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Regulatory Matters: Alternative-Revenue Programs (Details) (GSWC, USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Regulatory matters:      
Under (over) collection $ 119,650,000   $ 122,681,000
WRAM, net of MCBA
      
Regulatory matters:      
Commercial paper, term 90 days    
Amount billed to customers as surcharges 1,800,000 3,600,000  
Under (over) collection 18,077,000   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 18,400,000    
Modified Cost Balancing Account
      
Regulatory matters:      
Under (over) collection (303,000)    
Base revenue requirement adjustment mechanism
      
Regulatory matters:      
Under (over) collection $ 9,088,000   $ 8,725,000