Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income from continuing operations	$ 190,020	$ 81,680
Allocation to Noncontrolling Interests - Operating Partnership, net	(7,051)	(3,053)
Net (income) attributable to Noncontrolling Interests - Partially Owned Properties	(643)	(504)
Preferred distributions	(891)us-gaap_DividendsPreferredStock	(1,036)us-gaap_DividendsPreferredStock
Premium on redemption of Preferred Shares	(2,789)us-gaap_PreferredStockRedemptionPremium	0us-gaap_PreferredStockRedemptionPremium
Income from continuing operations available to Common Shares, net of Noncontrolling Interests	178,646	77,087
Discontinued operations, net of Noncontrolling Interests	196	1,012
Numerator for net income per share - basic	178,842	78,099
Income from continuing operations available to Common Shares	185,697	80,140
Discontinued operations, net	204	1,052
Numerator for net income per share - diluted	185,901	81,192
Denominator for net income per share - basic	363,098	360,470
Effect of dilutive securities - OP Units	13,598eqr_DilutiveOpUnits	13,731eqr_DilutiveOpUnits
Effect of dilutive securities - Long-term compensation shares/units	3,631eqr_DilutiveSecuritiesOptions	2,183eqr_DilutiveSecuritiesOptions
Denominator for net income per share - diluted	380,327	376,384
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Net income per share - diluted	$ 0.489us-gaap_EarningsPerShareDiluted	$ 0.216us-gaap_EarningsPerShareDiluted
Income from continuing operations available to Common Shares	$ 0.492	$ 0.214
Net income per share - basic - Discontinued operations, net of Noncontrolling Interests	$ 0.001	$ 0.003
Income from continuing operations available to Common Shares	$ 0.488	$ 0.213
Net income per share - diluted - discontinued operations, net	$ 0.001	$ 0.003
OPERATING PARTNERSHIP
Income from continuing operations	190,020	81,680
Net (income) attributable to Noncontrolling Interests - Partially Owned Properties	(643)	(504)
Premium on redemption of Preferred Shares	(2,789)	0
Discontinued operations, net	204	1,052
Effect of dilutive securities - Long-term compensation shares/units	3,631	2,183
Net income per share - basic	$ 0.493	$ 0.217
Net income per share - diluted	$ 0.489	$ 0.216
Income from continuing operations available to Common Shares	$ 0.492	$ 0.214
Income from continuing operations available to Common Shares	$ 0.488	$ 0.213
Dividend preference units	(891)	(1,036)
Income from continuing operations available to Units	185,697	80,140
Numerator for net income per Unit - basic and diluted	$ 185,901	$ 81,192
Denominator for net income per Unit - basic	376,696	374,201
Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted	380,327	376,384
Net income per Unit - basic - Discontinued operations, net	$ 0.001	$ 0.003
Net income per Unit - diluted - Discontinued operations, net	$ 0.001	$ 0.003

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

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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

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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: