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Shareholders' Equity - Schedule of Distributions Paid Per Common Share (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity [Abstract]      
Ordinary income 0.00%eqc_CommonStockDividendsOrdinaryIncomeDistributionPercentage 0.00%eqc_CommonStockDividendsOrdinaryIncomeDistributionPercentage 61.72%eqc_CommonStockDividendsOrdinaryIncomeDistributionPercentage
Return of capital 0.00%eqc_CommonStockDividendsReturnofCapitalDistributionPercentage 100.00%eqc_CommonStockDividendsReturnofCapitalDistributionPercentage 38.28%eqc_CommonStockDividendsReturnofCapitalDistributionPercentage
Capital gain 100.00%eqc_CommonStockDividendsCapitalGainDistributionPercentage 0.00%eqc_CommonStockDividendsCapitalGainDistributionPercentage 0.00%eqc_CommonStockDividendsCapitalGainDistributionPercentage
Unrecaptured Section 1250 gain 0.00%eqc_CommonStockDividendsDepreciationRecaptureGainPercentage 0.00%eqc_CommonStockDividendsDepreciationRecaptureGainPercentage 0.00%eqc_CommonStockDividendsDepreciationRecaptureGainPercentage
Common Stock, Dividends, Distribution Percentage 100.00%eqc_CommonStockDividendsDistributionPercentage 100.00%eqc_CommonStockDividendsDistributionPercentage 100.00%eqc_CommonStockDividendsDistributionPercentage