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Summary of Significant Accounting Policies (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Revenue    
Markup for return or profit for cost-recovery expenses $ 0cwt_AdditionalGainForCostRecoveryExpenses  
Maturity period of commercial paper 90 days  
Minimum collection period after net receivable balances were recognized in which the Company defers net WRAM and MCBA operating revenues and associated costs 24 months  
Maximum collection period in which deferred net WRAM and MCBA revenues and associated costs will be recognized 24 months  
Unearned revenue liability $ 1,500,000cwt_UnearnedRevenueLiabilityIncludedInAccruedExpensesAndOtherLiabilities $ 1,500,000cwt_UnearnedRevenueLiabilityIncludedInAccruedExpensesAndOtherLiabilities
Minimum    
Regulatory Assets and Liabilities    
Expected collection period for undercollected net WRAM and MCBA receivables 12 months  
Maximum    
Regulatory Assets and Liabilities    
Expected collection period for undercollected net WRAM and MCBA receivables 18 months