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Earnings (Loss) Per Share of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]            
Net (loss) income $ 9,447 $ (22,334) $ 19,215 $ 894 $ (12,887) $ 20,109
Net loss attributable to noncontrolling interests (109)   (269)   (232) (461)
Net income (loss) attributable to California Water Service Group $ 9,556   $ 19,484   $ (12,655) $ 20,570
Weighted average common shares outstanding, basic (in shares) 56,692   54,007   56,182 53,870
Weighted average common shares outstanding, dilutive (in shares) 56,730   54,042   56,182 53,918
(Loss) earnings per share of common stock - basic (in dollars per share) $ 0.17   $ 0.36   $ (0.23) $ 0.38
(Loss) earnings per share of common stock - diluted (in dollars per share) $ 0.17   $ 0.36   $ (0.23) $ 0.38