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Long-Term Debt (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
GSWC
Dec. 31, 2012
GSWC
Dec. 31, 2013
Private placement notes
Dec. 31, 2012
Private placement notes
Dec. 31, 2013
Private placement notes
GSWC
Dec. 31, 2012
Private placement notes
GSWC
Dec. 31, 2013
Private placement notes
GSWC
Maximum
Dec. 31, 2012
7.55% notes due 2025
Oct. 02, 2012
7.55% notes due 2025
GSWC
Dec. 31, 2012
7.55% notes due 2025
GSWC
Dec. 31, 2012
7.55% notes due 2025
GSWC
Minimum
Dec. 31, 2013
Debt issues other than 9.56% Notes and Senior Notes issued to Co-Bank
GSWC
Maximum
Dec. 31, 2013
Senior Notes issued to Co-Bank
GSWC
Dec. 31, 2013
American Recovery and Reinvestment Act Obligation due 2033
Dec. 31, 2012
American Recovery and Reinvestment Act Obligation due 2033
Dec. 31, 2013
American Recovery and Reinvestment Act Obligation due 2033
GSWC
Dec. 31, 2012
American Recovery and Reinvestment Act Obligation due 2033
GSWC
Long-term debt                                      
Face amount of debt             $ 28,000,000                        
Interest coverage ratio                       400.00% 200.00%            
Redemption price of debt instrument, as a percentage of principal amount                     101.13%                
Principal amount of notes redeemed                     8,300,000                
Interest rate (as a percent)         9.56% 9.56% 9.56% 9.56%   7.55% 7.55% 7.55%           2.50%  
Amount of debt 332,377,000 335,791,000 332,377,000 335,791,000 28,000,000 28,000,000 28,000,000 28,000,000     8,000,000         4,269,000 4,259,000 4,269,000 4,259,000
Redemption premium (as a percent)                           0.383%          
Redemption premium after 2021 (as a percent)                 3.00%                    
Additional spread on premium (as a percent)                             0.50%        
Amount available for issuance of debt securities     $ 100,000,000.0