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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
OPERATING REVENUE	$ 62,112us-gaap_RegulatedOperatingRevenue	$ 54,596us-gaap_RegulatedOperatingRevenue
Production Expenses:
Purchased water	9,284us-gaap_CostOfPurchasedWater	9,730us-gaap_CostOfPurchasedWater
Power	1,172us-gaap_UtilitiesOperatingExpensePurchasedPower	1,489us-gaap_UtilitiesOperatingExpensePurchasedPower
Groundwater extraction charges	7,936sjw_GroundwaterExtractionCharges	9,448sjw_GroundwaterExtractionCharges
Other production expenses	2,997us-gaap_UtilitiesOperatingExpenseOther	2,862us-gaap_UtilitiesOperatingExpenseOther
Total production expenses	21,389us-gaap_WaterProductionCosts	23,529us-gaap_WaterProductionCosts
Administrative and general	11,296us-gaap_GeneralAndAdministrativeExpense	9,450us-gaap_GeneralAndAdministrativeExpense
Maintenance	3,368us-gaap_UtilitiesOperatingExpenseMaintenance	3,274us-gaap_UtilitiesOperatingExpenseMaintenance
Property taxes and other non-income taxes	3,095us-gaap_UtilitiesOperatingExpenseTaxes	2,804us-gaap_UtilitiesOperatingExpenseTaxes
Depreciation and amortization	10,159us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization	9,485us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Total operating expense	49,307us-gaap_UtilitiesOperatingExpense	48,542us-gaap_UtilitiesOperatingExpense
OPERATING INCOME	12,805us-gaap_OperatingIncomeLoss	6,054us-gaap_OperatingIncomeLoss
OTHER (EXPENSE) INCOME:
Interest on long-term debt	(5,339)us-gaap_InterestExpenseDebt	(4,542)us-gaap_InterestExpenseDebt
Mortgage and other interest expense	(313)us-gaap_InterestExpenseOther	(328)us-gaap_InterestExpenseOther
Dividend income	43us-gaap_InvestmentIncomeDividend	63us-gaap_InvestmentIncomeDividend
Other, net	293us-gaap_OtherNonoperatingIncomeExpense	220us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	7,489us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1,467us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	2,794us-gaap_IncomeTaxExpenseBenefit	561us-gaap_IncomeTaxExpenseBenefit
NET INCOME	4,695us-gaap_NetIncomeLoss	906us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:
Unrealized income (loss) on investment	(15)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	198us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
COMPREHENSIVE INCOME	$ 4,680us-gaap_ComprehensiveIncomeNetOfTax	$ 1,104us-gaap_ComprehensiveIncomeNetOfTax
EARNINGS PER SHARE
Basic (usd per share)	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic
Diluted (usd per share)	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted
DIVIDENDS PER SHARE (usd per share)	$ 0.20us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (shares)	20,326,897us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	20,194,851us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (shares)	20,480,276us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	20,385,271us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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Aggregate dividends declared during the period for each share of common stock outstanding.

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