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Lease Intangibles - Summary of the Carrying Amounts for Acquired Real Estate Leases and Assumed Real Estate Lease Obligations (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Acquired real estate leases $ 394,046eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldandUsedinOperations $ 410,698eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldandUsedinOperations
Acquired real estate leases, properties held for sale   11,398eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldforsale
Acquired real estate leases, net 198,287eqc_FiniteLivedIntangibleAssetsAcquiredPropertiesHeldandUsedinOperationsNet 255,812eqc_FiniteLivedIntangibleAssetsAcquiredPropertiesHeldandUsedinOperationsNet
Acquired real estate leases, properties held for sale, net   6,937eqc_FiniteLivedIntangibleAssetsPropertiesHeldforsaleNet
Assumed real estate lease obligations, net 26,784eqc_FinitelivedIntangibleAssetsforPropertiesAssumedHeldandUsedinOperations 33,935eqc_FinitelivedIntangibleAssetsforPropertiesAssumedHeldandUsedinOperations
Assumed real estate lease obligations, properties held for sale, net   2,070eqc_FinitelivedIntangibleAssetsforPropertiesAssumedHeldforsale
Leases, Acquired-in-Place    
Finite-Lived Intangible Assets [Line Items]    
Acquired real estate leases 272,077eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember		 282,754eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Acquired real estate leases, properties held for sale   9,351eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldforsale
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Accumulated amortization (136,089)eqc_FiniteLivedIntangibleAssetsAcquiredAccumulatedAmortizationforPropertiesHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember		 (106,045)eqc_FiniteLivedIntangibleAssetsAcquiredAccumulatedAmortizationforPropertiesHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Accumulated amortization, properties held for sale   (4,461)eqc_FiniteLivedIntangibleAssetsAccumulatedAmortizationForPropertiesHeldForSale
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Leases Acquired-in-Place, Above Market Lease    
Finite-Lived Intangible Assets [Line Items]    
Acquired real estate leases 121,969eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceAboveMarketLeaseMember		 127,944eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceAboveMarketLeaseMember
Acquired real estate leases, properties held for sale   2,047eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldforsale
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceAboveMarketLeaseMember
Accumulated amortization (59,670)eqc_FiniteLivedIntangibleAssetsAcquiredAccumulatedAmortizationforPropertiesHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceAboveMarketLeaseMember		 (48,841)eqc_FiniteLivedIntangibleAssetsAcquiredAccumulatedAmortizationforPropertiesHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceAboveMarketLeaseMember
Accumulated amortization, properties held for sale   0eqc_FiniteLivedIntangibleAssetsAccumulatedAmortizationForPropertiesHeldForSale
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceAboveMarketLeaseMember
Leases Acquired-in-Place, Below Market Lease    
Finite-Lived Intangible Assets [Line Items]    
Acquired real estate leases 56,541eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceBelowMarketLeaseMember		 56,815eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceBelowMarketLeaseMember
Acquired real estate leases, properties held for sale   4,996eqc_FinitelivedIntangibleAssetsforPropertiesAcquiredHeldforsale
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceBelowMarketLeaseMember
Accumulated amortization (29,757)eqc_FiniteLivedIntangibleAssetsAcquiredAccumulatedAmortizationforPropertiesHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceBelowMarketLeaseMember		 (22,880)eqc_FiniteLivedIntangibleAssetsAcquiredAccumulatedAmortizationforPropertiesHeldandUsedinOperations
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceBelowMarketLeaseMember
Accumulated amortization, properties held for sale   $ (2,926)eqc_FiniteLivedIntangibleAssetsAccumulatedAmortizationForPropertiesHeldForSale
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= eqc_LeasesAcquiredinPlaceBelowMarketLeaseMember