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Segment and Non-Tariffed Businesses Reporting (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
reportable_segment
subsidiary
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]                        
Number of subsidiaries | subsidiary                 4      
Number of reportable segments | reportable_segment                 2      
Operating revenue $ 135,700 $ 165,863 $ 147,209 $ 115,754 $ 125,838 $ 113,997 $ 102,965 $ 77,682 $ 564,526 $ 420,482 $ 397,699  
Operating expense                 446,856 363,003 324,259  
Operating income (loss) 24,290 41,883 36,070 15,427 6,016 17,084 21,971 12,408 117,670 57,479 73,440  
Net income (loss) 13,284 $ 26,093 $ 19,721 $ 2,417 (5,486) $ 9,478 $ 13,538 $ 5,873 61,515 23,403 38,767  
Depreciation and amortization                 89,279 65,592 54,601  
Senior note and other interest expense                 54,255 31,796 24,332  
Provision for income taxes                 8,380 8,454 10,065  
Assets 3,311,465       3,132,470       3,311,465 3,132,470   $ 1,956,389
Regulated | Water Utility Services                        
Segment Reporting Information [Line Items]                        
Operating revenue                 548,013 407,116 384,639  
Operating expense                 431,375 329,520 294,536  
Operating income (loss)                 116,638 77,596 90,103  
Net income (loss)                 69,245 42,691 53,181  
Depreciation and amortization                 86,758 63,775 53,067  
Senior note and other interest expense                 33,877 25,073 22,157  
Provision for income taxes                 16,563 8,382 14,826  
Assets 3,197,626       3,016,846       3,197,626 3,016,846   1,492,954
Regulated | SJW Corp.                        
Segment Reporting Information [Line Items]                        
Operating revenue                 548,013 407,116 384,639  
Operating expense                 431,375 329,520 294,536  
Operating income (loss)                 116,638 77,596 90,103  
Net income (loss)                 69,245 42,691 53,181  
Depreciation and amortization                 86,758 63,775 53,067  
Senior note and other interest expense                 33,877 25,073 22,157  
Provision for income taxes                 16,563 8,382 14,826  
Assets 3,197,626       3,016,846       3,197,626 3,016,846   1,492,954
Non- tariffed | Water Utility Services                        
Segment Reporting Information [Line Items]                        
Operating revenue                 10,981 7,969 7,578  
Operating expense                 6,943 5,443 5,012  
Operating income (loss)                 4,038 2,526 2,566  
Net income (loss)                 4,099 2,019 1,848  
Depreciation and amortization                 442 420 338  
Senior note and other interest expense                 0 0 0  
Provision for income taxes                 998 708 719  
Assets 8,869       5,507       8,869 5,507   4,489
Non- tariffed | Real Estate Services                        
Segment Reporting Information [Line Items]                        
Operating revenue                 5,532 5,397 5,482  
Operating expense                 3,510 3,751 3,539  
Operating income (loss)                 2,022 1,646 1,943  
Net income (loss)                 1,455 1,623 885  
Depreciation and amortization                 1,186 1,196 1,196  
Senior note and other interest expense                 0 0 0  
Provision for income taxes                 467 486 903  
Assets 44,405       46,778       44,405 46,778   46,517
Non- tariffed | All Other                        
Segment Reporting Information [Line Items]                        
Operating revenue                 0 0 0  
Operating expense                 5,028 24,289 21,172  
Operating income (loss)                 (5,028) (24,289) (21,172)  
Net income (loss)                 (13,284) (22,930) (17,147)  
Depreciation and amortization                 893 201 0  
Senior note and other interest expense                 20,378 6,723 2,175  
Provision for income taxes                 (9,648) (1,122) (6,383)  
Assets 60,565       63,339       60,565 63,339   412,429
Non- tariffed | SJW Corp.                        
Segment Reporting Information [Line Items]                        
Operating revenue                 16,513 13,366 13,060  
Operating expense                 15,481 33,483 29,723  
Operating income (loss)                 1,032 (20,117) (16,663)  
Net income (loss)                 (7,730) (19,288) (14,414)  
Depreciation and amortization                 2,521 1,817 1,534  
Senior note and other interest expense                 20,378 6,723 2,175  
Provision for income taxes                 (8,183) 72 $ (4,761)  
Assets $ 113,839       $ 115,624       $ 113,839 $ 115,624   $ 463,435