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v3.19.3.a.u2

Organization (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) community building investment apartment project shares | Dec. 31, 2018 USD ($) shares
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
General partner ownership interest | 96.60% | 96.60%
Limited partner - ownership percentage | 3.40% | 3.40%
Operating Partnership units outstanding (in shares) | shares | 2,301,653 | 2,305,389
Redemption value of operating partnership units outstanding | $ | $ 692.5 | $ 565.3
Number of apartment communities owned | community | 250 |
Number of apartment units owned | apartment | 60,570 |
Ownership interests, number of commercial buildings | building | 1 |
Ownership interests, number of consolidated projects | project | 5 |
Ownership Interests, number of unconsolidated projects | investment | 2 |

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- Definition Aggregate number of apartment units owned as of the balance sheet date. + References No definition available. + Details
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Balance Type: | na
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- Definition Noncontrolling interest in Operating Partnership, which includes the Operating Partnership's vested long term incentive plan units and cumulative redeemable preferred units. + References No definition available. + Details
Name: | ess_NoncontrollingInterestOperatingPartnership
Namespace Prefix: | ess_
Data Type: | num:percentItemType
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- Definition The number of apartment communities owned as of the balance sheet date. + References No definition available. + Details
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Balance Type: | na
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- Definition Operating partnership units owned by noncontrolling interest partners, including Long Term Incentive Plan Units which convert to Partnership units. + References No definition available. + Details
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- Definition The number of commercial buildings in which the company has an ownership interest. + References No definition available. + Details
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- Definition Ownership Interests, Number Of Consolidated Projects + References No definition available. + Details
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- Definition Ownership Interests, Number Of Unconsolidated Projects + References No definition available. + Details
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- Definition Description of redemption value of total operating partnership units. + References No definition available. + Details
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Balance Type: | credit
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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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