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Indebtedness - Summary of Outstanding Senior Notes Purchased for Cash Pursuant to a Tender Offer (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Debt Instrument [Line Items]  
Principal $ 670,295us-gaap_DebtInstrumentRepurchasedFaceAmount
Purchase Price 726,151us-gaap_DebtInstrumentRepurchaseAmount
Senior Notes, due 2014 at 5.75%  
Debt Instrument [Line Items]  
Principal 145,612us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= eqc_SeniorNotesFivePointSevenFivePercentDue2014Member
Purchase Price 148,746us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= eqc_SeniorNotesFivePointSevenFivePercentDue2014Member
Senior Notes, due 2015 at 6.40%  
Debt Instrument [Line Items]  
Principal 152,560us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= eqc_SeniorNotes6.40PercentDue2015Member
Purchase Price 164,140us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= eqc_SeniorNotes6.40PercentDue2015Member
Senior Notes, due 2015 at 5.75%  
Debt Instrument [Line Items]  
Principal 111,227us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= eqc_SeniorNotesFivePointSevenFivePercentDue2015Member
Purchase Price 121,047us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= eqc_SeniorNotesFivePointSevenFivePercentDue2015Member
Senior Notes, due 2016 at 6.25%  
Debt Instrument [Line Items]  
Principal 260,896us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= eqc_SeniorNotesSixPointTwoFivePercentDue2016Member
Purchase Price $ 292,218us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= eqc_SeniorNotesSixPointTwoFivePercentDue2016Member