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Regulatory Matters: (Details) (USD $)
Jun. 30, 2013
May 31, 2013
Dec. 31, 2012
Regulatory matters:      
Regulatory asset not accruing carrying costs $ 74,300,000    
Pension and other post-retirement obligations
      
Regulatory matters:      
Regulatory asset not accruing carrying costs 50,700,000    
Flow-through taxes, net
      
Regulatory matters:      
Regulatory asset not accruing carrying costs 15,300,000    
Memorandum account to track unrealized gains and losses on purchase power contracts
      
Regulatory matters:      
Regulatory asset not accruing carrying costs 1,100,000    
GOLDEN STATE WATER COMPANY
      
Regulatory matters:      
Regulatory assets 184,893,000   176,015,000
GOLDEN STATE WATER COMPANY | Various refunds to customers
      
Regulatory matters:      
Regulatory assets (5,760,000)   (7,558,000)
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
      
Regulatory matters:      
Regulatory assets 38,003,000   42,574,000
GOLDEN STATE WATER COMPANY | Base Revenue Requirement Adjustment Mechanism
      
Regulatory matters:      
Regulatory assets 8,265,000 2,300,000 6,833,000
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case
      
Regulatory matters:      
Regulatory assets 15,577,000   16,030,000
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations
      
Regulatory matters:      
Regulatory assets 55,836,000   56,894,000
GOLDEN STATE WATER COMPANY | Flow-through taxes, net
      
Regulatory matters:      
Regulatory assets 15,340,000   16,415,000
GOLDEN STATE WATER COMPANY | General rate case memorandum accounts
      
Regulatory matters:      
Regulatory assets 17,239,000   4,495,000
GOLDEN STATE WATER COMPANY | Other regulatory assets
      
Regulatory matters:      
Regulatory assets $ 40,393,000   $ 40,332,000