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Taxes Other Than Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Taxes Other Than Income [Line Items]    
Taxes other than income taxes $ 14,621us-gaap_UtilitiesOperatingExpenseTaxes $ 12,102us-gaap_UtilitiesOperatingExpenseTaxes
Property [Member]    
Taxes Other Than Income [Line Items]    
Taxes other than income taxes 6,825us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_PropertyMember		 4,824us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_PropertyMember
Capital Stock [Member]    
Taxes Other Than Income [Line Items]    
Taxes other than income taxes 540us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_CapitalStockMember		 501us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_CapitalStockMember
Gross Receipts, Excise And Franchise [Member]    
Taxes Other Than Income [Line Items]    
Taxes other than income taxes 2,442us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_GrossReceiptsExciseAndFranchiseMember		 2,779us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_GrossReceiptsExciseAndFranchiseMember
Payroll [Member]    
Taxes Other Than Income [Line Items]    
Taxes other than income taxes 3,278us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_PayrollMember		 2,654us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_PayrollMember
Regulatory assessments [Member]    
Taxes Other Than Income [Line Items]    
Taxes other than income taxes 653us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_RegulatoryAssessmentsMember		 594us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_RegulatoryAssessmentsMember
Other Taxes [Member]    
Taxes Other Than Income [Line Items]    
Taxes other than income taxes $ 883us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_OtherTaxesMember		 $ 750us-gaap_UtilitiesOperatingExpenseTaxes
/ wtr_TaxesOtherThanIncomeTaxesAxis
= wtr_OtherTaxesMember