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Segment and Non-Tariffed Business Reporting (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
subsidiaries
reportable_segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]                      
Number of Subsidiaries | subsidiaries                 4    
Number of Reportable Segments | reportable_segment                 2    
Operating revenue $ 79,306 $ 112,344 $ 86,944 $ 61,112 $ 87,613 $ 82,955 $ 72,402 $ 62,112 $ 339,706 $ 305,082 $ 319,668
Utilities Operating Expense                 246,590 225,122 226,790
Operating Income (Loss) 16,389 36,346 29,800 10,581 31,685 18,260 17,210 12,805 93,116 79,960 92,878
Net income 13,727 $ 18,959 $ 16,775 $ 3,378 16,192 $ 9,534 $ 7,461 $ 4,695 52,839 37,882 51,806
Depreciation and amortization                 44,625 40,740 37,905
Provision for income taxes                 33,542 23,272 24,971
Assets 1,443,376       1,337,325       1,443,376 1,337,325  
SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 339,706 305,082 319,668
Utilities Operating Expense                 246,590 225,122 226,790
Operating Income (Loss)                 93,116 79,960 92,878
Net income                 52,839 37,882 51,806
Depreciation and amortization                 44,625 40,740 37,905
Interest Expense                 21,838 22,186 20,788
Provision for income taxes                 33,542 23,272 24,971
Assets 1,443,376       1,337,325       1,443,376 1,337,325 1,265,356
Regulated [Member] | Water Utility Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 326,547 291,949 306,474
Utilities Operating Expense                 236,459 214,538 216,914
Operating Income (Loss)                 90,088 77,411 89,560
Net income                 45,594 38,402 50,612
Depreciation and amortization                 42,709 38,742 35,926
Interest Expense                 18,667 18,935 17,555
Provision for income taxes                 27,902 23,802 24,210
Assets 1,368,886       1,250,552       1,368,886 1,250,552 1,177,106
Regulated [Member] | SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 326,547 291,949 306,474
Utilities Operating Expense                 236,459 214,538 216,914
Operating Income (Loss)                 90,088 77,411 89,560
Net income                 45,594 38,402 50,612
Depreciation and amortization                 42,709 38,742 35,926
Interest Expense                 18,667 18,935 17,555
Provision for income taxes                 27,902 23,802 24,210
Assets 1,368,886       1,250,552       1,368,886 1,250,552 1,177,106
Nonregulated Operation [Member] | Water Utility Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 6,442 6,145 6,175
Utilities Operating Expense                 4,257 4,149 4,686
Operating Income (Loss)                 2,185 1,996 1,489
Net income                 954 882 668
Depreciation and amortization                 480 434 359
Interest Expense                 0 0 0
Provision for income taxes                 750 730 471
Assets 17,794       18,106       17,794 18,106 18,071
Nonregulated Operation [Member] | Real Estate Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 6,717 6,988 7,019
Utilities Operating Expense                 4,074 4,079 4,193
Operating Income (Loss)                 2,643 2,909 2,826
Net income                 7,406 953 1,050
Depreciation and amortization                 1,436 1,564 1,620
Interest Expense                 912 1,019 1,022
Provision for income taxes                 4,235 513 542
Assets 54,818       65,571       54,818 65,571 65,787
Nonregulated Operation [Member] | All Other [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 0 0 0 [1]
Utilities Operating Expense                 1,800 2,356 997 [1]
Operating Income (Loss)                 (1,800) (2,356) (997) [1]
Net income                 (1,115) (2,355) (524) [1]
Depreciation and amortization                 0 0 0 [1]
Interest Expense                 2,259 2,232 2,211 [1]
Provision for income taxes                 655 (1,773) (252) [1]
Assets 1,878       3,096       1,878 3,096 4,392 [1]
Nonregulated Operation [Member] | SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 13,159 13,133 13,194
Utilities Operating Expense                 10,131 10,584 9,876
Operating Income (Loss)                 3,028 2,549 3,318
Net income                 7,245 (520) 1,194
Depreciation and amortization                 1,916 1,998 1,979
Interest Expense                 3,171 3,251 3,233
Provision for income taxes                 5,640 (530) 761
Assets $ 74,490       $ 86,773       $ 74,490 $ 86,773 $ 88,250
[1] The “All Other” category includes the accounts of SJW Group on a stand-alone basis.