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SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE      
Face Amount of Mortgage     $ 8,107us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
Carrying Amount of Mortgage 8,100us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages   8,107us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Principal Amount of Loans Subject to Delinquent Principal or Interest     0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
Reconciliation of the carrying amount of mortgage loans at the beginning of the period:      
Balance at the beginning of period 1,419us-gaap_MortgageLoansOnRealEstate 0us-gaap_MortgageLoansOnRealEstate  
New mortgage loans 7,688us-gaap_MortgageLoansOnRealEstateNewMortgageLoans 1,419us-gaap_MortgageLoansOnRealEstateNewMortgageLoans  
Collections of principal (1,000)us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal    
Balance at the end of period 8,107us-gaap_MortgageLoansOnRealEstate 1,419us-gaap_MortgageLoansOnRealEstate 8,107us-gaap_MortgageLoansOnRealEstate
Salina, NY      
SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE      
Interest Rate     6.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_SalinaNYMember
Periodic Payment Terms     419us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_SalinaNYMember
Face Amount of Mortgage     419us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_SalinaNYMember
Carrying Amount of Mortgage     419us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_SalinaNYMember
Principal Amount of Loans Subject to Delinquent Principal or Interest     0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_SalinaNYMember
Dearborn, MI      
SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE      
Interest Rate     6.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_DearbornMIMember
Periodic Payment Terms     7,688us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_DearbornMIMember
Face Amount of Mortgage     7,688us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_DearbornMIMember
Carrying Amount of Mortgage     7,688us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_DearbornMIMember
Principal Amount of Loans Subject to Delinquent Principal or Interest     $ 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ eqc_RealEstatePropertiesByLocationAxis
= eqc_DearbornMIMember