Beneficiaries Equity of the Parent Company (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)
Income (Loss) from continuing operations, Diluted	8,594	(2,237)
Net (income) loss from continuing operations attributable to non-controlling interests - LP units	(58)	44
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures	0	(12)
Net loss attributable to non-controlling interest — partners' share of consolidated real estate ventures, Diluted	0	(12)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(101)	(103)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(101)	(103)
Preferred share/unit dividends, Basic	(1,725)us-gaap_DividendsPreferredStock	(1,725)us-gaap_DividendsPreferredStock
Preferred share/unit dividends, Diluted	(1,725)bdn_PreferredStockDividendsDiluted	(1,725)bdn_PreferredStockDividendsDiluted
Income (Loss) from continuing operations available to common unitholders, Basic	6,710	(4,033)
Income (Loss) from continuing operations available to common unitholders, Diluted	6,710	(4,033)
Loss from discontinued operations, Basic	0	(8)
Loss from discontinued operations, Diluted	0	(8)
Discontinued operations attributable to common shareholders, Basic	0	(8)
Discontinued operations attributable to common shareholders, Diluted	0	(8)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	6,710	(4,041)
Net Income (Loss) Available to Common Shareholders/unitholders, Diluted	$ 6,710	$ (4,041)
Denominator
Basic weighted average shares outstanding	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 share from continuing operations Abstract
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.04	$ (0.03)
Discontinued operations attributable to common shareholders, Basic (USD per share)	$ 0.00	$ 0.00
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Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	$ 0.04	$ (0.03)
Discontinued operations attributable to common shareholders, Diluted (USD per share)	$ 0.00	$ 0.00
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.04us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted

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