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Segment and Non-Tariffed Business Reporting - Schedule of Segment Reporting Information, by Segment (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
reportingUnit
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
reportingUnit
Segment Reporting Information [Line Items]              
Operating revenue $ 152,241   $ 147,209   $ 267,026 $ 262,963  
Operating expense 119,602   111,139   221,308 211,466  
Operating income (loss) 32,639   36,070   45,718 51,497  
Net income (loss) 20,775 $ 2,616 19,721 $ 2,417 23,391 22,138  
Depreciation and amortization 23,512   22,753   46,950 44,135  
Interest on long-term debt and other interest expense 13,681   13,180   27,120 26,464  
Provision (benefit) for income taxes 3,306   4,210   2,410 4,648  
Assets 3,409,522   3,209,977   $ 3,409,522 3,209,977 $ 3,311,465
Number of reporting units | reportingUnit         2   2
Water Utility Services | Regulated              
Segment Reporting Information [Line Items]              
Operating revenue 148,237   143,072   $ 259,633 254,439  
Operating expense 115,572   107,185   214,050 203,202  
Operating income (loss) 32,665   35,887   45,583 51,237  
Net income (loss) 20,585   22,236   26,284 28,064  
Depreciation and amortization 22,887   22,123   45,704 42,872  
Interest on long-term debt and other interest expense 8,347   8,289   16,518 16,463  
Provision (benefit) for income taxes 4,580   5,449   4,464 6,651  
Assets 3,300,414   3,079,118   3,300,414 3,079,118  
Water Utility Services | Non-tariffed              
Segment Reporting Information [Line Items]              
Operating revenue 2,684   2,693   4,729 5,710  
Operating expense 1,942   1,759   3,311 3,120  
Operating income (loss) 742   934   1,418 2,590  
Net income (loss) 677   881   1,399 2,351  
Depreciation and amortization 110   108   219 216  
Interest on long-term debt and other interest expense 0   0   0 0  
Provision (benefit) for income taxes 203   260   385 730  
Assets 8,248   9,913   8,248 9,913  
Real Estate Services | Non-tariffed              
Segment Reporting Information [Line Items]              
Operating revenue 1,320   1,444   2,664 2,814  
Operating expense 881   850   1,762 1,681  
Operating income (loss) 439   594   902 1,133  
Net income (loss) 296   443   619 831  
Depreciation and amortization 291   298   580 600  
Interest on long-term debt and other interest expense 0   0   0 0  
Provision (benefit) for income taxes 96   124   205 256  
Assets 45,090   44,889   45,090 44,889  
All Other | Non-tariffed              
Segment Reporting Information [Line Items]              
Operating revenue 0   0   0 0  
Operating expense 1,207   1,345   2,185 3,463  
Operating income (loss) (1,207)   (1,345)   (2,185) (3,463)  
Net income (loss) (783)   (3,839)   (4,911) (9,108)  
Depreciation and amortization 224   224   447 447  
Interest on long-term debt and other interest expense 5,334   4,891   10,602 10,001  
Provision (benefit) for income taxes (1,573)   (1,623)   (2,644) (2,989)  
Assets 55,770   76,057   55,770 76,057  
SJW Group | Regulated              
Segment Reporting Information [Line Items]              
Operating revenue 148,237   143,072   259,633 254,439  
Operating expense 115,572   107,185   214,050 203,202  
Operating income (loss) 32,665   35,887   45,583 51,237  
Net income (loss) 20,585   22,236   26,284 28,064  
Depreciation and amortization 22,887   22,123   45,704 42,872  
Interest on long-term debt and other interest expense 8,347   8,289   16,518 16,463  
Provision (benefit) for income taxes 4,580   5,449   4,464 6,651  
Assets 3,300,414   3,079,118   3,300,414 3,079,118  
SJW Group | Non-tariffed              
Segment Reporting Information [Line Items]              
Operating revenue 4,004   4,137   7,393 8,524  
Operating expense 4,030   3,954   7,258 8,264  
Operating income (loss) (26)   183   135 260  
Net income (loss) 190   (2,515)   (2,893) (5,926)  
Depreciation and amortization 625   630   1,246 1,263  
Interest on long-term debt and other interest expense 5,334   4,891   10,602 10,001  
Provision (benefit) for income taxes (1,274)   (1,239)   (2,054) (2,003)  
Assets $ 109,108   $ 130,859   $ 109,108 $ 130,859