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Consolidated Balance Sheets (Parenthetical) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011
Brandywine Realty Trust's equity: |  |
Preferred shares, shares authorized | 20,000,000 | 20,000,000
Common shares of Brandywine Realty Trust's beneficial interest, par value (in dollars per share) | $ 0.01 | $ 0.01
Common shares of Brandywine Realty Trust's beneficial interest, shares authorized | 200,000,000 | 200,000,000
Common shares of Brandywine Realty Trust's beneficial interest, shares issued | 143,022,150 | 142,690,755
Common shares of Brandywine Realty Trust's beneficial interest, shares outstanding | 143,022,150 | 142,690,755
Common shares in grantor trust, shares | 293,122 | 292,646
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |
Brandywine Realty Trust's equity: |  |
Redeemable Limited Partnership, units issued | 2,657,721 | 2,698,648
Redeemable Limited Partnership, units outstanding | 2,657,721 | 2,698,648
General Partners' Capital account, units issued | 143,022,150 | 142,690,755
General Partners' Capital account, units outstanding | 143,022,150 | 142,690,755
7.50% Series C Preferred Shares |  |
Brandywine Realty Trust's equity: |  |
Preferred shares, dividend rate (as a percent) | 7.50% | 7.50%
Preferred shares, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred shares, shares issued | 2,000,000 | 2,000,000
Preferred shares, shares outstanding | 2,000,000 | 2,000,000
7.375% Series D Preferred Shares |  |
Brandywine Realty Trust's equity: |  |
Preferred shares, dividend rate (as a percent) | 7.375% | 7.375%
Preferred shares, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred shares, shares issued | 2,300,000 | 2,300,000
Preferred shares, shares outstanding | 2,300,000 | 2,300,000
7.50% Series D Preferred Shares | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |
Brandywine Realty Trust's equity: |  |
Preferred shares, dividend rate (as a percent) | 7.50% | 7.50%
Preferred shares, shares issued | 2,000,000 | 2,000,000
Preferred shares, shares outstanding | 2,000,000 | 2,000,000
7.375% Series E Preferred Shares | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |
Brandywine Realty Trust's equity: |  |
Preferred shares, dividend rate (as a percent) | 7.375% | 7.375%
Preferred shares, shares issued | 2,300,000 | 2,300,000
Preferred shares, shares outstanding | 2,300,000 | 2,300,000

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