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Regulatory Matters: (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Regulatory matters:    
Regulatory asset not accruing carrying costs $ 35,500,000  
Pension and other post-retirement obligations
    
Regulatory matters:    
Regulatory asset not accruing carrying costs 14,900,000  
Flow-through taxes, net
    
Regulatory matters:    
Regulatory asset not accruing carrying costs 16,200,000  
GOLDEN STATE WATER COMPANY
    
Regulatory matters:    
Regulatory assets 103,616,000 122,681,000
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
    
Regulatory matters:    
Regulatory assets 13,987,000 16,345,000
GOLDEN STATE WATER COMPANY | Base Revenue Requirement Adjustment Mechanism
    
Regulatory matters:    
Regulatory assets 10,100,000 8,725,000
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case
    
Regulatory matters:    
Regulatory assets 13,906,000 14,763,000
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations
    
Regulatory matters:    
Regulatory assets 18,142,000 20,241,000
GOLDEN STATE WATER COMPANY | Flow-through taxes, net
    
Regulatory matters:    
Regulatory assets 16,203,000 16,189,000
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts
    
Regulatory matters:    
Regulatory assets 9,218,000 9,979,000
GOLDEN STATE WATER COMPANY | General rate case memorandum accounts
    
Regulatory matters:    
Regulatory assets 6,171,000 15,645,000
GOLDEN STATE WATER COMPANY | Other regulatory assets
    
Regulatory matters:    
Regulatory assets 18,216,000 25,086,000
Various refunds to customers | GOLDEN STATE WATER COMPANY
    
Regulatory matters:    
Regulatory assets $ (2,348,000) $ (4,292,000)