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Regulatory Matters (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Regulatory matters:    
Regulatory asset not accruing carrying costs $ 37,200,000  
Flow-through taxes, net
    
Regulatory matters:    
Regulatory asset not accruing carrying costs 16,200,000  
GOLDEN STATE WATER COMPANY
    
Regulatory matters:    
Total 122,681,000 176,015,000
GOLDEN STATE WATER COMPANY | Various refunds to customers
    
Regulatory matters:    
Total (4,292,000) (7,558,000)
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA
    
Regulatory matters:    
Total (16,345,000) 42,574,000
GOLDEN STATE WATER COMPANY | Base revenue requirement adjustment mechanism
    
Regulatory matters:    
Total 8,725,000 6,833,000
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case
    
Regulatory matters:    
Total 14,763,000 16,030,000
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations
    
Regulatory matters:    
Total 20,241,000 56,894,000
GOLDEN STATE WATER COMPANY | Derivative unrealized loss
    
Regulatory matters:    
Total 0 3,060,000
GOLDEN STATE WATER COMPANY | Flow-through taxes, net
    
Regulatory matters:    
Total 16,189,000 16,415,000
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts
    
Regulatory matters:    
Total 9,979,000 9,119,000
GOLDEN STATE WATER COMPANY | General rate case memorandum accounts
    
Regulatory matters:    
Total 15,645,000 4,495,000
GOLDEN STATE WATER COMPANY | Other regulatory assets, net
    
Regulatory matters:    
Total $ 25,086,000 $ 28,153,000