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Regulatory Matters (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 31, 2005
Jul. 31, 2005
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Regulatory matters:          
Regulatory Assets     $ 2,700,000    
Regulatory Asset Not Accruing Carrying Costs     43,100,000    
Various refunds to customers          
Regulatory matters:          
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC     982,000    
Water Revenue Adjustment Mechanism [Member]          
Regulatory matters:          
Regulatory adjustment     16,300,000    
Pension Costs and Other Postretirement Benefit Costs          
Regulatory matters:          
Regulatory Asset Not Accruing Carrying Costs     43,400,000    
GSWC          
Regulatory matters:          
Total     (2,450,000) $ (28,340,000)  
GSWC | Revenue Subject to Refund for TCJA [Member]          
Regulatory matters:          
Total     0 (8,293,000)  
GSWC | Various refunds to customers          
Regulatory matters:          
Total     (8,478,000) (7,517,000)  
GSWC | Revenue Subject to Refund for TCJA [Member]          
Regulatory matters:          
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact       7,100,000  
GSWC | WRAM, net of MCBA          
Regulatory matters:          
Total     22,535,000 17,763,000  
GSWC | Water Revenue Adjustment Mechanism [Member]          
Regulatory matters:          
Total     11,000,000.0    
Water     0    
GSWC | Costs deferred for future recovery on Aerojet case          
Regulatory matters:          
Total     8,292,000 9,516,000  
Regulatory Asset Recovery Periods   20 years      
GSWC | Pension Costs and Other Postretirement Benefit Costs          
Regulatory matters:          
Regulatory Assets     43,400,000    
Total     40,693,000 33,124,000  
GSWC | Gain (Loss) on Derivative Instruments [Member]          
Regulatory matters:          
Total     3,171,000 311,000  
GSWC | Flow-through taxes, net          
Regulatory matters:          
Total     (12,439,000) (15,273,000)  
GSWC | Deferred Income Tax Charge [Member]          
Regulatory matters:          
Total     (79,886,000) (81,465,000)  
GSWC | Other regulatory assets, net          
Regulatory matters:          
Total     18,842,000 18,440,000  
GSWC | General Rate Case Memorandum Accounts [Member]          
Regulatory matters:          
Total     $ 4,820,000 5,054,000  
GSWC | Other Regulatory Assets (Liabilities) [Member]          
Regulatory matters:          
Total         $ 1,100,000
Electric general rate case [Member] [Member] | Revenues retroactive due to GRC delay [Member]          
Regulatory matters:          
Regulatory adjustment       $ 2,300,000  
Minimum | GSWC | General Rate Case Memorandum Accounts [Member]          
Regulatory matters:          
Regulatory Asset Recovery Periods     12 months    
Maximum | GSWC | WRAM, net of MCBA          
Regulatory matters:          
Regulatory Asset Recovery Periods     24 months    
Maximum | GSWC | Costs deferred for future recovery on Aerojet case          
Regulatory matters:          
Regulatory Asset Recovery Periods 20 years        
Maximum | GSWC | General Rate Case Memorandum Accounts [Member]          
Regulatory matters:          
Regulatory Asset Recovery Periods     36 months    
Under Collection in Two Way Pension Balancing Account [Member] | GSWC | Pension Costs and Other Postretirement Benefit Costs          
Regulatory matters:          
Regulatory adjustment     $ (2,700,000)