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Unaudited Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating revenue $ 98,718 $ 124,853 $ 99,086 $ 75,042 $ 93,529 $ 124,578 $ 102,073 $ 69,045      
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 8,823 15,788 12,871 1,285 17,305 19,540 18,688 3,671 38,767 59,204 52,839
Comprehensive income $ 8,823 $ 15,788 $ 12,871 $ 1,285 $ 17,732 $ 19,620 $ 18,744 $ 3,787 $ 38,767 $ 59,883 $ 52,052
SJW Group earnings per share                      
—Basic (in dollars per share) $ 0.38 $ 0.77 $ 0.63 $ 0.06 $ 0.84 $ 0.95 $ 0.91 $ 0.18 $ 1.83 $ 2.89 $ 2.59
—Diluted (in dollars per share) 0.38 0.76 0.62 0.06 0.84 0.94 0.90 0.18 $ 1.82 $ 2.86 $ 2.57
Dividends per share 0.28 0.28 0.28 0.28 0.38 0.22 0.22 0.22      
--- High (in dollars per share) [Member]                      
SJW Group earnings per share                      
Market Price, Stock 65.31 67.29 68.15 63.47 68.13 57.43 53.00 55.30      
--- Low (in dollars per share) [Member]                      
SJW Group earnings per share                      
Market Price, Stock $ 52.63 $ 56.12 $ 51.68 $ 51.96 $ 57.60 $ 48.46 $ 45.74 $ 46.13