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Revenues Disaggregation of Revenue (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
unit
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]          
Electric     $ 38,345 $ 37,024 $ 39,548
Operating revenues     498,853 488,243 473,869
GSWC          
Disaggregation of Revenue [Line Items]          
Electric     0 18,647 39,548
Operating revenues     347,112 349,284 359,378
GSWC | Water:          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     351,069 335,506 311,572
Operating revenues     347,112 330,637 319,830
GSWC | Water: | Tariff-based revenues          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     345,562 329,670 305,244
GSWC | Water: | CPUC-approved surcharges (cost-recovery activities)          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     3,280 3,736 4,322
GSWC | Water: | Other          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     2,227 2,100 2,006
GSWC | Water: | Alternative revenue program          
Disaggregation of Revenue [Line Items]          
Regulated Operating Revenue     $ (3,957) (4,869) 8,258
GSWC | Electric:          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers         37,038
Electric         (2,510)
Operating revenues   $ 18,647   37,024 39,548
GSWC | Electric: | Tariff-based revenues          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers         36,628
GSWC | Electric: | CPUC-approved surcharges (cost-recovery activities)          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers         410
American States Utility Services | Contracted services:          
Disaggregation of Revenue [Line Items]          
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases     50 years    
Revenue from contract with customers     $ 113,396 120,582 114,491
Operating revenues     $ 113,396 120,582 114,491
Number of construction performance obligation | unit     1    
American States Utility Services | Contracted services: | Water          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     $ 71,210 74,898 59,868
American States Utility Services | Contracted services: | Wastewater          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     42,186 45,684 $ 54,623
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric:          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers       35,969  
Electric       1,055  
Operating revenues       37,024  
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric: | Tariff-based revenues          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers       35,283  
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric: | CPUC-approved surcharges (cost-recovery activities)          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers       $ 686  
Bear Valley Electric Service, Inc. | Electric:          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     37,434    
Electric     911    
Operating revenues $ 18,377   38,345    
Bear Valley Electric Service, Inc. | Electric: | Tariff-based revenues          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     37,124    
Bear Valley Electric Service, Inc. | Electric: | CPUC-approved surcharges (cost-recovery activities)          
Disaggregation of Revenue [Line Items]          
Revenue from contract with customers     $ 310