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Unaudited Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating revenue	$ 69,286us-gaap_RegulatedOperatingRevenue	$ 125,430us-gaap_RegulatedOperatingRevenue	$ 70,356us-gaap_RegulatedOperatingRevenue	$ 54,596us-gaap_RegulatedOperatingRevenue	$ 67,262us-gaap_RegulatedOperatingRevenue	$ 85,238us-gaap_RegulatedOperatingRevenue	$ 74,230us-gaap_RegulatedOperatingRevenue	$ 50,139us-gaap_RegulatedOperatingRevenue	$ 319,668us-gaap_RegulatedOperatingRevenue	$ 276,869us-gaap_RegulatedOperatingRevenue	$ 261,547us-gaap_RegulatedOperatingRevenue
Operating Income (Loss)	15,589us-gaap_OperatingIncomeLoss	59,114us-gaap_OperatingIncomeLoss	12,121us-gaap_OperatingIncomeLoss	6,054us-gaap_OperatingIncomeLoss	11,351us-gaap_OperatingIncomeLoss	19,346us-gaap_OperatingIncomeLoss	16,937us-gaap_OperatingIncomeLoss	5,773us-gaap_OperatingIncomeLoss	92,878us-gaap_OperatingIncomeLoss	53,407us-gaap_OperatingIncomeLoss	55,297us-gaap_OperatingIncomeLoss
Net income	5,688us-gaap_NetIncomeLoss	38,366us-gaap_NetIncomeLoss	6,846us-gaap_NetIncomeLoss	906us-gaap_NetIncomeLoss	4,677us-gaap_NetIncomeLoss	8,950us-gaap_NetIncomeLoss	7,440us-gaap_NetIncomeLoss	1,317us-gaap_NetIncomeLoss	51,806us-gaap_NetIncomeLoss	22,384us-gaap_NetIncomeLoss	22,318us-gaap_NetIncomeLoss
Comprehensive income	$ 6,021us-gaap_ComprehensiveIncomeNetOfTax	$ 38,095us-gaap_ComprehensiveIncomeNetOfTax	$ 5,716us-gaap_ComprehensiveIncomeNetOfTax	$ 1,104us-gaap_ComprehensiveIncomeNetOfTax	$ 5,304us-gaap_ComprehensiveIncomeNetOfTax	$ 9,135us-gaap_ComprehensiveIncomeNetOfTax	$ 7,351us-gaap_ComprehensiveIncomeNetOfTax	$ 1,671us-gaap_ComprehensiveIncomeNetOfTax	$ 50,936us-gaap_ComprehensiveIncomeNetOfTax	$ 23,461us-gaap_ComprehensiveIncomeNetOfTax	$ 22,354us-gaap_ComprehensiveIncomeNetOfTax
Earnings per share
—Basic (in dollars per share)	$ 0.28us-gaap_EarningsPerShareBasic	$ 1.90us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 2.56us-gaap_EarningsPerShareBasic	$ 1.13us-gaap_EarningsPerShareBasic	$ 1.20us-gaap_EarningsPerShareBasic
—Diluted (in dollars per share)	$ 0.28us-gaap_EarningsPerShareDiluted	$ 1.88us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ 2.54us-gaap_EarningsPerShareDiluted	$ 1.12us-gaap_EarningsPerShareDiluted	$ 1.18us-gaap_EarningsPerShareDiluted
Dividends per share	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.18us-gaap_CommonStockDividendsPerShareDeclared	$ 0.18us-gaap_CommonStockDividendsPerShareDeclared	$ 0.18us-gaap_CommonStockDividendsPerShareDeclared	$ 0.18us-gaap_CommonStockDividendsPerShareDeclared
--- High (in dollars per share) [Member]
Earnings per share
Market Price, Stock	$ 32.87sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 28.25sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 29.51sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 30.40sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 30.03sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 28.52sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 27.66sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 28.09sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MaximumMember
--- Low (in dollars per share) [Member]
Earnings per share
Market Price, Stock	$ 26.77sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 25.64sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 25.87sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 27.84sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 26.40sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 25.62sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 24.58sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 25.70sjw_MarketPriceStock / us-gaap_RangeAxis = us-gaap_MinimumMember

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