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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:        
Advances and contributions   $ 16,212sjw_DeferredTaxAssetsAdvancesAndContributions $ 15,598sjw_DeferredTaxAssetsAdvancesAndContributions  
Unamortized investment tax credit   709us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness 741us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness  
Pensions and postretirement benefits   4,216sjw_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndPostretirementBenefits 4,405sjw_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndPostretirementBenefits  
California franchise tax   0us-gaap_DeferredTaxAssetsStateTaxes 1,107us-gaap_DeferredTaxAssetsStateTaxes  
Net operating loss   5,065us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 5,814us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Other   1,697us-gaap_DeferredTaxAssetsOther 1,596us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets   27,899us-gaap_DeferredTaxAssetsGross 29,261us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities:        
Utility plant   150,662us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 125,706us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Pension and postretirement benefits   47,059sjw_DeferredTaxLiabilitiesPensionAndPostretirementBenefits 25,649sjw_DeferredTaxLiabilitiesPensionAndPostretirementBenefits  
Investment in stock   2,335us-gaap_DeferredTaxLiabilitiesInvestments 3,228us-gaap_DeferredTaxLiabilitiesInvestments  
Deferred gain and other-property related   11,695sjw_DeferredTaxLiabilitiesDeferredGainAndOtherPropertyRelated 13,107sjw_DeferredTaxLiabilitiesDeferredGainAndOtherPropertyRelated  
Debt reacquisition costs   443us-gaap_DeferredTaxLiabilitiesFinancingArrangements 496us-gaap_DeferredTaxLiabilitiesFinancingArrangements  
Other   1,211us-gaap_DeferredTaxLiabilitiesOther 1,811us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities   213,405us-gaap_DeferredIncomeTaxLiabilities 169,997us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax liabilities   185,506us-gaap_DeferredTaxLiabilitiesNoncurrent 140,736us-gaap_DeferredTaxLiabilitiesNoncurrent  
Income Tax Credits and Adjustments 880us-gaap_IncomeTaxCreditsAndAdjustments      
Provision for income taxes   24,971us-gaap_IncomeTaxExpenseBenefit 14,135us-gaap_IncomeTaxExpenseBenefit 15,542us-gaap_IncomeTaxExpenseBenefit
Federal        
Deferred tax liabilities:        
Net operating loss carryforward   14,051us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Operating loss carryforward as reported on tax return   15,603sjw_OperatingLossCarryforwardasReportedonTaxReturn
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
State and Local Jurisdiction [Member]        
Deferred tax liabilities:        
Income Tax Credits and Adjustments   77,999us-gaap_IncomeTaxCreditsAndAdjustments
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Operating loss carryforward as reported on tax return   1,659sjw_OperatingLossCarryforwardasReportedonTaxReturn
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Provision for income taxes   4,482us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Domestic Tax Authority [Member]        
Deferred tax liabilities:        
Other   12,569us-gaap_DeferredTaxLiabilitiesOther
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
Income Tax Credits and Adjustments   35,912us-gaap_IncomeTaxCreditsAndAdjustments
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
2014 Federal and State Repairs and Maintenance Deduction [Member]        
Deferred tax liabilities:        
Income Tax Credits and Adjustments   11,221us-gaap_IncomeTaxCreditsAndAdjustments
/ us-gaap_TaxCreditCarryforwardAxis
= sjw_A2014FederalandStateRepairsandMaintenanceDeductionMember		    
2014 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction [Member]        
Deferred tax liabilities:        
Provision for income taxes   (645)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxCreditCarryforwardAxis
= sjw_A2014FederalandStateRepairsandMaintenanceDeductionMember		    
2014 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority [Member]        
Deferred tax liabilities:        
Other   $ 3,927us-gaap_DeferredTaxLiabilitiesOther
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= sjw_A2014FederalandStateRepairsandMaintenanceDeductionMember