Partners Equity of the Operating Partnership (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator
Income (Loss) from continuing operations, Basic	$ 8,594	$ (2,237)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(101)	(103)
Preferred share/unit dividends, Basic	(1,725)us-gaap_DividendsPreferredStock	(1,725)us-gaap_DividendsPreferredStock
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures	0	(12)
Income (Loss) from continuing operations available to common unitholders, Basic	6,710	(4,033)
Loss from discontinued operations, Basic	0	(8)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	6,710	(4,041)
Income (Loss) from continuing operations, Diluted	8,594	(2,237)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(101)	(103)
Preferred share/unit dividends, Diluted	(1,725)bdn_PreferredStockDividendsDiluted	(1,725)bdn_PreferredStockDividendsDiluted
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures, Diluted	0	(12)
Income (Loss) from continuing operations available to common unitholders, Diluted	6,710	(4,033)
Net Income (Loss) Available to Common Shareholders/unitholders, Diluted	6,710	(4,041)
Denominator
Weighted-average units outstanding, Basic	179,562,930	156,794,019
Contingent securities/Share based compensation	1,092,342	0
Diluted weighted average shares outstanding	180,655,272	156,794,019
Earnings per Common Partnership Unit [Abstract]
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.04	$ (0.03)
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	$ 0.04	$ (0.03)
Discontinued operations attributable to common shareholders, Basic (USD per share)	$ 0.00	$ 0.00
Discontinued operations attributable to common shareholders, Diluted (USD per share)	$ 0.00	$ 0.00
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Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.04us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Income (Loss) from continuing operations, Basic	8,594	(2,237)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(101)	(103)
Preferred share/unit dividends, Basic	(1,725)	(1,725)
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures	0	(12)
Income (Loss) from continuing operations available to common unitholders, Basic	6,768	(4,077)
Loss from discontinued operations, Basic	0	(8)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	6,768	(4,085)
Income (Loss) from continuing operations, Diluted	8,594	(2,237)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(101)	(103)
Preferred share/unit dividends, Diluted	(1,725)	(1,725)
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures, Diluted	0	(12)
Income (Loss) from continuing operations available to common unitholders, Diluted	6,768	(4,077)
Income (Loss) From Discontinued Operations, Diluted	0	(8)
Net Income (Loss) Available to Common Shareholders/unitholders, Diluted	$ 6,768	$ (4,085)
Denominator
Weighted-average units outstanding, Basic	181,098,032	158,557,758
Contingent securities/Share based compensation	1,092,342	0
Diluted weighted average shares outstanding	182,190,374	158,557,758
Earnings per Common Partnership Unit [Abstract]
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.04	$ (0.03)
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	$ 0.04	$ (0.03)
Discontinued operations attributable to common shareholders, Basic (USD per share)	$ 0.00	$ 0.00
Discontinued operations attributable to common shareholders, Diluted (USD per share)	$ 0.00	$ 0.00
Net income (loss) attributable to common shareholders, Basic (USD per share)	$ 0.04	$ (0.03)
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.04	$ (0.03)

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