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California Water Service Group Stock Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Available for Sale Marketable Security, Shares Sold | 125,969sjw_AvailableForSaleMarketableSecuritySharesSold |  |  |
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $ 3,056us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds |  |  |
Fees Incurred on Sale of Available for Sale Securities | 10sjw_FeesIncurredOnSaleOfAvailableForSaleSecurities |  |  |
Available-for-sale Securities, Gross Realized Gain (Loss) | 2,017us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 2,017us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Available for Sales Securities, Tax on Realized Gain | 822sjw_AvailableForSalesSecuritiesTaxOnRealizedGain |  |  |
Gain (Loss) on Sale of Securities, Net | 1,195us-gaap_GainLossOnSaleOfSecuritiesNet |  |  |
Reclassification adjustment from AOCI for sale of securities, net | 1,171us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | 1,171us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Shares of California Water Service Group held |  | 259,151sjw_AvailableForSaleMarketableSecuritySharesHeld |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Investment in California Water Service Group |  | $ 6,378us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | $ 8,885us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |

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