v3.26.1
PARTNERS' EQUITY OF THE PARENT COMPANY - Schedule of Number of Units and Net Income Used to Calculate Basic and Diluted Earnings Per Common Partnership Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator            
Net loss $ (31,535) $ (48,804) $ (88,936) $ (27,056) $ (80,339) $ (115,992)
Nonforfeitable dividends allocated to unvested restricted shareholders (248)   (322)   (566) (751)
Nonforfeitable dividends allocated to unvested restricted unitholders, diluted (248)   (322)   (566) (751)
Net loss attributable to Common Shareholders of Brandywine Realty Trust (31,658)   (88,991)   (80,567) (116,395)
Net loss attributable to common unitholders, diluted $ (31,658)   $ (88,991)   $ (80,567) $ (116,395)
Denominator            
Total weighted-average units outstanding, basic (in shares) 174,384,600   173,532,583   174,072,403 173,225,737
Total weighted-average units outstanding, diluted (in shares) 174,384,600   173,532,583   174,072,403 173,225,737
Loss per Common Partnership Unit:            
Net loss attributable to common shareholders, basic (in dollars per share) $ (0.18)   $ (0.51)   $ (0.46) $ (0.67)
Net loss attributable to common shareholders, diluted (in dollars per share) $ (0.18)   $ (0.51)   $ (0.46) $ (0.67)
Brandywine Operating Partnership, L.P.            
Numerator            
Net loss $ (31,535) $ (48,804) $ (88,936) $ (27,056) $ (80,339) $ (115,992)
Net loss attributable to noncontrolling interests 30   0   97 0
Nonforfeitable dividends allocated to unvested restricted shareholders (248)   (322)   (566) (751)
Nonforfeitable dividends allocated to unvested restricted unitholders, diluted (248)   (322)   (566) (751)
Net loss attributable to Common Shareholders of Brandywine Realty Trust (31,753)   (89,258)   (80,808) (116,743)
Net loss attributable to common unitholders, diluted $ (31,753)   $ (89,258)   $ (80,808) $ (116,743)
Denominator            
Total weighted-average units outstanding, basic (in shares) 174,900,195   174,048,178   174,587,997 173,741,332
Total weighted-average units outstanding, diluted (in shares) 174,900,195   174,048,178   174,587,997 173,741,332
Loss per Common Partnership Unit:            
Net loss attributable to common shareholders, basic (in dollars per share) $ (0.18)   $ (0.51)   $ (0.46) $ (0.67)
Net loss attributable to common shareholders, diluted (in dollars per share) $ (0.18)   $ (0.51)   $ (0.46) $ (0.67)