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Segment and Non-Tariffed Business Reporting - Schedule of Segment Reporting Information, by Segment (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
reportingUnit
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
reportingUnit
Segment Reporting Information [Line Items]                  
Operating revenue $ 166,923     $ 165,863     $ 433,949 $ 428,826  
Operating expense 133,149     123,980     354,457 335,446  
Operating income (loss) 33,774     41,883     79,492 93,380  
Net income (loss) 19,068 $ 20,775 $ 2,616 26,093 $ 19,721 $ 2,417 42,459 48,231  
Depreciation and amortization 23,837     22,417     70,787 66,552  
Interest on long-term debt and other interest expense 13,535     13,174     40,655 39,638  
Provision (benefit) for income taxes 2,749     4,578     5,159 9,226  
Assets 3,469,741     3,259,714     $ 3,469,741 3,259,714 $ 3,311,465
Number of reporting units | reportingUnit             2   2
Water Utility Services | Regulated                  
Segment Reporting Information [Line Items]                  
Operating revenue 162,352     161,646     $ 421,985 416,085  
Operating expense 129,915     119,885     343,965 323,087  
Operating income (loss) 32,437     41,761     78,020 92,998  
Net income (loss) 20,625     25,053     46,909 53,117  
Depreciation and amortization 23,209     21,782     68,913 64,654  
Interest on long-term debt and other interest expense 8,805     8,112     25,323 24,575  
Provision (benefit) for income taxes 3,537     9,450     8,001 16,101  
Assets 3,352,976     3,131,778     3,352,976 3,131,778  
Water Utility Services | Non-tariffed                  
Segment Reporting Information [Line Items]                  
Operating revenue 3,168     2,814     7,897 8,524  
Operating expense 2,156     2,161     5,467 5,281  
Operating income (loss) 1,012     653     2,430 3,243  
Net income (loss) 879     827     2,278 3,178  
Depreciation and amortization 113     116     332 332  
Interest on long-term debt and other interest expense 0     0     0 0  
Provision (benefit) for income taxes 280     179     665 909  
Assets 7,141     8,589     7,141 8,589  
Real Estate Services | Non-tariffed                  
Segment Reporting Information [Line Items]                  
Operating revenue 1,403     1,403     4,067 4,217  
Operating expense 956     961     2,718 2,642  
Operating income (loss) 447     442     1,349 1,575  
Net income (loss) 294     310     913 1,141  
Depreciation and amortization 292     296     872 896  
Interest on long-term debt and other interest expense 0     0     0 0  
Provision (benefit) for income taxes 100     105     305 361  
Assets 44,629     45,980     44,629 45,980  
All Other | Non-tariffed                  
Segment Reporting Information [Line Items]                  
Operating revenue 0     0     0 0  
Operating expense 122     973     2,307 4,436  
Operating income (loss) (122)     (973)     (2,307) (4,436)  
Net income (loss) (2,730)     (97)     (7,641) (9,205)  
Depreciation and amortization 223     223     670 670  
Interest on long-term debt and other interest expense 4,730     5,062     15,332 15,063  
Provision (benefit) for income taxes (1,168)     (5,156)     (3,812) (8,145)  
Assets 64,995     73,367     64,995 73,367  
SJW Group | Regulated                  
Segment Reporting Information [Line Items]                  
Operating revenue 162,352     161,646     421,985 416,085  
Operating expense 129,915     119,885     343,965 323,087  
Operating income (loss) 32,437     41,761     78,020 92,998  
Net income (loss) 20,625     25,053     46,909 53,117  
Depreciation and amortization 23,209     21,782     68,913 64,654  
Interest on long-term debt and other interest expense 8,805     8,112     25,323 24,575  
Provision (benefit) for income taxes 3,537     9,450     8,001 16,101  
Assets 3,352,976     3,131,778     3,352,976 3,131,778  
SJW Group | Non-tariffed                  
Segment Reporting Information [Line Items]                  
Operating revenue 4,571     4,217     11,964 12,741  
Operating expense 3,234     4,095     10,492 12,359  
Operating income (loss) 1,337     122     1,472 382  
Net income (loss) (1,557)     1,040     (4,450) (4,886)  
Depreciation and amortization 628     635     1,874 1,898  
Interest on long-term debt and other interest expense 4,730     5,062     15,332 15,063  
Provision (benefit) for income taxes (788)     (4,872)     (2,842) (6,875)  
Assets $ 116,765     $ 127,936     $ 116,765 $ 127,936