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Segment and Non-Tariffed Business Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Operating revenue $ 149,382 $ 137,296  
Operating expense 121,469 112,118  
Operating income (loss) 27,913 25,178  
Net income (loss) 11,699 11,530  
Depreciation and amortization 28,370 26,296  
Interest on long-term debt and other interest expense 17,584 15,772  
Provision (benefit) for income taxes 2,231 1,078  
Total assets 4,367,512   $ 4,345,067
Water Utility Services      
Segment Reporting Information [Line Items]      
Total assets 4,271,112   4,242,704
Water Utility Services | Regulated      
Segment Reporting Information [Line Items]      
Operating revenue 144,915 133,272  
Operating expense 117,781 108,867  
Operating income (loss) 27,134 24,405  
Net income (loss) 14,600 13,222  
Depreciation and amortization 28,061 25,686  
Interest on long-term debt and other interest expense 11,542 10,547  
Provision (benefit) for income taxes 3,696 2,724  
Total assets 4,228,675   4,199,172
Water Utility Services | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 2,692 2,577  
Operating expense 1,610 1,414  
Operating income (loss) 1,082 1,163  
Net income (loss) 732 618  
Depreciation and amortization 85 84  
Interest on long-term debt and other interest expense 221 0  
Provision (benefit) for income taxes 318 323  
Total assets 42,437   43,532
Real Estate Services | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 1,775 1,447  
Operating expense 726 899  
Operating income (loss) 1,049 548  
Net income (loss) 783 425  
Depreciation and amortization 1 303  
Interest on long-term debt and other interest expense 0 0  
Provision (benefit) for income taxes 266 142  
Total assets 43,506   44,222
All Other | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 0 0  
Operating expense 1,352 938  
Operating income (loss) (1,352) (938)  
Net income (loss) (4,416) (2,735)  
Depreciation and amortization 223 223  
Interest on long-term debt and other interest expense 5,821 5,225  
Provision (benefit) for income taxes (2,049) (2,111)  
Total assets 52,894   58,141
SJW Group | Regulated      
Segment Reporting Information [Line Items]      
Operating revenue 144,915 133,272  
Operating expense 117,781 108,867  
Operating income (loss) 27,134 24,405  
Net income (loss) 14,600 13,222  
Depreciation and amortization 28,061 25,686  
Interest on long-term debt and other interest expense 11,542 10,547  
Provision (benefit) for income taxes 3,696 2,724  
Total assets 4,228,675   4,199,172
SJW Group | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 4,467 4,024  
Operating expense 3,688 3,251  
Operating income (loss) 779 773  
Net income (loss) (2,901) (1,692)  
Depreciation and amortization 309 610  
Interest on long-term debt and other interest expense 6,042 5,225  
Provision (benefit) for income taxes (1,465) $ (1,646)  
Total assets $ 138,837   $ 145,895