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Revenues Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Operating revenues $ 595,699 $ 491,528 $ 498,853
Cost of services 57,912 53,171 56,909
GSWC      
Disaggregation of Revenue [Line Items]      
Operating revenues 433,473 340,602 347,112
GSWC | Water:      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 400,331 329,650 351,069
Operating revenues 433,473 340,602 347,112
GSWC | Water: | Tariff-based revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 394,623 324,838 345,562
GSWC | Water: | CPUC-approved surcharges (cost-recovery activities)      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 2,955 2,461 3,280
GSWC | Water: | Other      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 2,753 2,351 2,227
GSWC | Water: | Alternative revenue program      
Disaggregation of Revenue [Line Items]      
Alternative Revenue Programs, Net 33,142 10,952 (3,957)
American States Utility Services | Contracted services:      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 120,394 110,940 113,396
Operating revenues 120,394 110,940 113,396
American States Utility Services | Contracted services: | Water      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 75,785 68,626 71,210
American States Utility Services | Contracted services: | Wastewater      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 44,609 42,314 42,186
Golden State Water Company and Bear Valley Electric Service, Inc. | Franchisor      
Disaggregation of Revenue [Line Items]      
Cost of services 4,900 4,000 4,200
BVES | Electric:      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 40,697 39,894 37,434
Operating revenues 41,832 39,986 38,345
BVES | Electric: | Tariff-based revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 40,130 39,750 37,124
BVES | Electric: | CPUC-approved surcharges (cost-recovery activities)      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customers 567 144 310
BVES | Electric: | Alternative revenue program      
Disaggregation of Revenue [Line Items]      
Alternative Revenue Programs, Net $ 1,135 $ 92 $ 911