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Consolidated Balance Sheets (Parenthetical) (USD $) |  |  |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2010 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2011 7.50% Series C Preferred Shares | Dec. 31, 2010 7.50% Series C Preferred Shares | Dec. 31, 2011 7.375% Series D Preferred Shares | Dec. 31, 2010 7.375% Series D Preferred Shares | Dec. 30, 2003 7.50% Series D Preferred Shares BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2011 7.50% Series D Preferred Shares BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2010 7.50% Series D Preferred Shares BRANDYWINE OPERATING PARTNERSHIP, L.P. | Feb. 27, 2004 7.375% Series E Preferred Shares BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2011 7.375% Series E Preferred Shares BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2010 7.375% Series E Preferred Shares BRANDYWINE OPERATING PARTNERSHIP, L.P.
Brandywine Realty Trust's equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividend rate |  |  |  |  | 7.50% | 7.50% | 7.375% | 7.375% | 7.50% | 7.50% | 7.50% | 7.375% | 7.375% | 7.375%
Preferred shares, par value |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |  |
Preferred shares, shares authorized | 20,000,000 | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, shares issued |  |  |  |  | 2,000,000 | 2,000,000 | 2,300,000 | 2,300,000 | 2,000,000 | 2,000,000 | 2,000,000 | 2,300,000 | 2,300,000 | 2,300,000
Preferred shares, shares outstanding |  |  |  |  | 2,000,000 | 2,000,000 | 2,300,000 | 2,300,000 |  | 2,000,000 | 2,000,000 |  | 2,300,000 | 2,300,000
Common shares of Brandywine Realty Trust's beneficial interest, par value | $ 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 | 142,690,755 | 134,601,796 |  |  |  |  |  |  |  |  |  |  |  |
Common shares of Brandywine Realty Trust's beneficial interest, shares outstanding | 142,690,755 | 134,485,117 |  |  |  |  |  |  |  |  |  |  |  |
Common shares in treasury, at cost, shares | 0 | 116,679 |  |  |  |  |  |  |  |  |  |  |  |
Common shares in grantor trust, shares | 292,646 | 291,281 |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Limited Partnership, units issued |  |  | 2,698,648 | 9,902,752 |  |  |  |  |  |  |  |  |  |
Redeemable Limited Partnership, units outstanding |  |  | 2,698,648 | 9,902,752 |  |  |  |  |  |  |  |  |  |
General Partners' Capital account, units issued |  |  | 142,690,755 | 134,601,796 |  |  |  |  |  |  |  |  |  |
General Partners' Capital account, units outstanding |  |  | 142,690,755 | 134,485,117 |  |  |  |  |  |  |  |  |  |

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