CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 24,012us-gaap_ProfitLoss	$ (156,967)us-gaap_ProfitLoss	$ (79,845)us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation	166,076us-gaap_Depreciation	178,353us-gaap_Depreciation	188,123us-gaap_Depreciation
Net amortization of debt discounts, premiums and deferred financing fees	(552)	81	3,405
Straight line rental income	(12,759)us-gaap_StraightLineRent	(31,229)us-gaap_StraightLineRent	(38,812)us-gaap_StraightLineRent
Amortization of acquired real estate leases	51,140us-gaap_AmortizationOfIntangibleAssets	59,274us-gaap_AmortizationOfIntangibleAssets	60,176us-gaap_AmortizationOfIntangibleAssets
Other amortization	20,931	18,850	19,955
Loss on asset impairment	187,305us-gaap_ImpairmentOfRealEstate	227,122us-gaap_ImpairmentOfRealEstate	168,632us-gaap_ImpairmentOfRealEstate
Loss on early extinguishment of debt	(1,564)	61,063	1,895
Equity in earnings of investees	(24,460)	(25,754)	(11,420)
Gain on issuance of shares by an equity investee	(17,020)	0	(7,246)
Gain on sale of equity investment	(171,561)	(66,293)	0
Distributions of earnings from investees	20,680	23,911	10,835
Net loss (gain) on sale of properties	0	20,566	(2,039)
Other non-cash expenses	8,135us-gaap_OtherNoncashExpense	0us-gaap_OtherNoncashExpense	0us-gaap_OtherNoncashExpense
Change in assets and liabilities:
Restricted cash	3,486	(1,832)	(6,216)
Rents receivable and other assets	(54,773)	(57,039)	(38,801)
Accounts payable and accrued expenses	10,389	(14,333)	6,034
Rent collected in advance	(229)	125	(1,104)
Security deposits	433	611	1,548
Due to related persons	(9,277)	(1,858)	1,663
Cash provided by operating activities	200,392	234,651	276,783
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate acquisitions	0us-gaap_PaymentsToAcquireRealEstate	(154,370)us-gaap_PaymentsToAcquireRealEstate	(631,279)us-gaap_PaymentsToAcquireRealEstate
Real estate improvements	(99,651)eqc_CashPaidForRealEstateImprovements	(114,451)eqc_CashPaidForRealEstateImprovements	(131,300)eqc_CashPaidForRealEstateImprovements
Principal payments received from direct financing lease	7,311	6,970	6,645
Principal payments received from real estate mortgages receivable	0	1,000	0
Proceeds from sale of properties, net	185,299	224,976	9,643
Proceeds from sale of equity investment, net	710,492	239,576	0
Distributions in excess of earnings from investees	0	168	5,981
Investment in Affiliates Insurance Company	0	0	(5,335)
Decrease (increase) in restricted cash	900	(3,685)	(2,541)
Deconsolidation of a subsidiary	0	(12,286)	0
Cash provided by (used in) investing activities	804,351	187,898	(748,186)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common shares, net	0	626,809	363,657
Redemption of preferred shares	0	0	(150,000)
Repurchase and retirement of outstanding debt securities	0us-gaap_RepaymentsOfSeniorDebt	(728,021)us-gaap_RepaymentsOfSeniorDebt	0us-gaap_RepaymentsOfSeniorDebt
Proceeds from borrowings	0	1,036,000	1,702,500
Payments on borrowings	(785,316)us-gaap_RepaymentsOfLongTermDebt	(1,065,432)us-gaap_RepaymentsOfLongTermDebt	(1,312,982)us-gaap_RepaymentsOfLongTermDebt
Deferred financing fees	0us-gaap_PaymentsOfFinancingCosts	(1,204)us-gaap_PaymentsOfFinancingCosts	(15,117)us-gaap_PaymentsOfFinancingCosts
Distributions to common shareholders	(29,597)us-gaap_PaymentsOfDividendsCommonStock	(109,702)us-gaap_PaymentsOfDividendsCommonStock	(146,539)us-gaap_PaymentsOfDividendsCommonStock
Distributions to preferred shareholders	(32,095)	(44,604)	(52,710)
Distributions to noncontrolling interest in consolidated subsidiary	0	(14,863)	(8,386)
Cash (used in) provided by financing activities	(847,008)	(301,017)	380,423
Effect of exchange rate changes on cash	(1,126)	(1,302)	436
Increase (decrease) in cash and cash equivalents	156,609	120,230	(90,544)
Cash and cash equivalents at beginning of year	222,449	102,219	192,763
Cash and cash equivalents at end of year	379,058	222,449	102,219
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	146,265us-gaap_InterestPaid	192,010us-gaap_InterestPaid	204,772us-gaap_InterestPaid
Taxes paid	2,732us-gaap_IncomeTaxesPaid	1,303us-gaap_IncomeTaxesPaid	779us-gaap_IncomeTaxesPaid
NON-CASH INVESTING ACTIVITIES:
Real estate acquisitions	0	0	(370,139)
Investment in real estate mortgages receivable	0	(7,688)	(1,419)
Net assets transferred to Select Income REIT	0us-gaap_TransferOfOtherRealEstate	492,736us-gaap_TransferOfOtherRealEstate	0us-gaap_TransferOfOtherRealEstate
Increase (decrease) in capital expenditures recorded as liabilities	7,690	(8,475)	(4,501)
NON-CASH FINANCING ACTIVITIES:
Assumption of mortgage notes payable	0	0	359,213
Liabilities assumed	$ 0us-gaap_LiabilitiesAssumed1	$ 0us-gaap_LiabilitiesAssumed1	$ 10,926us-gaap_LiabilitiesAssumed1

Cash paid for improvements made to real estate investments during the period.

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The cash inflow from equity investments in which the investee does not have sufficient US GAAP earnings (accumulated or in the current period) to distribute funds, thereby constituting a return of investment.

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This element represents the gain (loss) included in earnings related to continuing and discontinued properties resulting from the sale of a business component. 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 represents the difference between the fair value of the payments made and the carrying amount of the debt classified in continuing and discontinued operations at the time of its extinguishment.

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The net change during the reporting period in rent receivables and other operating assets which is not otherwise defined in the taxonomy.

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This element represents the non-cash portion of investments in real estate mortgages receivable.

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Represents the cash inflow received by the entity during the reporting period from repayments of principal related to direct financing lease.

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No definition available.

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This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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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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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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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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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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Change during the period in carrying value for all deferred liabilities due within one year or operating cycle.

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The increase (decrease) in obligations owed to an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The increase (decrease) during the reporting period in security deposits.

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The amount of cash paid for interest during the period.

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The fair value of liabilities assumed in noncash investing or financing activities.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

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