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Fair Value of Assets and Liabilities - Schedule of Valuation Techniques and Significant Unobservable Inputs Used for Level 3 Fair Value Measurements (Details) (Level 3, USD $)
In Thousands, unless otherwise specified
 12 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Real estate properties held for sale | Discounted cash flows      
Fair Value of Assets and Liabilities      
Fair value of assets $ 414,625us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= eqc_RealEstateHeldForSaleMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember		 $ 471,457us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= eqc_RealEstateHeldForSaleMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember		  
Discount rate 10.20%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= eqc_RealEstateHeldForSaleMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember		 10.30%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= eqc_RealEstateHeldForSaleMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember		  
Exit capitalization rate 9.10%eqc_FairValueInputsExitCapitalizationRate
/ us-gaap_FairValueByAssetClassAxis
= eqc_RealEstateHeldForSaleMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember		 8.80%eqc_FairValueInputsExitCapitalizationRate
/ us-gaap_FairValueByAssetClassAxis
= eqc_RealEstateHeldForSaleMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember		  
225 Water Street | Discounted cash flows      
Fair Value of Assets and Liabilities      
Fair value of assets     19,589us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember
Discount rate     8.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember
Exit capitalization rate     8.00%eqc_FairValueInputsExitCapitalizationRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= eqc_DiscountedCashFlowsMember
Derivative liability      
Fair Value of Assets and Liabilities      
Fair value of liabilities $ (6,658)us-gaap_FinancialLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember		    
Risk free rate 0.50%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember		    
Volatility rate 20.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember