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Regulatory Matters (Details 2) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
GSWC
Dec. 31, 2012
GSWC
Dec. 31, 2011
GSWC
Apr. 30, 2012
GSWC
WRAM, net of MCBA
Dec. 31, 2013
GSWC
WRAM, net of MCBA
Dec. 31, 2012
GSWC
WRAM, net of MCBA
Apr. 30, 2012
GSWC
WRAM, net of MCBA
Minimum
Apr. 30, 2012
GSWC
WRAM, net of MCBA
Maximum
Dec. 31, 2013
GSWC
WRAM, net of MCBA
Maximum
Dec. 31, 2013
GSWC
WRAM
Dec. 31, 2013
GSWC
Modified Cost Balancing Account
May 23, 2013
GSWC
Base revenue requirement adjustment mechanism
Dec. 31, 2013
GSWC
Base revenue requirement adjustment mechanism
Dec. 31, 2012
GSWC
Base revenue requirement adjustment mechanism
Regulatory matters:                                  
Commercial paper, term               90 days                  
Amount billed to customers as surcharges               $ 26,500,000                  
Over collection (214,000) (11,709,000) (18,748,000) (214,000) (11,709,000) (18,748,000)   468,000                  
Under (over) collection       122,681,000 176,015,000     (16,345,000) 42,574,000       20,400,000 4,100,000   8,725,000 6,833,000
Alternative revenue program                       24 months          
Under-collection balances as a percentage of adopted annual revenues             15.00%                    
Recovery period for under-collection balances that are up to 15% of adopted annual revenues                     36 months            
Recovery period for under-collection balances greater than 15% of adopted annual revenues                   19 months   18 months          
Annual surcharges as a percentage of the last authorized revenue requirement             10.00%                    
Period of surcharge approved                               12 months  
Increase in revenue requirement recoverable through surcharges collected                             $ 2,300,000 $ 1,800,000