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Regulatory Matters: Alternative-Revenue Programs (Details) (GSWC, USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Regulatory matters:          
Under (over) collection $ 113,305,000   $ 113,305,000   $ 122,681,000
WRAM, net of MCBA
          
Regulatory matters:          
Commercial paper, term     90 days    
Amount billed to customers as surcharges 4,500,000 7,100,000 6,400,000 10,600,000  
Under (over) collection 17,543,000   17,543,000   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 15,800,000   15,800,000    
Modified Cost Balancing Account
          
Regulatory matters:          
Under (over) collection 1,700,000   1,700,000    
Base revenue requirement adjustment mechanism
          
Regulatory matters:          
Under (over) collection $ 10,000,000   $ 10,000,000   $ 8,725,000