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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, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Operating revenue $ 137,296 $ 124,302  
Operating expense 112,118 107,713  
Operating income (loss) 25,178 16,589  
Net income (loss) 11,530 3,737  
Depreciation and amortization 26,296 27,606  
Interest on long-term debt and other interest expense 15,772 13,729  
Provision (benefit) for income taxes 1,078 1,067  
Assets 3,652,498 3,511,876 $ 3,632,624
Water Utility Services | Regulated      
Segment Reporting Information [Line Items]      
Operating revenue 133,272 120,518  
Operating expense 108,867 101,451  
Operating income (loss) 24,405 19,067  
Net income (loss) 13,222 9,715  
Depreciation and amortization 25,686 24,511  
Interest on long-term debt and other interest expense 10,547 8,763  
Provision (benefit) for income taxes 2,724 2,020  
Assets 3,552,767 3,403,006  
Water Utility Services | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 2,577 2,428  
Operating expense 1,414 3,979  
Operating income (loss) 1,163 (1,551)  
Net income (loss) 618 (1,317)  
Depreciation and amortization 84 2,572  
Interest on long-term debt and other interest expense 0 0  
Provision (benefit) for income taxes 323 (437)  
Assets 3,967 4,139  
Real Estate Services | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 1,447 1,356  
Operating expense 899 909  
Operating income (loss) 548 447  
Net income (loss) 425 308  
Depreciation and amortization 303 300  
Interest on long-term debt and other interest expense 0 0  
Provision (benefit) for income taxes 142 103  
Assets 43,660 44,361  
All Other | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 0 0  
Operating expense 938 1,374  
Operating income (loss) (938) (1,374)  
Net income (loss) (2,735) (4,969)  
Depreciation and amortization 223 223  
Interest on long-term debt and other interest expense 5,225 4,966  
Provision (benefit) for income taxes (2,111) (619)  
Assets 52,104 60,370  
SJW Group | Regulated      
Segment Reporting Information [Line Items]      
Operating revenue 133,272 120,518  
Operating expense 108,867 101,451  
Operating income (loss) 24,405 19,067  
Net income (loss) 13,222 9,715  
Depreciation and amortization 25,686 24,511  
Interest on long-term debt and other interest expense 10,547 8,763  
Provision (benefit) for income taxes 2,724 2,020  
Assets 3,552,767 3,403,006  
SJW Group | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 4,024 3,784  
Operating expense 3,251 6,262  
Operating income (loss) 773 (2,478)  
Net income (loss) (1,692) (5,978)  
Depreciation and amortization 610 3,095  
Interest on long-term debt and other interest expense 5,225 4,966  
Provision (benefit) for income taxes (1,646) (953)  
Assets $ 99,731 $ 108,870