Consolidated Statement of Partners' Equity - USD ($) $ in Thousands	Total	BRANDYWINE OPERATING PARTNERSHIP, L.P.	General Partner Capital [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series E-linked Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Partners equity [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.
Beginning Balance at Dec. 31, 2012	$ 1,773,516	$ 1,746,739	$ 1,666,341	$ 96,850	$ (15,918)	$ (16,452)	$ 21,238	$ 0
Beginning Balance, Shares at Dec. 31, 2012			143,538,733	4,000,000
Net income (loss) attributable to Brandywine Realty Trust	42,777	43,189	$ 43,189
Other comprehensive income	13,075	13,075			12,923	13,075	152
Share Issuance from/to Deferred Compensation Plan, Shares			(5,012)
Issuance of LP Units		181,289	$ 181,289
Issuance of LP Units, Shares			12,650,000
Issuance of partnership interest in real estate		946						946
Bonus share issuance	361	361	$ 361
Bonus share issuance, Shares			27,918
Conversion of LP Units to Common Shares		1,240	$ 1,240				(1,240)
Conversion of LP Units to Common Shares, Shares			81,998
Share-based compensation activity	9,438	9,437	$ 9,437
Share-based compensation activity, Shares			438,356
Adjustment of redeemable partnership units to liquidation value at period end		(778)	$ (778)
Redemption value of limited partnership units		(1,240)	(1,240)
Distribution to preferred shareholders	(6,900)	(6,900)	(6,900)
Distributions to general partnership unitholders		(92,409)	(92,409)
Ending Balance at Dec. 31, 2013	1,921,435	1,894,949	$ 1,800,530	$ 96,850	(2,995)	(3,377)	21,215	946
Ending Balance, Shares at Dec. 31, 2013			156,731,993	4,000,000
Net income (loss) attributable to Brandywine Realty Trust	6,975	6,986	$ 6,942					(44)	$ 6,898
Other comprehensive income	(1,630)	(1,630)			(1,612)	(1,630)	(18)
Deferred compensation obligation		(90)	$ (90)
Share Issuance from/to Deferred Compensation Plan, Shares			80,152
Issuance of LP Units		334,903	$ 334,903
Issuance of LP Units, Shares			21,850,000
Conversion of LP Units to Common Shares		3,614	$ 3,614				(3,614)
Conversion of LP Units to Common Shares, Shares			228,536
Share Choice Plan Issuance, Shares			(1,423)
Share-based compensation activity	6,847	6,847	$ 6,847
Share-based compensation activity, Shares			403,902
Adjustment of redeemable partnership units to liquidation value at period end		942	$ 942
Adjustment to non-controlling interest			(108)					108
Redemption value of limited partnership units		(3,614)	(3,614)
Distribution to preferred shareholders	(6,900)	(6,900)	(6,900)
Distributions to general partnership unitholders		(101,164)	(101,164)
Ending Balance at Dec. 31, 2014	2,159,326	2,134,755	$ 2,041,902	$ 96,850	(4,607)	(5,007)	18,499	1,010
Ending Balance, Shares at Dec. 31, 2014			179,293,160	4,000,000
Net income (loss) attributable to Brandywine Realty Trust	(30,401)	(30,737)	$ (30,740)					3
Other comprehensive income	(590)	(590)			(585)	(590)	(5)
Deferred compensation obligation		(2)	$ (2)
Share Issuance from/to Deferred Compensation Plan, Shares			88,146
Repurchase and retirement of LP units		(67,430)	$ (67,430)
Repurchase and retirement of LP units, Shares			(5,209,437)
Issuance of partnership interest in real estate		1,025						1,025
Bonus share issuance	$ 125	125	$ 125
Bonus share issuance, Shares			8,447
Share Choice Plan Issuance, Shares			(1,423)
Share-based compensation activity		5,097	$ 5,097
Share-based compensation activity, Shares	5,097		509,675
Adjustment of redeemable partnership units to liquidation value at period end		1,533	$ 1,533
Adjustment to non-controlling interest			6					(6)
Distribution to preferred shareholders	$ (6,900)	(6,900)	(6,900)
Distributions to general partnership unitholders		(106,899)	(106,899)
Ending Balance at Dec. 31, 2015	$ 1,952,091	$ 1,929,977	$ 1,836,692	$ 96,850	$ (5,192)	$ (5,597)	$ 18,166	$ 2,032
Ending Balance, Shares at Dec. 31, 2015			174,688,568	4,000,000