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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 65,396 $ 61,116 $ 125,886 $ 116,368
Other comprehensive income:        
Amortization of defined benefit pension plans, net of tax of $149, $60, $447, and $180, respectively 384 154 1,154 462
Other comprehensive income, net of tax 384 154 1,154 462
Comprehensive income 65,780 61,270 127,040 116,830
Comprehensive loss attributable to noncontrolling interest (12) (114) (24) (361)
Comprehensive income attributable to California Water Service Group $ 65,792 $ 61,384 $ 127,064 $ 117,191