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Basis of Presentation - Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Operating properties | $ 4,030,605 |  | $ 3,951,719 |  |  |
Accumulated depreciation | (940,833) |  | (885,407) |  |  |
Operating real estate investments, net | 3,111,773 |  | 3,066,312 |  |  |
Total assets | 4,048,474 |  | 4,076,976 |  |  |
Additional Paid-in Capital | 3,188,239 |  | 3,200,312 |  |  |
Cumulative Earnings | 781,017 |  | 775,625 |  |  |
Total Brandywine Realty Trust's equity | 1,717,819 |  | 1,798,827 |  |  |
Noncontrolling interests | 11,846 |  | 12,201 |  |  |
Total beneficiaries' equity | 1,729,665 | $ 1,760,463 | 1,811,028 | $ 1,830,525 | $ 1,847,251 | $ 1,826,870
Total liabilities and beneficiaries' equity | 4,048,474 |  | 4,076,976 |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Operating properties | 4,030,605 |  | 3,951,719 |  |  |
Accumulated depreciation | (940,833) |  | (885,407) |  |  |
Operating real estate investments, net | 3,111,773 |  | 3,066,312 |  |  |
Total assets | 4,048,474 |  | 4,076,976 |  |  |
General Partnership Capital | 1,715,685 |  | 1,791,591 |  |  |
Total Brandywine Operating Partnership, L.P.'s equity | 1,713,181 |  | 1,796,316 |  |  |
Total partners' equity | 1,715,445 | $ 1,745,042 | 1,798,508 | $ 1,805,756 | $ 1,824,205 | $ 1,799,955
Total liabilities and beneficiaries' equity | $ 4,048,474 |  | 4,076,976 |  |  |
As Previously Reported [Member] |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Operating properties |  |  | 3,953,319 |  |  |
Accumulated depreciation |  |  | (865,462) |  |  |
Operating real estate investments, net |  |  | 3,087,857 |  |  |
Total assets |  |  | 4,098,521 |  |  |
Additional Paid-in Capital |  |  | 3,200,850 |  |  |
Cumulative Earnings |  |  | 796,513 |  |  |
Total Brandywine Realty Trust's equity |  |  | 1,820,253 |  |  |
Noncontrolling interests |  |  | 12,320 |  |  |
Total beneficiaries' equity |  |  | 1,832,573 |  |  |
Total liabilities and beneficiaries' equity |  |  | 4,098,521 |  |  |
As Previously Reported [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Operating properties |  |  | 3,953,319 |  |  |
Accumulated depreciation |  |  | (865,462) |  |  |
Operating real estate investments, net |  |  | 3,087,857 |  |  |
Total assets |  |  | 4,098,521 |  |  |
General Partnership Capital |  |  | 1,813,136 |  |  |
Total Brandywine Operating Partnership, L.P.'s equity |  |  | 1,817,861 |  |  |
Total partners' equity |  |  | 1,820,053 |  |  |
Total liabilities and beneficiaries' equity |  |  | 4,098,521 |  |  |
Adjustments [Member] |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Operating properties |  |  | (1,600) |  |  |
Accumulated depreciation |  |  | (19,945) |  |  |
Operating real estate investments, net |  |  | (21,545) |  |  |
Total assets |  |  | (21,545) |  |  |
Additional Paid-in Capital |  |  | (538) |  |  |
Cumulative Earnings |  |  | (20,888) |  |  |
Total Brandywine Realty Trust's equity |  |  | (21,426) |  |  |
Noncontrolling interests |  |  | (119) |  |  |
Total beneficiaries' equity |  |  | (21,545) |  |  |
Total liabilities and beneficiaries' equity |  |  | (21,545) |  |  |
Adjustments [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Operating properties |  |  | (1,600) |  |  |
Accumulated depreciation |  |  | (19,945) |  |  |
Operating real estate investments, net |  |  | (21,545) |  |  |
Total assets |  |  | (21,545) |  |  |
General Partnership Capital |  |  | (21,545) |  |  |
Total Brandywine Operating Partnership, L.P.'s equity |  |  | (21,545) |  |  |
Total partners' equity |  |  | (21,545) |  |  |
Total liabilities and beneficiaries' equity |  |  | $ (21,545) |  |  |

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