Dividends paid in cash (in dollars per share) | $ 0.15 |  |  |  |
Class A Units |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Redeemable limited partnership unit price (in dollars per share) |  |  | $ 5.40 | $ 6.15 | $ 13.42
Limited partners' capital account, units outstanding (in units) | shares |  |  | 515,595 | 516,467 | 823,983
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Preferred units, outstanding (in units) | shares |  |  | 0 | 0 |
Amount of dividend declared | $ |  | $ 26.0 |  |  |
Repurchase program, number of mirror unit of operating partnership retired for each common share repurchased | shares |  |  | 1 |  |
Distributions declared (in dollars per share) |  | $ 0.15 |  |  |
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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