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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]                
Net income $ 62,499     $ 96,360     $ 97,543 $ 81,334
Net income attributable to noncontrolling interests 70 $ (149)   0     (79) 0
Net income attributable to California Water Service Group $ 62,429 $ 38,225 $ (3,032) $ 96,360 $ 5,281 $ (20,307) 97,622 81,334
Net income attributable to California Water Service Group             $ 97,622 $ 81,334
Weighted average common shares outstanding, basic (in shares) 51,823     49,576     51,119 49,034
Weighed average common shares outstanding, dilutive (in shares) 51,823     49,576     51,119 49,034
Earnings per share of common stock - basic (in dollars per share) $ 1.20     $ 1.94     $ 1.91 $ 1.66
Earnings per share of common stock - diluted (in dollars per share) $ 1.20     $ 1.94     $ 1.91 $ 1.66