Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income (loss) from continuing operations	$ 657,101	$ (168,174)	$ 160,298
Income (Loss) Attributable to Noncontrolling Interest	(24,771)	6,834	(6,417)
Net (income) loss attributable to Noncontrolling Interests - Partially Owned Properties	(2,544)	538	(844)
Dividends, Preferred Stock	(4,145)us-gaap_DividendsPreferredStock	(4,145)us-gaap_DividendsPreferredStock	(10,355)us-gaap_DividendsPreferredStock
Premium on redemption of Preferred Shares	0us-gaap_RedemptionPremium	0us-gaap_RedemptionPremium	(5,152)us-gaap_RedemptionPremium
Income (Loss) from Continuing Operations Attributable to Parent	625,641	(164,947)	137,530
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	1,522	1,991,415	688,682
Net Income (Loss) Available to Common Stockholders, Basic	627,163	1,826,468	826,212
Income From Continuing Operations Available To Common Shares	650,412		143,947
Discontinued operations, net	1,582	2,073,527	720,906
Net Income (Loss) Available to Common Stockholders, Diluted	651,994	1,826,468	864,853
Weighted average Common Shares outstanding	361,181	354,305	302,701
Dilutive Op Units	13,718eqr_DilutiveOpUnits		13,853eqr_DilutiveOpUnits
Dilutive Securities Options	2,836eqr_DilutiveSecuritiesOptions		3,212eqr_DilutiveSecuritiesOptions
Weighted Average Number of Shares Outstanding, Diluted	377,735	354,305	319,766
Net Income per share - basic	$ 1.736us-gaap_EarningsPerShareBasic	$ 5.155us-gaap_EarningsPerShareBasic	$ 2.729us-gaap_EarningsPerShareBasic
Net income per share - diluted	$ 1.726us-gaap_EarningsPerShareDiluted	$ 5.155us-gaap_EarningsPerShareDiluted	$ 2.705us-gaap_EarningsPerShareDiluted
Income (loss) from continuing operations available to Common Shares	$ 1.732	$ (0.466)	$ 0.454
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 0.004	$ 5.621	$ 2.275
Income (Loss) from Continuing Operations, Per Diluted Share	$ 1.722	$ (0.466)	$ 0.450
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.004	$ 5.621	$ 2.255
OPERATING PARTNERSHIP
Income (loss) from continuing operations	657,101	(168,174)	160,298
Net (income) loss attributable to Noncontrolling Interests - Partially Owned Properties	(2,544)	538	(844)
Premium on redemption of Preferred Shares	0	0	(5,152)
Discontinued operations, net	1,582	2,073,527	720,906
Dilutive Securities Options	2,836		3,212
Net Income per share - basic	$ 1.736	$ 5.155	$ 2.729
Net income per share - diluted	$ 1.726	$ 5.155	$ 2.705
Income (loss) from continuing operations available to Common Shares	$ 1.732	$ (0.466)	$ 0.454
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 0.004	$ 5.621	$ 2.275
Income (Loss) from Continuing Operations, Per Diluted Share	$ 1.722	$ (0.466)	$ 0.450
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.004	$ 5.621	$ 2.255
Dividend preference units	(4,145)	(4,145)	(10,355)
Income Loss From Continuing Operations Available To Units	650,412	(171,781)	143,947
Net Income loss available to Op unitholders basic diluted numerator	$ 651,994	$ 1,901,746	$ 864,853
Weighted Average Limited Partnership and General Partnership Units Outstanding, Basic	374,899	368,038	316,554
Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted	377,735	368,038	319,766

Amount of net (income) loss for the period allocated to noncontrolling partners in partially owned properties.

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Weighted average number of limited partnership and general partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership and general partnership units have been outstanding to the total time in that period. Includes, for example, the number of units distributed to unit holders whereby unit holders have the ability to elect to receive the unit holders' entire distribution in cash or units of equivalent value or there is a potential limitation on the total amount of cash that all unit holders can elect to receive in aggregate.

+ References

No definition available.

+ Details

Name:	us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

+ Details

Name:	us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=us-gaap_PartnershipInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: