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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 18, 2024 $ / shares | Feb. 14, 2024 USD ($) $ / shares | Mar. 31, 2024 class_of_units $ / shares shares | Mar. 31, 2023 $ / shares shares | Feb. 26, 2024 shares
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Number of classes of partnership units | class_of_units |  |  | 2 |  |
Distributions declared (in dollars per share) | $ / shares |  | $ 0.15 | $ 0.15 | $ 0.19 |
Amount of dividend declared | $ |  | $ 26.3 |  |  |
Repurchased and retired (in shares) |  |  | 0 | 0 |
Executive Officer | Restricted Performance Share Units Plan |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 417,268 |  |
Executive Officer | 2/16/2023 RSPU Grant Date | Restricted Performance Share Units Plan |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 417,268 |  |
Granted (in shares) |  |  |  |  | 1,251,803
Subsequent Event |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Dividends paid in cash (in dollars per share) | $ / shares | $ 0.15 |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Distributions declared (in dollars per share) | $ / shares |  | $ 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) | $ / shares | $ 0.15 |  |  |  |

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