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Segment and Non-Tariffed Business Reporting (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
subsidiary
reportable_segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]                      
Number of Subsidiaries | subsidiary                 4    
Number of Reportable Segments | reportable_segment                 2    
Operating revenue $ 98,718 $ 124,853 $ 99,086 $ 75,042 $ 93,529 $ 124,578 $ 102,073 $ 69,045      
Utilities Operating Expense                 $ 324,259 $ 287,374 $ 242,269
Operating Income (Loss) 17,482 $ 25,828 $ 22,799 $ 7,331 18,214 $ 38,245 $ 30,787 $ 10,833 73,440 101,851 97,437
Net income before noncontrolling interest                 38,767 61,100 52,839
Depreciation and amortization                 54,601 48,292 44,625
Provision for income taxes                 10,065 35,393 33,542
Assets 1,956,389       1,458,001       1,956,389 1,458,001  
SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 397,699 389,225 339,706
Utilities Operating Expense                 324,259 287,374 242,269
Operating Income (Loss)                 73,440 101,851 97,437
Net income before noncontrolling interest                 38,767 61,100 52,839
Depreciation and amortization                 54,601 48,292 44,625
Interest Expense                 24,332 22,929 21,838
Provision for income taxes                 10,065 35,393 33,542
Assets 1,956,389       1,458,001       1,956,389 1,458,001 1,443,376
Regulated [Member] | Water Utility Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 384,639 376,104 326,547
Utilities Operating Expense                 294,536 276,061 232,138
Operating Income (Loss)                 90,103 100,043 94,409
Net income before noncontrolling interest                 53,181 47,736 45,594
Depreciation and amortization                 53,067 46,500 42,709
Interest Expense                 22,157 20,670 18,667
Provision for income taxes                 14,826 30,127 27,902
Assets 1,492,954       1,406,221       1,492,954 1,406,221 1,368,886
Regulated [Member] | SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 384,639 376,104 326,547
Utilities Operating Expense                 294,536 276,061 232,138
Operating Income (Loss)                 90,103 100,043 94,409
Net income before noncontrolling interest                 53,181 47,736 45,594
Depreciation and amortization                 53,067 46,500 42,709
Interest Expense                 22,157 20,670 18,667
Provision for income taxes                 14,826 30,127 27,902
Assets 1,492,954       1,406,221       1,492,954 1,406,221 1,368,886
Nonregulated Operation [Member] | Water Utility Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 7,578 7,419 6,442
Utilities Operating Expense                 5,012 4,855 4,257
Operating Income (Loss)                 2,566 2,564 2,185
Net income before noncontrolling interest                 1,848 1,137 954
Depreciation and amortization                 338 572 480
Interest Expense                 0 0 0
Provision for income taxes                 719 993 750
Assets 4,489       4,471       4,489 4,471 17,794
Nonregulated Operation [Member] | Real Estate Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 5,482 5,702 6,717
Utilities Operating Expense                 3,539 3,688 4,074
Operating Income (Loss)                 1,943 2,014 2,643
Net income before noncontrolling interest                 885 8,089 7,406
Depreciation and amortization                 1,196 1,220 1,436
Interest Expense                 0 60 912
Provision for income taxes                 903 644 4,235
Assets 46,517       47,668       46,517 47,668 54,818
Nonregulated Operation [Member] | All Other [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 0 0 0 [1]
Utilities Operating Expense                 21,172 2,770 1,800 [1]
Operating Income (Loss)                 (21,172) (2,770) (1,800) [1]
Net income before noncontrolling interest                 (17,147) 4,138 (1,115) [1]
Depreciation and amortization                 0 0 0 [1]
Interest Expense                 2,175 2,199 2,259 [1]
Provision for income taxes                 (6,383) 3,629 655 [1]
Assets 412,429       (359)       412,429 (359) 1,878 [1]
Nonregulated Operation [Member] | SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 13,060 13,121 13,159
Utilities Operating Expense                 29,723 11,313 10,131
Operating Income (Loss)                 (16,663) 1,808 3,028
Net income before noncontrolling interest                 (14,414) 13,364 7,245
Depreciation and amortization                 1,534 1,792 1,916
Interest Expense                 2,175 2,259 3,171
Provision for income taxes                 (4,761) 5,266 5,640
Assets $ 463,435       $ 51,780       $ 463,435 $ 51,780 $ 74,490
[1] The “All Other” category includes the accounts of SJW Group and Hydro Sub, Inc. on a stand-alone basis. For the year ended December 31, 2018, Hydro Sub, Inc. had no recorded revenue or expenses and as of December 31, 2018, held no assets and incurred no liabilities. For the years ended, December 31, 2017 and 2016, the “All Other” category includes the accounts of SJW Group on a stand-alone basis.