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Revenue from Contract with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 117,060 $ 109,077
GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Total operating revenues 75,029 82,392
Water Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 75,339 70,483
Total operating revenues 75,029 71,424
Electric Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax   10,290
Total operating revenues   10,968
Electric Service Utility Operations | Bear Valley Electric Service, Inc.    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 11,879  
Total operating revenues 11,539  
Contracted Services | ASUS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 30,492 26,685
Tariff-based Revenues | Water Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 74,288 69,254
Tariff-based Revenues | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax   10,032
Tariff-based Revenues | Electric Service Utility Operations | Bear Valley Electric Service, Inc.    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 11,677  
Surcharges (Cost-recovery Activities) | Water Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 534 734
Surcharges (Cost-recovery Activities) | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax   258
Surcharges (Cost-recovery Activities) | Electric Service Utility Operations | Bear Valley Electric Service, Inc.    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 202  
Other Products and Services | Water Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 517 495
Alternative revenues program [Member] | Water Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Alternative revenue program (310) (941)
Alternative revenues program [Member] | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Alternative revenue program   (678)
Alternative revenues program [Member] | Electric Service Utility Operations | Bear Valley Electric Service, Inc.    
Disaggregation of Revenue [Line Items]    
Alternative revenue program (340)  
Water | Contracted Services | ASUS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 18,883 14,701
Wastewater | Contracted Services | ASUS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax $ 11,609 $ 11,984