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Segment and Non-Tariffed Business Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]              
Operating revenue $ 156,886   $ 149,041   $ 294,182 $ 273,343  
Operating expense 125,728   122,639   237,846 230,352  
Operating income (loss) 31,158   26,402   56,336 42,991  
Net income (loss) 18,286 $ 11,530 11,558 $ 3,737 29,816 15,295  
Depreciation and amortization 26,121   25,207   52,417 52,813  
Interest on long-term debt and other interest expense 16,397   14,241   32,169 27,970  
Provision (benefit) for income taxes (1,512)   2,368   (434) 3,435  
Assets 3,712,158   3,541,047   3,712,158 3,541,047 $ 3,632,624
Water Utility Services | Regulated              
Segment Reporting Information [Line Items]              
Operating revenue 152,525   144,261   285,797 264,779  
Operating expense 122,678   119,430   231,545 220,881  
Operating income (loss) 29,847   24,831   54,252 43,898  
Net income (loss) 20,510   12,765   33,732 22,480  
Depreciation and amortization 25,811   24,458   51,497 48,969  
Interest on long-term debt and other interest expense 10,846   9,805   21,393 18,568  
Provision (benefit) for income taxes 102   2,721   2,826 4,741  
Assets 3,605,238   3,435,758   3,605,238 3,435,758  
Water Utility Services | Non-tariffed              
Segment Reporting Information [Line Items]              
Operating revenue 2,945   3,414   5,522 5,842  
Operating expense 1,789   1,797   3,203 5,776  
Operating income (loss) 1,156   1,617   2,319 66  
Net income (loss) 596   1,768   1,214 451  
Depreciation and amortization 85   165   169 2,737  
Interest on long-term debt and other interest expense 0   0   0 0  
Provision (benefit) for income taxes 320   443   643 6  
Assets 4,480   4,220   4,480 4,220  
Real Estate Services | Non-tariffed              
Segment Reporting Information [Line Items]              
Operating revenue 1,416   1,366   2,863 2,722  
Operating expense 661   915   1,560 1,824  
Operating income (loss) 755   451   1,303 898  
Net income (loss) 544   323   969 631  
Depreciation and amortization 1   301   304 601  
Interest on long-term debt and other interest expense 0   (3)   0 (3)  
Provision (benefit) for income taxes 243   110   385 213  
Assets 43,714   44,033   43,714 44,033  
All Other | Non-tariffed              
Segment Reporting Information [Line Items]              
Operating revenue 0   0   0 0  
Operating expense 600   497   1,538 1,871  
Operating income (loss) (600)   (497)   (1,538) (1,871)  
Net income (loss) (3,364)   (3,298)   (6,099) (8,267)  
Depreciation and amortization 224   283   447 506  
Interest on long-term debt and other interest expense 5,551   4,439   10,776 9,405  
Provision (benefit) for income taxes (2,177)   (906)   (4,288) (1,525)  
Assets 58,726   57,036   58,726 57,036  
SJW Group | Regulated              
Segment Reporting Information [Line Items]              
Operating revenue 152,525   144,261   285,797 264,779  
Operating expense 122,678   119,430   231,545 220,881  
Operating income (loss) 29,847   24,831   54,252 43,898  
Net income (loss) 20,510   12,765   33,732 22,480  
Depreciation and amortization 25,811   24,458   51,497 48,969  
Interest on long-term debt and other interest expense 10,846   9,805   21,393 18,568  
Provision (benefit) for income taxes 102   2,721   2,826 4,741  
Assets 3,605,238   3,435,758   3,605,238 3,435,758  
SJW Group | Non-tariffed              
Segment Reporting Information [Line Items]              
Operating revenue 4,361   4,780   8,385 8,564  
Operating expense 3,050   3,209   6,301 9,471  
Operating income (loss) 1,311   1,571   2,084 (907)  
Net income (loss) (2,224)   (1,207)   (3,916) (7,185)  
Depreciation and amortization 310   749   920 3,844  
Interest on long-term debt and other interest expense 5,551   4,436   10,776 9,402  
Provision (benefit) for income taxes (1,614)   (353)   (3,260) (1,306)  
Assets $ 106,920   $ 105,289   $ 106,920 $ 105,289