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Summary of Significant Accounting Policies (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Feb. 28, 2022
USD ($)
Jan. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
customer
registrant
state
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Jul. 10, 2023
USD ($)
Jun. 15, 2023
USD ($)
Jan. 13, 2023
USD ($)
Jul. 12, 2021
USD ($)
Nature of Operations:                    
Number of customers served | customer       1,000,000            
Number of States in which Entity Operates | state       10            
Number of registrants filing combined report | registrant       2            
Related Party Transactions                    
Related Party Transaction, Amounts of Transaction       $ 5,000,000 $ 5,200,000 $ 5,300,000        
Impairment of Long-Lived Assets                    
Asset Retirement Obligation, Legally Restricted Assets, Fair Value       0            
Impairment of long-lived assets       0 0 $ 0        
Goodwill                    
Goodwill arose from acquisition of subcontractor's business       $ 1,100,000 $ 1,100,000          
Advances for Construction and Contributions in aid of Constructions                    
Period for refund of advances for construction       40 years            
Fair Value of Financial Instruments                    
Long-term debt-GSWC       $ 556,214,000            
Exercise of stock options and other issuance of Common Shares | shares       18,371 25,956 47,182        
Exercise of stock options and other issuance of Common Shares | shares       18,371 25,956 47,182        
Level 1                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC       $ 0            
Level 3                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC       0            
Carrying Amount                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC $ 450,373,000     579,047,000 $ 450,373,000          
Fair Value | Level 2                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC 424,151,000     $ 556,214,000 424,151,000          
GSWC                    
Related Party Transactions                    
Intercompany borrowings payment term       24 months            
Property and Depreciation                    
Depreciation on transportation equipment       $ 212,000            
Estimated useful lives of utility plant, as authorized by the CPUC                    
Generation       40 years            
Fair Value of Financial Instruments                    
Long-term debt-GSWC       $ 522,883,000            
Water Utility Relief Funding For Overdue Water Bills Per Budget Act Of 2021                   $ 1,000,000,000
Relief funding     $ 9,500,000 3,500,000 $ 9,500,000          
Debt Instrument, Face Amount       130,000,000            
Stock Issued During Period, Value, New Issues       $ 10,000,000            
Extended Water and Wastewater Arrearage Program Funding             $ 600,000,000      
Exercise of stock options and other issuance of Common Shares | shares       1 0 0        
Exercise of stock options and other issuance of Common Shares | shares       1 0 0        
GSWC | Unsecured Private Placement Notes                    
Fair Value of Financial Instruments                    
Debt Instrument, Face Amount                 $ 130,000,000  
GSWC | Level 1                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC       $ 0            
GSWC | Level 3                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC       0            
GSWC | Carrying Amount                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC 415,373,000     544,047,000 $ 415,373,000          
GSWC | Fair Value | Level 2                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC 391,198,000     $ 522,883,000 391,198,000          
GSWC | Minimum                    
Estimated useful lives of utility plant, as authorized by the CPUC                    
Source of water supply       20 years            
Pumping       26 years            
Water treatment       26 years            
Transmission and Distribution       15 years            
Other plant       5 years            
GSWC | Maximum                    
Estimated useful lives of utility plant, as authorized by the CPUC                    
Source of water supply       60 years            
Pumping       41 years            
Water treatment       32 years            
Transmission and Distribution       80 years            
Other plant       62 years            
BVES                    
Related Party Transactions                    
Related Party Transaction, Amounts of Transaction       $ 3,500,000 2,700,000 $ 2,800,000        
Interest                    
Public Utilities, Allowance for Funds Used During Construction, Additions       14,000 106,000 $ 216,000        
Fair Value of Financial Instruments                    
Relief funding 152,000 $ 321,000     473,000          
Debt Instrument, Face Amount               $ 35,000,000    
BVES | Carrying Amount                    
Fair Value of Financial Instruments                    
Long-term debt-GSWC $ 35,000,000     $ 35,000,000 $ 35,000,000          
Golden State Water Company and Bear Valley Electric Service, Inc.                    
Property and Depreciation                    
Aggregate composite rate for depreciation (as a percent)       2.20% 2.20% 2.20%        
Depreciation       $ 38,300,000 $ 37,300,000 $ 35,500,000        
Depreciation on transportation equipment       $ 851,000 $ 382,000 $ 379,000        
Water: | GSWC                    
Nature of Operations:                    
Number of customers served | customer       264,100            
Electric: | BVES                    
Nature of Operations:                    
Number of customers served | customer       24,800            
Contracted services: | Maximum                    
Nature of Operations:                    
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases       50 years            
Contracted services: | American States Utility Services | Minimum                    
Nature of Operations:                    
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases       15 years            
Contracted services: | American States Utility Services | Maximum                    
Nature of Operations:                    
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases       50 years            
Contracted services: | Patuxent River Utility Services LLC("PRUS")                    
Nature of Operations:                    
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases       50 years            
Fair Value of Financial Instruments                    
Initial price contract value and subject to annual economic price adjustments       $ 349,000,000            
Contracted services: | Bay State Utility Service LLC ("BSUS")                    
Fair Value of Financial Instruments                    
Initial price contract value and subject to annual economic price adjustments       45,000,000            
:ContractInitialOrderValueToPerformAnEvaluationConstructionAndTransitionServices       $ 2,300,000