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Incentive Plan Award, Performance Based On Relative Total Shareholder Return, Grant Date Fair Value As Percentage Of Base Salary

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Incentive Plan Award, Performance Based On Relative Total Shareholder Return To FTSE NAREIT Diversified Index, Percentage

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Incentive Plan Award, Performance Based On Relative Total Shareholder Return To FTSE NAREIT Residential Index, Percentage

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Incentive Plan Award, Performance Based On Relative Total Shareholder Return To Peer Companies, Grant Date Fair Value As Percentage Of Base Salary

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Long-Term Incentive Plan, Aggregate Weighting Of Performance Measures And Time-Based Measures

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Long-Term Incentive Plan, Percentage of Performance-Based Award Vested Upon Grant

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Restricted Share Award, Retirement Age

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Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Award Vesting On Fifth Anniversary Of Grant

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Short-Term Incentive Plan, Aggregate Weighting Of Performance Measures And Time-Based Measures

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Share-Based Compensation - Narrative (Details) $ in Millions	12 Months Ended
	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