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Regulatory Matters (Details 4) (GSWC, USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Oct. 31, 2005
Jul. 31, 2005
Dec. 31, 2013
Costs deferred for future recovery on Aerojet case
      
Regulatory matters:      
Increase in revenue requirement recoverable through surcharges collected   $ 21.3  
Recovery periods 20 years 20 years  
Reimbursement to recover costs     17.5
Costs deferred for future recovery on Aerojet case | Maximum
      
Regulatory matters:      
Recovery periods 20 years    
Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member]
      
Regulatory matters:      
Amount billed to customers as surcharges     $ 26.5