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Long-Term Debt Narrative (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Unamortized Debt Issuance Expense	$ (3,576,000)	$ (3,908,000)
Long-term debt	435,000,000	435,000,000
Restricted Cash and Cash Equivalents	0	0	$ 19,001,000
Significant Observable Inputs (Level 2)
Fair value of long-term debt	490,148,000	537,646,000
Senior Notes [Member]
Long-term debt	315,000,000	315,000,000
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds Two [Member]
Long-term debt	$ 70,000,000	70,000,000
Stated interest rates	4.75%
San Jose Water Company [Member] | Senior Notes [Member]
Ratio of indebtedness to total capital	0.6666
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges	1.75
San Jose Water Company [Member] | Senior Notes [Member] | Series A [Member]
Long-term debt	$ 20,000,000	20,000,000
Stated interest rates	8.58%
San Jose Water Company [Member] | Senior Notes [Member] | Series L [Member]
Long-term debt	$ 50,000,000	50,000,000
Stated interest rates	5.14%
SJW Group [Member] | Senior Notes [Member] | Series A [Member]
Long-term debt	$ 50,000,000	50,000,000
Stated interest rates	4.35%
Ratio of indebtedness to total capital	0.6666
Minimum net worth required for compliance	$ 175,000,000
Cumulative net income, percentage included in net worth for compliance	30.00%
SJW Group [Member] | Senior Notes [Member] | Series A [Member] | Financial Guarantee [Member]
Ratio of indebtedness to total capital	0.6666
Minimum net worth required for compliance	$ 125,000,000
SJW Group [Member] | Senior Notes [Member] | Series A [Member] | Financial Guarantee [Member] | Minimum [Member]
Cumulative net income, percentage included in net worth for compliance	30.00%
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Senior Notes [Member] | Series A [Member]
Long-term debt	$ 15,000,000	$ 15,000,000
Stated interest rates	6.27%
Ratio of indebtedness to total capital	0.6666
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges	1.75

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