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SHARE-BASED COMPENSATION - Narrative (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
May 30, 2024 shares | Dec. 31, 2024 USD ($) age shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | May 29, 2024 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ |  | $ 5.2 | $ 5.5 | $ 8.0 |
Capitalized stock-based compensation expense | $ |  | 0.1 | 0.1 | 0.2 |
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 |  | 280,008 | 410,928 | 408,606 |
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 | $ |  | $ 4.1 | $ 7.3 | $ 11.1 |
Compensation costs not yet recognized | $ |  | $ 3.5 |  |  |
Recognition period for compensation expense |  | 20 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] |  |  |  |  |
Aggregate number of shares additional authorized for stock based awards (in shares) | shares | 2,900,000 |  |  |  |
Aggregate number of shares authorized for stock based awards (in shares) | shares | 5,300,000 |  |  |  | 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 |  |  |
Officer LTIP | Time-based award | Share-Based Payment Arrangement, Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage per year over three-year vesting period (percent) |  | 33.33% |  |  |
Officer LTIP | Time-based award | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage per year over three-year vesting period (percent) |  | 33.33% |  |  |
Officer LTIP | Time-based award | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
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% | 60.00% |  |
Performance evaluated on relative TSR to defined population of peer companies |  | 40.00% | 40.00% | 100.00% |
Performance evaluated on relative TSR to FTSE residential index weighting |  | 40.00% | 40.00% |  |
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 |  | 51.00% | 27.00% |  |
Grant date fair value as a percentage of base salary for awards evaluated on relative TSR to FTSE NAREIT diversified index |  | 64.00% | 32.00% |  |
Grant date fair value as a percentage of base salary for awards evaluated on on relative TSR |  |  |  | 32.00% |
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 |  | 155.00% | 137.00% |  |
Grant date fair value as a percentage of base salary for awards evaluated on relative TSR to FTSE NAREIT diversified index |  | 195.00% | 159.00% |  |
Grant date fair value as a percentage of base salary for awards evaluated on on relative TSR |  |  |  | 248.00% |
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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