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Beneficiaries Equity of The Parent Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, Basic |  |  |  |  |  |  |  |  |  |  |  |  | $ (13,232) | $ (31,276) | $ 3,588
Income (loss) from continuing operations, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | (13,232) | (31,276) | 3,588
Net (loss) income from continuing operations attributable to non-controlling interests, Basic |  |  |  |  |  |  |  |  |  |  |  |  | 548 | 820 | 58
Net (loss) income from continuing operations attributable to non-controlling interests, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | 548 | 820 | 58
Amount allocated to unvested restricted shareholders/unitholders, Basic |  |  |  |  |  |  |  |  |  |  |  |  | (505) | (512) | (279)
Amount allocable to unvested restricted shareholders, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | (505) | (512) | (279)
Preferred share dividends, Basic |  |  |  |  |  |  |  |  |  |  |  |  | (7,992) | (7,992) | (7,992)
Preferred share dividends, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | (7,992) | (7,992) | (7,992)
Loss from continuing operations available to common shareholders, Basic |  |  |  |  |  |  |  |  |  |  |  |  | (21,181) | (38,960) | (4,625)
Loss from continuing operations available to common shareholders, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | (21,181) | (38,960) | (4,625)
Income from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | 8,517 | 13,670 | 4,501
Income from discontinued operations, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | 8,517 | 13,670 | 4,501
Discontinued operations attributable to non-controlling interests - LP units |  |  |  |  |  |  |  |  |  |  |  |  | (332) | (288) | (91)
Net income (loss) attributable to noncontrolling interest, joint venture partners and income (loss) from discontinued operations, net of tax, attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (121)
Discontinued operations attributable to non-controlling interests, diluted |  |  |  |  |  |  |  |  |  |  |  |  | (332) | (288) | (121)
Discontinued operations attributable to common shareholders, Basic |  |  |  |  |  |  |  |  |  |  |  |  | 8,185 | 13,382 | 4,380
Discontinued operations attributable to common shareholders, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | 8,185 | 13,382 | 4,380
Net loss attributable to Common Shareholders of Brandywine Realty Trust |  |  |  |  |  |  |  |  |  |  |  |  | (12,996) | (25,578) | (245)
Net loss available to common shareholders, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ (12,996) | $ (25,578) | $ (245)
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 135,444,424 | 131,743,275 | 111,898,045
Contingent securities/Stock based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,353,246
Weighted-average shares/units outstanding, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | 135,444,424 | 131,743,275 | 113,251,291
Earnings (loss) per Common Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations attributable to common shareholders/unitholders, Basic |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.16) | $ (0.29) | $ (0.04)
Loss from continuing operations attributable to common shareholders/unitholders, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.16) | $ (0.29) | $ (0.04)
Discontinued operations attributable to common shareholders, Basic |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.06 | $ 0.10 | $ 0.04
Discontinued operations attributable to common shareholders, Diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.06 | $ 0.10 | $ 0.04
Net loss attributable to common shareholders/unitholders, Basic | $ (0.05) | $ 0.03 | $ (0.06) | [1] | $ (0.02) | [2] | $ (0.05) | $ (0.06) | $ (0.06) | [1] | $ (0.02) | [2] | $ (0.10) | $ (0.19) | $ 0.00
Net loss attributable to common shareholders/unitholders, Diluted | $ (0.05) | $ 0.03 | $ (0.06) | [1] | $ (0.02) | [2] | $ (0.05) | $ (0.06) | $ (0.06) | [1] | $ (0.02) | [2] | $ (0.10) | $ (0.19) | $ 0.00
[1] | The consolidated statement of operations for the second quarter of 2011 also contained an out of period depreciation and amortization expense adjustment of $4.7 million relating to intangible assets representing tenant relationships and in-place leases that should have been written off in prior periods. This resulted in the overstatement of depreciation and amortization expense by $4.7 million million in the current year. During the year ended December 31, 2010, depreciation and amortization expense was overstated by $1.7 million and was understated by $1.4 million, $1.8 million, $1.7 million and $1.5 million during the years ended December 31, 2009, 2008, 2007, and 2006, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error in the current year is not material to the Company's consolidated financial statements, the Company recorded the related adjustment during the current year.
[2] | During the first quarter of 2011, the Company recorded additional income of $0.5 million related to electricity charges in prior years that were under-billed to a certain tenant. This resulted in the overstatement of total revenue by $0.5 million during the current year and in the understatement of total revenue by $0.3 million and $0.2 million for the years ended December 31, 2009 and 2008, respectively. As management believes that this error was not material to prior years' consolidated financial statements and that the impact of recording the error in the current year is not material to the Company's consolidated financial statements, the Company recorded the related adjustment in the current year.

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- Definition The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 7 -Paragraph 18 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 20 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8, 9, 10, 36, 37, 38 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 + Details
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