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The amount of for cost of asset previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets.

No definition available.

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Refers to capitalized salaries incurred during the year.

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Refers to promotion fees shares by co investees during the year.

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Expected lease term over which the Company expects to retain the acquired tenant.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of debt obligations and debt which accrues interest at a set, unchanging rate.

No definition available.

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Fair value of the current and noncurrent portions, as of the balance sheet date, of debt obligations and debt which accrues interest at a set, unchanging rate.

No definition available.

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Date of maturity of mortgage backed securities categorized as held-to-maturity.

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Date of maturity of mortgage backed securities categorized as held-to-maturity.

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Maximum of general lease terms.

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General minimum period of a lease.

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The carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE) net intercompany eliminations.

No definition available.

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Noncontrolling interest in Operating Partnership, which includes the Operating Partnership's vested long term incentive plan units and cumulative redeemable preferred units.

No definition available.

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Maximum no rent time period offered as an incentive on a lease.

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Minimum no rent time period offered as an incentive on a lease.

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The number of communities within the DownREIT partnerships.

No definition available.

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The number of DownREIT limited partnerships the company consolidates.

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Maximum original maturities of highly liquid investments to be classified as cash equivalents.

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Promote income recognize in statement of operations earned as a result of achieving certain performance hurdles as defined in joint venture agreement.

No definition available.

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Name:	ess_RealEstateRentalPropertiesAbstract
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Conversion basis used in exercising redemption rights of limited partners by issuance of shares of common stock for partnership unit.

No definition available.

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Description of redemption value of total variable interest entities units outstanding.

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The portion of cash dividends distributed during the period relating to capital gain.

No definition available.

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The portion of cash dividends distributed during the period relating to ordinary income.

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The portion of cash dividends distributed during the period relating to unrecaptured section 1250 capital gain (loss).

No definition available.

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The portion of cash dividends distributed during the period relating to return of capital.

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The total cash dividends distributed during the period.

No definition available.

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Threshold useful life of assets for capitalization.

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Total cost of debt and equity securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

No definition available.

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Total fair value of marketable securities as of the balance sheet date.

No definition available.

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Total amount of gross unrealized gains (losses) for securities, at a point in time.

No definition available.

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DownREIT Partnership's Outstanding operating partnership units owned by noncontrolling interest partners.

No definition available.

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The portion of the carrying amount of long-term borrowings, outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

No definition available.

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The fair value of long-term borrowings, outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

No definition available.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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Amount of investments in debt securities categorized as held-to-maturity valued at amortized cost, excludes other than temporary impairment (OTTI).

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This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

No definition available.

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Interest generated from day to day operating activities of the business. This element represents a revenue generating activity and is therefore gross (before any related cost of revenue items).

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This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration