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Equity, Capital and Other Interests Redeemable (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Redeemable Noncontrolling Interests Operating Partnership $ 541,866eqr_RedeemableNoncontrollingInterestsOperatingPartnership $ 500,733eqr_RedeemableNoncontrollingInterestsOperatingPartnership
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership 41,763us-gaap_MinorityInterestChangeInRedemptionValue  
Change in carrying value (630)us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease  
OPERATING PARTNERSHIP    
Limited Partners Change In Redemption Value 41,763eqr_LimitedPartnersChangeInRedemptionValue
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember		  
Limited Partners Change In Carrying Value (630)eqr_LimitedPartnersChangeInCarryingValue
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember		  
Redeemable Limited Partners $ 541,866eqr_RedeemableLimitedPartners
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember		 $ 500,733eqr_RedeemableLimitedPartners
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember