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Segment and Non-Tariffed Business Reporting (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
subsidiaries
reportable_segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting Information [Line Items]                      
Number of Subsidiaries | subsidiaries                 5    
Number of Reportable Segments | reportable_segment                 2    
Operating revenue $ 87,613 $ 82,955 $ 72,402 $ 62,112 $ 69,286 $ 125,430 $ 70,356 $ 54,596 $ 305,082 $ 319,668 $ 276,869
Utilities Operating Expense                 225,122 226,790 223,462
Operating Income (Loss) 31,685 18,260 17,210 12,805 15,589 59,114 12,121 6,054 79,960 92,878 53,407
Net income 16,192 $ 9,534 $ 7,461 $ 4,695 5,688 $ 38,366 $ 6,846 $ 906 37,882 51,806 22,384
Depreciation and amortization                 40,740 37,905 35,039
Provision for income taxes                 23,272 24,971 14,135
Assets 1,340,963       1,269,304       1,340,963 1,269,304  
SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 305,082 319,668 276,869
Utilities Operating Expense                 225,122 226,790 223,462
Operating Income (Loss)                 79,960 92,878 53,407
Net income                 37,882 51,806 22,384
Depreciation and amortization                 40,740 37,905 35,039
Interest Expense                 22,186 20,788 19,922
Provision for income taxes                 23,272 24,971 14,135
Assets 1,340,963       1,269,304       1,340,963 1,269,304 1,109,986
Regulated [Member] | Water Utility Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 291,949 306,474 264,782
Utilities Operating Expense                 214,538 216,914 212,761
Operating Income (Loss)                 77,411 89,560 52,021
Net income                 38,402 50,612 23,273
Depreciation and amortization                 38,742 35,926 33,067
Interest Expense                 18,935 17,555 16,616
Provision for income taxes                 23,802 24,210 14,446
Assets 1,253,785       1,180,583       1,253,785 1,180,583 1,013,229
Regulated [Member] | SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 291,949 306,474 264,782
Utilities Operating Expense                 214,538 216,914 212,761
Operating Income (Loss)                 77,411 89,560 52,021
Net income                 38,402 50,612 23,273
Depreciation and amortization                 38,742 35,926 33,067
Interest Expense                 18,935 17,555 16,616
Provision for income taxes                 23,802 24,210 14,446
Assets 1,253,785       1,180,583       1,253,785 1,180,583 1,013,229
Nonregulated [Member] | Water Utility Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 6,145 6,175 5,882
Utilities Operating Expense                 4,149 4,686 5,683
Operating Income (Loss)                 1,996 1,489 199
Net income                 882 668 (208)
Depreciation and amortization                 434 359 360
Interest Expense                 0 0 0
Provision for income taxes                 730 471 124
Assets 18,106       18,071       18,106 18,071 16,163
Nonregulated [Member] | Real Estate Services [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 6,988 7,019 6,205
Utilities Operating Expense                 4,079 4,193 4,000
Operating Income (Loss)                 2,909 2,826 2,205
Net income                 953 1,050 920
Depreciation and amortization                 1,564 1,620 1,612
Interest Expense                 1,019 1,022 1,120
Provision for income taxes                 513 542 768
Assets 65,622       65,847       65,622 65,847 71,779
Nonregulated [Member] | All Other [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 0 0 0 [1]
Utilities Operating Expense                 2,356 997 1,018 [1]
Operating Income (Loss)                 (2,356) (997) (1,018) [1]
Net income                 (2,355) (524) (1,601) [1]
Depreciation and amortization                 0 0 0 [1]
Interest Expense                 2,232 2,211 2,186 [1]
Provision for income taxes                 (1,773) (252) (1,203) [1]
Assets 3,450       4,803       3,450 4,803 8,815 [1]
Nonregulated [Member] | SJW Corp. [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenue                 13,133 13,194 12,087
Utilities Operating Expense                 10,584 9,876 10,701
Operating Income (Loss)                 2,549 3,318 1,386
Net income                 (520) 1,194 (889)
Depreciation and amortization                 1,998 1,979 1,972
Interest Expense                 3,251 3,233 3,306
Provision for income taxes                 (530) 761 (311)
Assets $ 87,178       $ 88,721       $ 87,178 $ 88,721 $ 96,757
[1] For the year ended December 31, 2015, the “All Other” category includes the accounts of SJW Corp. on a stand-alone basis and SJW Group, Inc. As of December 31, 2015, SJW Group, Inc. had no revenue or expenses recorded and as of December 31, 2015 held no assets. For the years ended December 31, 2014 and 2013, the “All Other” category includes the accounts of SJW Corp. on a stand-alone basis.