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Water And Wastewater Rates (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Illinois, Ohio, and Texas [Member]  
Water And Wastewater Rates [Line Items]  
Base rate increase designed to increase total operating revenues on an annual basis $ 3,347wtr_BaseRateIncreaseDesignedToIncreaseTotalOperatingRevenuesOnAnnualBasis
/ us-gaap_StatementGeographicalAxis
= wtr_IllinoisOhioAndTexasMember
Illinois and North Carolina [Member]  
Water And Wastewater Rates [Line Items]  
Infrastructure rehabilitation surcharges $ 345wtr_InfrastructureRehabilitationSurcharges
/ us-gaap_StatementGeographicalAxis
= wtr_IllinoisAndNorthCarolinaMember