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Regulatory Matters: (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Regulatory matters:          
Regulatory asset not accruing carrying costs $ 59,600,000   $ 59,600,000    
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account          
Regulatory matters:          
Increase (Decrease) in Other Regulatory Assets     12,200,000    
Pensions and other post-retirement obligations (Note 8)          
Regulatory matters:          
Regulatory asset not accruing carrying costs 33,500,000   33,500,000    
Derivative unrealized loss (Note 5)          
Regulatory matters:          
Regulatory asset not accruing carrying costs $ 1,143,000   $ 1,143,000    
Cost of Capital, Proceeding for Water Regions [Member]          
Regulatory matters:          
Weighted Cost of Capital Percent 8.34%   8.34%    
Settlement Agreement Proposed Authorized Return on Equity Percentage 9.43%   9.43%    
Various refunds to customers          
Regulatory matters:          
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC     $ 955,000    
Golden State Water Company          
Regulatory matters:          
Regulatory assets $ (21,636,000)   $ (21,636,000)   $ 2,042,000
Golden State Water Company | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account          
Regulatory matters:          
Investment Term     90 days    
Regulatory Asset Amount Billed to Customers as Surcharges 7,700,000 $ 11,400,000 $ 17,500,000 $ 24,800,000  
Regulatory assets 24,264,000   24,264,000   29,556,000
Golden State Water Company | Costs deferred for future recovery on Aerojet case          
Regulatory matters:          
Regulatory assets 9,809,000   9,809,000   10,656,000
Golden State Water Company | Pensions and other post-retirement obligations (Note 8)          
Regulatory matters:          
Regulatory assets 31,066,000   31,066,000   33,019,000
Golden State Water Company | Derivative unrealized loss (Note 5)          
Regulatory matters:          
Regulatory assets         2,941,000
Golden State Water Company | Low income rate assistance balancing accounts          
Regulatory matters:          
Regulatory assets 3,660,000   3,660,000   5,972,000
Golden State Water Company | General rate case memorandum accounts          
Regulatory matters:          
Regulatory assets 6,798,000   6,798,000   10,522,000
Golden State Water Company | Other regulatory assets          
Regulatory matters:          
Regulatory assets 15,506,000   15,506,000   14,875,000
Golden State Water Company | Excess deferred income taxes (Note 7)          
Regulatory matters:          
Regulatory assets 81,912,000   81,912,000   (83,231,000)
Golden State Water Company | Flow-through taxes, net (Note 7)          
Regulatory matters:          
Regulatory assets (15,816,000)   (15,816,000)   (17,716,000)
Golden State Water Company | Tax Cuts and Jobs Act (Tax Act) memorandum accounts          
Regulatory matters:          
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact 944,000   7,400,000    
Golden State Water Company | Water Revenue Adjustment Mechanism [Member]          
Regulatory matters:          
Regulatory assets 3,400,000   3,400,000    
Golden State Water Company | Modified Cost Balancing Account [Member]          
Regulatory matters:          
Regulatory assets $ 20,900,000   $ 20,900,000    
Golden State Water Company | Cost of Capital, Proceeding for Water Regions [Member]          
Regulatory matters:          
Return on Equity Percentage 8.90%   8.90%    
Weighted Cost of Capital Percent 7.91%   7.91%    
Golden State Water Company | Tax Cuts and Jobs Act (Tax Act) memorandum accounts          
Regulatory matters:          
Regulatory assets $ (8,274,000)   $ (8,274,000)   0
Golden State Water Company | Various refunds to customers          
Regulatory matters:          
Regulatory assets (7,880,000)   (7,880,000)   $ (4,552,000)
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC     3,600,000    
Electric Service Utility Operations | Tax Cuts and Jobs Act (Tax Act) memorandum accounts          
Regulatory matters:          
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact $ 125,000   $ 848,000    
Electric Service Utility Operations | Pending General Rate Case [Member]          
Regulatory matters:          
Return on Equity Percentage 9.60%   9.60%    
Settlement Agreement Proposed Authorized Return on Equity Percentage 9.95%   9.95%    
Maximum | Golden State Water Company | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account          
Regulatory matters:          
Regulatory Asset Recovery Periods     24 months    
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues     24 years    
Minimum | Golden State Water Company | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account          
Regulatory matters:          
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues     12 months