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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Footnote) (Details) (Share award plan, Restricted stock units)
12 Months Ended
Dec. 31, 2014
Share award plan | Restricted stock units
 
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Number of RSUs that would have been issued based on the Company's performance criteria detailed in the Plan (in shares) 0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= eqc_ShareAwardPlanMember