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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, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2022
USD ($)
reporting_unit
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
reporting_unit
Segment Reporting Information [Line Items]                  
Operating revenue $ 175,981     $ 166,923     $ 449,324 $ 433,949  
Operating expense 138,379     133,149     368,731 354,457  
Operating income (loss) 37,602     33,774     80,593 79,492  
Net income (loss) 25,034 $ 11,558 $ 3,737 19,068 $ 20,775 $ 2,616 40,329 42,459  
Depreciation and amortization 25,529     23,837     78,342 70,787  
Interest on long-term debt and other interest expense 14,190     13,535     42,160 40,655  
Provision (benefit) for income taxes 223     2,749     3,658 5,159  
Assets 3,604,704     3,469,741     $ 3,604,704 3,469,741 $ 3,492,395
Number of reporting units | reporting_unit             2   2
Water Utility Services | Regulated                  
Segment Reporting Information [Line Items]                  
Operating revenue 171,044     162,352     $ 435,823 421,985  
Operating expense 134,739     129,915     355,620 343,965  
Operating income (loss) 36,305     32,437     80,203 78,020  
Net income (loss) 29,176     20,625     51,656 46,909  
Depreciation and amortization 24,919     23,209     73,888 68,913  
Interest on long-term debt and other interest expense 9,111     8,805     27,676 25,323  
Provision (benefit) for income taxes 103     3,537     4,844 8,001  
Assets 3,498,396     3,352,976     3,498,396 3,352,976  
Water Utility Services | Non-tariffed                  
Segment Reporting Information [Line Items]                  
Operating revenue 3,463     3,168     9,305 7,897  
Operating expense 2,092     2,156     7,868 5,467  
Operating income (loss) 1,371     1,012     1,437 2,430  
Net income (loss) (10)     879     441 2,278  
Depreciation and amortization 84     113     2,821 332  
Interest on long-term debt and other interest expense 0     0     0 0  
Provision (benefit) for income taxes 392     280     398 665  
Assets 5,302     7,141     5,302 7,141  
Real Estate Services | Non-tariffed                  
Segment Reporting Information [Line Items]                  
Operating revenue 1,474     1,403     4,196 4,067  
Operating expense 975     956     2,799 2,718  
Operating income (loss) 499     447     1,397 1,349  
Net income (loss) 367     294     998 913  
Depreciation and amortization 302     292     903 872  
Interest on long-term debt and other interest expense 0     0     0 0  
Provision (benefit) for income taxes 128     100     341 305  
Assets 43,017     44,629     43,017 44,629  
All Other | Non-tariffed                  
Segment Reporting Information [Line Items]                  
Operating revenue 0     0     0 0  
Operating expense 573     122     2,444 2,307  
Operating income (loss) (573)     (122)     (2,444) (2,307)  
Net income (loss) (4,499)     (2,730)     (12,766) (7,641)  
Depreciation and amortization 224     223     730 670  
Interest on long-term debt and other interest expense 5,079     4,730     14,484 15,332  
Provision (benefit) for income taxes (400)     (1,168)     (1,925) (3,812)  
Assets 57,989     64,995     57,989 64,995  
SJW Group | Regulated                  
Segment Reporting Information [Line Items]                  
Operating revenue 171,044     162,352     435,823 421,985  
Operating expense 134,739     129,915     355,620 343,965  
Operating income (loss) 36,305     32,437     80,203 78,020  
Net income (loss) 29,176     20,625     51,656 46,909  
Depreciation and amortization 24,919     23,209     73,888 68,913  
Interest on long-term debt and other interest expense 9,111     8,805     27,676 25,323  
Provision (benefit) for income taxes 103     3,537     4,844 8,001  
Assets 3,498,396     3,352,976     3,498,396 3,352,976  
SJW Group | Non-tariffed                  
Segment Reporting Information [Line Items]                  
Operating revenue 4,937     4,571     13,501 11,964  
Operating expense 3,640     3,234     13,111 10,492  
Operating income (loss) 1,297     1,337     390 1,472  
Net income (loss) (4,142)     (1,557)     (11,327) (4,450)  
Depreciation and amortization 610     628     4,454 1,874  
Interest on long-term debt and other interest expense 5,079     4,730     14,484 15,332  
Provision (benefit) for income taxes 120     (788)     (1,186) (2,842)  
Assets $ 106,308     $ 116,765     $ 106,308 $ 116,765