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California Water Service Group Stock California Water Service Group Stock	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
California Water Service Group Stock	California Water Service Group Stock During the quarter ended March 31, 2018, SJW Group sold 17,660 shares of California Water Service Group for $716, before fees of $2. SJW Group recognized a loss on the sale of the stock of approximately $87 and tax benefit of approximately $24, for a net loss of $63. As of June 30, 2018, SJW Group held 82,340 shares of California Water Service Group remaining. The company classifies its investment in California Water Service Group as available for sale. The stock is carried at the quoted market price with the changes in gain or loss reported as a component of other expense (income) on the Consolidated Statements of Comprehensive Income.