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Share-Based Compensation - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) age shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 5.5 | $ 8.0 | $ 8.6
Capitalized stock-based compensation expense | 0.1 | 0.2 | 0.3
Trustee |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of share-based compensation for each trustee | $ 0.1 | $ 0.1 | $ 0.1
Restricted share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
One-time equity award granted (shares) | shares | 410,928 | 408,606 | 238,134
Retirement age with 20 years employment | age | 55 |  |
Years of employment for retirement age metric | 20 years |  |
Retirement age | age | 65 |  |
Fair value of restricted share units vested | $ 7.3 | $ 11.1 | $ 7.6
Compensation costs not yet recognized | $ 4.2 |  |
Recognition period for compensation expense | 25 months |  |
Restricted share awards | Chief executive officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
One-time equity award granted (shares) | shares | 100,000 |  |
Percentage of equity award that vests on fifth anniversary of grant date | 100.00% |  |
Washington Real Estate Investment Trust 2016 Omnibus Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | shares | 2,400,000 |  |
Incentive plan, period in effect (in years) | 10 years |  |
Options outstanding (in shares) | shares | 0 | 0 |
Officer STIP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Short-term incentive plan, aggregate weighting of performance measures and time-based measures | 100.00% |  |
Officer LTIP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate weighting of performance and time-based measures (percent) | 100.00% |  |
Long-term incentive plan, percentage of performance-based award vested upon grant | 100.00% |  |
Officer LTIP | Time-based award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Vesting percentage per year over three-year vesting period (percent) | 33.33% |  |
Prior STIP | Non-executive officer and staff |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Incentive plan bonuses payable in cash (percent) | 100.00% |  |
Prior LTIP | Executive officers |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period (in years) | 3 years | 3 years | 3 years
Performance evaluated on relative TSR to FTSE Residential Index | 60.00% |  | 42.50%
Performance evaluated on relative TSR to defined population of peer companies | 40.00% | 100.00% | 50.00%
Performance evaluated on relative TSR to FTSE Office Index |  |  | 7.50%
Performance evaluated on relative TSR to FTSE Residential Index weighting | 40.00% |  |
Performance based on relative total shareholder return to peer companies, weighting, percentage |  | 100.00% |
Performance evaluated on relative TSR to FTSE NAREIT Diversified Index |  |  | 50.00%
Prior LTIP | Executive officers | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grant date fair value as a percentage of base salary for awards evaluated on relative TSR to defined population of peer companies | 27.00% | 32.00% | 37.00%
Grant date fair value as a percentage of base salary for awards evaluated on on relative TSR to FTSE NAREIT Diversified Index | 32.00% |  | 38.00%
Prior LTIP | Executive officers | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grant date fair value as a percentage of base salary for awards evaluated on relative TSR to defined population of peer companies | 137.00% | 248.00% |
Grant date fair value as a percentage of base salary for awards evaluated on on relative TSR to FTSE NAREIT Diversified Index | 159.00% |  |
Grant date fair value as a percentage of base salary for awards evaluated on on relative TSR |  |  | 78.00%
Grant date fair value as a percentage of base salary for awards evaluated on on absolute TSR |  |  | 80.00%
LTIP for non-executive officers and staff |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Performance period (in years) | 3 years |  |

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