CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended
Jan. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Rental income		$ 167,972	$ 172,040
Tenant reimbursements and other income		45,083	45,220
Total revenues		213,055us-gaap_RealEstateRevenueNet	217,260us-gaap_RealEstateRevenueNet
Expenses:
Operating expenses		97,871	101,731
Depreciation and amortization		62,699	51,649
General and administrative		16,558us-gaap_GeneralAndAdministrativeExpense	24,848us-gaap_GeneralAndAdministrativeExpense
Loss (reversal of loss) on asset impairment		1,904us-gaap_AssetImpairmentCharges	(4,761)us-gaap_AssetImpairmentCharges
Acquisition related costs		0	5
Total expenses		179,032us-gaap_CostsAndExpenses	173,472us-gaap_CostsAndExpenses
Operating income		34,023us-gaap_OperatingIncomeLoss	43,788us-gaap_OperatingIncomeLoss
Interest and other income		3,448us-gaap_InterestAndOtherIncome	384us-gaap_InterestAndOtherIncome
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $29 and $(309), respectively)		(29,842)us-gaap_InterestExpense	(37,935)us-gaap_InterestExpense
Loss on early extinguishment of debt		(428)	0
Gain on issuance of shares by an equity investee		0	109
Gain on sale of properties		5,868us-gaap_GainLossOnSaleOfProperties	0us-gaap_GainLossOnSaleOfProperties
Income from continuing operations before income taxes and equity in earnings of investees		13,069	6,346
Income tax benefit (expense)		561us-gaap_IncomeTaxExpenseBenefit	(555)us-gaap_IncomeTaxExpenseBenefit
Equity in earnings of investees		0	10,934
Income from continuing operations attributable to Equity Commonwealth common shareholders		13,630	16,725
Discontinued operations:
Income from discontinued operations		0	4,011
Loss on asset impairment from discontinued operations		0	(288)
Net income		13,630us-gaap_NetIncomeLoss	20,448us-gaap_NetIncomeLoss
Preferred distributions		(6,981)	(11,151)
Net income attributable to Equity Commonwealth common shareholders		6,649	9,297
Amounts attributable to Equity Commonwealth common shareholders:
Income from continuing operations		6,649	5,574
Income from discontinued operations		0	4,011
Loss on asset impairment from discontinued operations		0	(288)
Net income attributable to Equity Commonwealth common shareholders		$ 6,649	$ 9,297
Weighted average common shares outstanding - basic (in shares)		129,696	118,400
Weighted average common shares outstanding — diluted (in shares)		129,874	118,400
Basic and diluted earnings per common share attributable to Equity Commonwealth common shareholders:
Income from continuing operations (in dollars per share)		$ 0.05	$ 0.05
Income from discontinued operations (in dollars per share)		$ 0.00	$ 0.03
Net income (in dollars per share)		$ 0.05us-gaap_EarningsPerShareBasicAndDiluted	$ 0.08us-gaap_EarningsPerShareBasicAndDiluted
Distributions declared per common share (in dollars per share)	$ 0.25	$ 0	$ 0.25

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In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. It also includes other real estate revenue.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Total costs of sales and operating expenses for the period.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

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Amount after tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until disposal.

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Amount after tax of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a discontinued operation.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries or equity method investee.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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No definition available.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

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Amount of the cost of borrowed funds accounted for as interest expense.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The net result for the period of deducting operating expenses from operating revenues.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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The aggregate revenue from real estate operations during the reporting period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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