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Earnings Per Share of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]                
Net income $ 34,325 $ 9,447 $ (22,334) $ 55,683 $ 19,215 $ 894 $ 21,438 $ 75,792
Net loss attributable to noncontrolling interests (113)     (189)     (345) (650)
Net income attributable to California Water Service Group $ 34,438     $ 55,872     $ 21,783 $ 76,442
Weighted average common shares outstanding, basic (in shares) 57,704     54,007     56,695 54,063
Weighted average common shares outstanding, dilutive (in shares) 57,740     54,042     56,731 54,104
Earnings per share of common stock - basic (in dollars per share) $ 0.60     $ 1.03     $ 0.38 $ 1.41
Earnings per share of common stock - diluted (in dollars per share) $ 0.60     $ 1.03     $ 0.38 $ 1.41