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Segment and Non-Tariffed Business Reporting - Schedule of Segment Reporting Information, by Segment (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
reportingUnit
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
reportingUnit
Segment Reporting Information [Line Items]      
Operating revenue $ 114,785 $ 115,754  
Operating expense 101,706 100,327  
Operating income (loss) 13,079 15,427  
Net income (loss) 2,616 2,417  
Depreciation and amortization 23,438 21,382  
Interest on long-term debt and other interest expense 13,439 13,284  
(Benefit) provision for income taxes (896) 438  
Assets $ 3,332,142 3,174,298 $ 3,311,465
Number of reporting units | reportingUnit 2   2
Water Utility Services | Regulated      
Segment Reporting Information [Line Items]      
Operating revenue $ 111,396 111,367  
Operating expense 98,478 96,017  
Operating income (loss) 12,918 15,350  
Net income (loss) 5,699 5,828  
Depreciation and amortization 22,817 20,749  
Interest on long-term debt and other interest expense 8,171 8,174  
(Benefit) provision for income taxes (116) 1,202  
Assets 3,218,536 3,054,474  
Water Utility Services | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 2,045 3,017  
Operating expense 1,369 1,361  
Operating income (loss) 676 1,656  
Net income (loss) 722 1,470  
Depreciation and amortization 109 108  
Interest on long-term debt and other interest expense 0 0  
(Benefit) provision for income taxes 182 470  
Assets 7,625 9,170  
Real Estate Services | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 1,344 1,370  
Operating expense 881 831  
Operating income (loss) 463 539  
Net income (loss) 323 388  
Depreciation and amortization 289 302  
Interest on long-term debt and other interest expense 0 0  
(Benefit) provision for income taxes 109 132  
Assets 44,763 46,436  
All Other | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 0 0  
Operating expense 978 2,118  
Operating income (loss) (978) (2,118)  
Net income (loss) (4,128) (5,269)  
Depreciation and amortization 223 223  
Interest on long-term debt and other interest expense 5,268 5,110  
(Benefit) provision for income taxes (1,071) (1,366)  
Assets 61,218 64,218  
SJW Group | Regulated      
Segment Reporting Information [Line Items]      
Operating revenue 111,396 111,367  
Operating expense 98,478 96,017  
Operating income (loss) 12,918 15,350  
Net income (loss) 5,699 5,828  
Depreciation and amortization 22,817 20,749  
Interest on long-term debt and other interest expense 8,171 8,174  
(Benefit) provision for income taxes (116) 1,202  
Assets 3,218,536 3,054,474  
SJW Group | Non-tariffed      
Segment Reporting Information [Line Items]      
Operating revenue 3,389 4,387  
Operating expense 3,228 4,310  
Operating income (loss) 161 77  
Net income (loss) (3,083) (3,411)  
Depreciation and amortization 621 633  
Interest on long-term debt and other interest expense 5,268 5,110  
(Benefit) provision for income taxes (780) (764)  
Assets $ 113,606 $ 119,824