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Unaudited Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 income 24,290 41,883 36,070 15,427 6,016 17,084 21,971 12,408 117,670 57,479 73,440
SJW Group net income 13,284 26,093 19,721 2,417 (5,486) 9,478 13,538 5,873 61,515 23,403 38,767
Comprehensive income $ 12,142 $ 26,169 $ 19,731 $ 2,282 $ (5,360) $ 9,478 $ 13,538 $ 5,873 $ 60,325 $ 23,529 $ 38,767
SJW Group earnings per share                      
—Basic (in dollars per share) $ 0.47 $ 0.91 $ 0.69 $ 0.08 $ (0.20) $ 0.33 $ 0.48 $ 0.21 $ 2.16 $ 0.82 $ 1.83
—Diluted (in dollars per share) 0.46 0.91 0.69 0.08 (0.19) 0.33 0.47 0.21 $ 2.14 $ 0.82 $ 1.82
Dividend per share (in dollars per share) 0.32 0.32 0.32 0.32 0.30 0.30 0.30 0.30      
High                      
SJW Group earnings per share                      
Market price range of stock (in dollars per share) 70.34 71.06 65.93 74.73 74.47 69.23 63.40 63.76      
Low                      
SJW Group earnings per share                      
Market price range of stock (in dollars per share) $ 60.11 $ 58.56 $ 53.11 $ 49.48 $ 67.13 $ 61.23 $ 59.83 $ 54.74