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Regulatory Matters: Alternative-Revenue Programs (Details) (GSWC, USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Regulatory matters:          
Under (over) collection $ 103,616,000   $ 103,616,000   $ 122,681,000
WRAM, net of MCBA
          
Regulatory matters:          
Commercial paper, term     90 days    
Amount billed to customers as surcharges 5,800,000 9,100,000 12,200,000 19,800,000  
Under (over) collection 13,987,000   13,987,000   16,345,000
WRAM, net of MCBA | Minimum
          
Regulatory matters:          
Regulatory asset recovery periods     18 months    
WRAM, net of MCBA | Maximum
          
Regulatory matters:          
Regulatory asset recovery periods     24 months    
WRAM
          
Regulatory matters:          
Under (over) collection 13,600,000   13,600,000    
Modified Cost Balancing Account
          
Regulatory matters:          
Under (over) collection 400,000   400,000    
Base revenue requirement adjustment mechanism
          
Regulatory matters:          
Under (over) collection $ 10,100,000   $ 10,100,000   $ 8,725,000