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California Water Service Group Stock	12 Months Ended
California Water Service Group Stock	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
California Water Service Group Stock	California Water Service Group Stock SJW Group classifies its investment in California Water Service Group as available-for-sale. As of December 31, 2017, SJW Group held 100,000 shares of California Water Service Group. The stock is carried at quoted market price with changes in unrealized gain or loss reported, net of tax, as a component of other comprehensive income. During the quarter ended June 30, 2016, SJW Group sold 159,151 shares of California Water Service Group for $4,510, before fees of $20. SJW Group recognized a gain on the sale of the stock of approximately $3,197 and tax expense of approximately $1,303, for a net gain of $1,894. The unrealized holding gain associated with the shares sold, that was reclassified out of accumulated other comprehensive income was $1,742 and was based on the fair value of the stock as of June 30, 2016. As of December 31, 2017 and 2016, fair value of the Company’s investment in California Water Service Group was $4,535 and $3,390, respectively, and would be categorized as Level 1 of the fair value hierarchy.