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Long-Term Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jun. 15, 2023
Jan. 13, 2023
Dec. 31, 2022
Apr. 28, 2022
Debt Instrument [Line Items]          
Ratio of Indebtedness to EBITDA 8        
GSWC          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 130,000        
Ratio of Indebtedness to Net Capital 0.4956        
Ratio of Indebtedness to EBITDA 3.4        
GSWC | Maximum          
Debt Instrument [Line Items]          
Ratio of Indebtedness to Net Capital 0.6667        
BVES          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 35,000      
Series A Senior Notes 5.12 Percent Due 2033 | GSWC          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     $ 100,000    
Interest rate (as a percent)     5.12%    
Private Placement Notes | GSWC          
Debt Instrument [Line Items]          
Debt Instrument Redemption Premium above Treasury Yield 50.00%        
Series A Senior Notes 5.22 Percent Due 2038 | GSWC          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     $ 30,000    
Interest rate (as a percent)     5.22%    
4.548% note due 2032          
Debt Instrument [Line Items]          
Interest rate (as a percent) 4.548%        
4.548% note due 2032 | BVES          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount         $ 17,500
Interest rate (as a percent)         4.548%
4.949% note due 2037          
Debt Instrument [Line Items]          
Interest rate (as a percent) 4.949%     4.949%  
4.949% note due 2037 | BVES          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount         $ 17,500
Interest rate (as a percent)         4.949%