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Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Utility plant:
Land	$ 16,838us-gaap_PublicUtilitiesPropertyPlantAndEquipmentLand	$ 16,838us-gaap_PublicUtilitiesPropertyPlantAndEquipmentLand
Depreciable plant and equipment	1,369,521us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1,353,772us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Construction in progress	29,221us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	23,208us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Intangible assets	20,324us-gaap_FiniteLivedIntangibleAssetsGross	19,333us-gaap_FiniteLivedIntangibleAssetsGross
Property, Plant and Equipment, Gross	1,435,904us-gaap_PropertyPlantAndEquipmentGross	1,413,151us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization	458,538us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	450,137us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Public Utilities, Property, Plant and Equipment, Net	977,366us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet	963,014us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Real estate investments	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
CURRENT ASSETS:
Cash and cash equivalents	5,417us-gaap_CashAndCashEquivalentsAtCarryingValue	2,399us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable:
Customers, net of allowances for uncollectible accounts	17,574us-gaap_AccountsReceivableNetCurrent	14,997us-gaap_AccountsReceivableNetCurrent
Income tax	1,251us-gaap_IncomeTaxesReceivable	8,871us-gaap_IncomeTaxesReceivable
Other	3,027us-gaap_NontradeReceivablesCurrent	3,385us-gaap_NontradeReceivablesCurrent
Accrued unbilled utility revenue	16,090us-gaap_ReceivablesLongTermContractsOrPrograms	18,074us-gaap_ReceivablesLongTermContractsOrPrograms
Materials and supplies	1,250us-gaap_PublicUtilitiesInventory	1,214us-gaap_PublicUtilitiesInventory
Prepaid expenses	2,543us-gaap_PrepaidExpenseCurrent	2,300us-gaap_PrepaidExpenseCurrent
Current regulatory asset, net	15,996us-gaap_RegulatoryAssetsCurrent	16,853us-gaap_RegulatoryAssetsCurrent
Assets, Current	63,148us-gaap_AssetsCurrent	68,093us-gaap_AssetsCurrent
OTHER ASSETS:
Investment in California Water Service Group	6,352us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent	6,378us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent
Unamortized debt issuance, broker and reacquisition costs	5,094sjw_UnamortizedDebtIssuanceExpenseAndBrokerFees	5,218sjw_UnamortizedDebtIssuanceExpenseAndBrokerFees
Net regulatory assets, less current portion	157,449us-gaap_RegulatoryAssetsNoncurrent	158,010us-gaap_RegulatoryAssetsNoncurrent
Other	6,542us-gaap_OtherAssetsNoncurrent	6,390us-gaap_OtherAssetsNoncurrent
Assets, Noncurrent	175,437us-gaap_AssetsNoncurrent	175,996us-gaap_AssetsNoncurrent
Assets	1,277,821us-gaap_Assets	1,269,304us-gaap_Assets
Shareholders' equity:
Common stock, $0.521 par value; authorized 36,000,000 shares; issued and outstanding 20,341,489 shares on March 31, 2015 and 20,286,840 on December 31, 2014	10,595us-gaap_CommonStockValue	10,567us-gaap_CommonStockValue
Additional paid-in capital	66,885us-gaap_AdditionalPaidInCapitalCommonStock	66,298us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings	281,473us-gaap_RetainedEarningsAccumulatedDeficit	280,773us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income	2,502us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	2,517us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total shareholders' equity	361,455us-gaap_StockholdersEquity	360,155us-gaap_StockholdersEquity
Long-term debt, less current portion	384,189us-gaap_LongTermDebtNoncurrent	384,365us-gaap_LongTermDebtNoncurrent
Capitalization, Long-term Debt and Equity	745,644us-gaap_CapitalizationLongtermDebtAndEquity	744,520us-gaap_CapitalizationLongtermDebtAndEquity
CURRENT LIABILITIES:
Line of credit	11,700us-gaap_LinesOfCreditCurrent	13,200us-gaap_LinesOfCreditCurrent
Current portion of long-term debt	613us-gaap_LongTermDebtCurrent	584us-gaap_LongTermDebtCurrent
Accrued groundwater extraction charges and purchased water	6,159sjw_AccruedGroundwaterExtractionChargesAndPurchasedWater	5,411sjw_AccruedGroundwaterExtractionChargesAndPurchasedWater
Purchased power	568sjw_PurchasedPower	619sjw_PurchasedPower
Accounts payable	11,776us-gaap_AccountsPayableCurrent	7,001us-gaap_AccountsPayableCurrent
Accrued interest	5,750us-gaap_InterestPayableCurrent	6,361us-gaap_InterestPayableCurrent
Accrued property taxes and other non-income taxes	2,635us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent	1,607us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Accrued payroll	3,474us-gaap_EmployeeRelatedLiabilitiesCurrent	3,755us-gaap_EmployeeRelatedLiabilitiesCurrent
Other current liabilities	5,977us-gaap_OtherLiabilitiesCurrent	6,156us-gaap_OtherLiabilitiesCurrent
Liabilities, Current	48,652us-gaap_LiabilitiesCurrent	44,694us-gaap_LiabilitiesCurrent
DEFERRED INCOME TAXES	186,232us-gaap_DeferredTaxLiabilitiesNoncurrent	185,506us-gaap_DeferredTaxLiabilitiesNoncurrent
UNAMORTIZED INVESTMENT TAX CREDITS	1,300us-gaap_AccumulatedDeferredInvestmentTaxCredit	1,315us-gaap_AccumulatedDeferredInvestmentTaxCredit
ADVANCES FOR CONSTRUCTION	74,111us-gaap_CustomerAdvancesForConstruction	73,303us-gaap_CustomerAdvancesForConstruction
CONTRIBUTIONS IN AID OF CONSTRUCTION	138,195us-gaap_ContributionsInAidOfConstruction	138,502us-gaap_ContributionsInAidOfConstruction
DEFERRED REVENUE	1,328us-gaap_DeferredRevenue	1,323us-gaap_DeferredRevenue
POSTRETIREMENT BENEFIT PLANS	76,476us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	74,187us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
OTHER NONCURRENT LIABILITIES	5,883us-gaap_OtherLiabilitiesNoncurrent	5,954us-gaap_OtherLiabilitiesNoncurrent
COMMITMENTS AND CONTINGENCIES	0us-gaap_CommitmentsAndContingencies	0us-gaap_CommitmentsAndContingencies
Liabilities and Equity	$ 1,277,821us-gaap_LiabilitiesAndStockholdersEquity	$ 1,269,304us-gaap_LiabilitiesAndStockholdersEquity

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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.

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Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility.

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Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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