Equity Award, Conversion Basis

No definition available.

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- Definition

Number of Tranches

+ References

No definition available.

+ Details

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- Definition

Represents the number of trustees serving in the board of trustees of the reporting entity.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement, Plan Term

+ References

No definition available.

+ Details

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- Definition

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

+ References

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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- Definition

Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

+ References

No definition available.

+ Details

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

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).

+ References

+ Details

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ References

+ Details

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

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- Definition

Value, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

+ References

No definition available.

+ Details

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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions					1 Months Ended	5 Months Ended	9 Months Ended	10 Months Ended	12 Months Ended
	Feb. 04, 2025	Jun. 18, 2024 USD ($) trustee $ / shares shares	Jan. 29, 2024 $ / shares shares	Jun. 16, 2015	Feb. 28, 2025	Jun. 13, 2025 shares	Sep. 30, 2025 tranche $ / shares shares	Oct. 31, 2024 USD ($)	Dec. 31, 2024 $ / shares shares	Dec. 31, 2023 shares	Jun. 13, 2023 shares	Jun. 20, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)											1,650,000
Number of independent trustees \| trustee		6
Compensation expense, accelerated vesting due to a staffing reduction \| $								$ 0.4
Equity Commonwealth 2015 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)												2,500,000
Share-based compensation arrangement, plan term				10 years
General and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense \| $								$ 9.1
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)			142,146
Granted (in dollars per share) \| $ / shares			$ 19.36
Restricted shares \| Independent Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)		31,090
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							3 years
Number of tranches \| tranche							2
Vested (in shares)						873,406			391,932
Common stock issued (in shares)						873,406			391,932
Unvested (in shares)									873,406
RSUs \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%						50.00%
RSUs \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							1 year
Vesting percentage					50.00%		50.00%
RSUs, target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)			288,596
RSUs, maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)			719,326
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award, conversion basis							1
Number of equity awards granted (in shares)		6,218
Restricted Shares and Time-Based LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		1 year
Number of equity awards granted (in shares)		6,218					0		179,454
Granted (in dollars per share) \| $ / shares							$ 0		$ 19.35
Share based compensation amount \| $		$ 0.1
Price per share (in dollars per share) \| $ / shares		$ 19.30
Vested (in shares)							394,780		115,265
Unvested (in shares)							0		394,780	330,591
RSUs and Market-Based LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)							0		719,326
Granted (in dollars per share) \| $ / shares							$ 0		$ 10.86
Vested (in shares)							932,430		391,932
Unvested (in shares)							0		2,134,182	2,038,776
Maximum \| Equity Commonwealth 2015 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for issuance (in shares)							7,400,000