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Summary of Significant Accounting Policies (Details)
customer in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2018
USD ($)
customer
registrant
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Summary of significant accounting policies          
Operating Lease, Right-of-Use Asset     $ 10,000,000    
Debt Issuance Costs, Net     3,571,000 $ 3,902,000  
Related Party Transaction, Amounts of Transaction     $ 4,200,000 4,000,000 $ 3,900,000
Basis of Presentation:          
Number of registrants filing combined report | registrant     2    
Related Party Transactions          
Maximum borrowing capacity     $ 150,000,000.0    
Impairment of Long-Lived Assets          
Impairment of long-lived assets     0 0 0
Goodwill          
Goodwill arose from acquisition of subcontractor's business     1,100,000 1,100,000  
Sales and Use Taxes:          
Non-income tax assessments accounted on a gross basis     $ 18,404,000 $ 17,905,000 $ 16,801,000
Issuance of Common Shares (in shares) | shares     44,906 56,498 56,900
Short-term Debt, Terms     P24M    
Debt and Capital Lease Obligations     $ 324,978,000 $ 325,265,000  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability     10,000,000    
6.70% notes due 2019          
Sales and Use Taxes:          
Debt and Capital Lease Obligations     $ 40,000,000 $ 40,000,000  
Interest rate per annum (as a percent)     6.70% 6.70%  
Contracted Services [Member]          
Summary of significant accounting policies          
Period of Fixed Price Contracts to Maintain Water Systems at Various Military Bases     50 years    
GSWC          
Summary of significant accounting policies          
Debt Issuance Costs, Net     $ 3,571,000 $ 3,902,000  
Property and Depreciation          
Aggregate composite rate for depreciation (as a percent)     2.70% 2.60% 2.90%
Depreciation     $ 37,300,000 $ 36,500,000 $ 36,100,000
Depreciation on transportation equipment     $ 238,000 242,000 259,000
Estimated useful lives of utility plant, as authorized by the CPUC          
Generation     40 years    
Interest          
Amount recorded in AFUDC     $ 156,000 0 101,000
Alternative-Revenue Programs          
Number of months within which expected additional revenue collection is recorded     24 months    
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     $ 387,889,000    
Sales and Use Taxes:          
Cost of Reimbursable Expense     3,600,000 3,600,000 3,500,000
Non-income tax assessments accounted on a gross basis     16,809,000 16,402,000 $ 15,444,000
Issuance of Common Shares     47,500,000    
Debt and Capital Lease Obligations     324,978,000 325,265,000  
Inter-company payable to Parent     57,289,000 0  
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     324,978,000 325,265,000  
GSWC | Fair Value          
Fair Value of Financial Instruments          
Long-term debt-GSWC       424,042,000  
GSWC | Fair Value | Level 2          
Fair Value of Financial Instruments          
Long-term debt-GSWC     $ 387,889,000    
GSWC | Minimum          
Estimated useful lives of utility plant, as authorized by the CPUC          
Source of water supply     30 years    
Pumping     25 years    
Water treatment     20 years    
Transmission and distribution     25 years    
Other plant     7 years    
GSWC | Maximum          
Estimated useful lives of utility plant, as authorized by the CPUC          
Source of water supply     50 years    
Pumping     40 years    
Water treatment     35 years    
Transmission and distribution     55 years    
Other plant     40 years    
GSWC | 6.70% notes due 2019          
Sales and Use Taxes:          
Debt and Capital Lease Obligations     $ 40,000,000 $ 40,000,000  
Interest rate per annum (as a percent)     6.70% 6.70%  
GSWC | Notes Payable, Other Payables [Member] | Notes Receivable          
Related Party Transactions          
Notes Receivable, Related Parties, Current       $ 0  
GSWC | Water Service Utility Operations [Member]          
Nature of Operations:          
Number of customers served | customer     260    
Interest          
Weighted cost of capital (as a percent)     8.34%    
GSWC | Electric Service Utility Operations [Member]          
Nature of Operations:          
Number of customers served | customer     24    
Sales and Use Taxes:          
Cost Of Debt Percent     6.96%    
American States Utility Services [Member] | 6.70% notes due 2019          
Sales and Use Taxes:          
Interest rate per annum (as a percent)     6.70%    
American States Utility Services [Member] | Contracted Services [Member]          
Nature of Operations:          
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases 50 years   50 years    
Sales [Member] | GSWC | Water Service Utility Operations [Member]          
Nature of Operations:          
Percentage of total revenues     90.00% 90.00% 90.00%
Sales [Member] | GSWC | Electric Service Utility Operations [Member]          
Nature of Operations:          
Percentage of total revenues   90.00%      
Syndicated revolving credit facility | Syndicated revolving credit facility          
Related Party Transactions          
Maximum borrowing capacity     $ 150,000,000    
AWR          
Related Party Transactions          
Maximum borrowing capacity     $ 150,000,000    
Common Stock [Member]          
Sales and Use Taxes:          
Issuance of Common Shares (in shares) | shares     77,000 110,000 69,000
Common Stock [Member] | GSWC          
Sales and Use Taxes:          
Issuance of Common Shares (in shares) | shares     19