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Real Estate Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Land	17,297us-gaap_Land	$ 17,297us-gaap_Land
Buildings and improvements	56,226us-gaap_InvestmentBuildingAndBuildingImprovements	56,168us-gaap_InvestmentBuildingAndBuildingImprovements
Intangibles	329sjw_RealEstateInvestmentsIntangibles	329sjw_RealEstateInvestmentsIntangibles
Subtotal	73,852us-gaap_RealEstateInvestmentPropertyAtCost	73,794us-gaap_RealEstateInvestmentPropertyAtCost
Less accumulated depreciation and amortization	11,982us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation	11,593us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Total	61,870us-gaap_PropertyPlantAndEquipmentNet	$ 62,201us-gaap_PropertyPlantAndEquipmentNet
Minimum
Schedule of Investments [Line Items]
Estimated useful life	5 years
Maximum
Schedule of Investments [Line Items]
Estimated useful life	39 years

X

- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date of intangible assets related to Real Estate Investments having a reasonably expected period of economic benefit.

+ References

No definition available.

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- Definition

Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

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- Definition

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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- Definition

Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

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- Definition

Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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