| **Water And Wastewater Rates (Details) $ in Thousands**                             | 9 Months Ended |
|-------------------------------------------------------------------------------------|----------------|
||
| Illinois, Ohio, and Texas [Member]                                                  |           |
| **Water And Wastewater Rates [Line Items]**                                         |           |
| Base rate increase designed to increase total operating revenues on an annual basis | $ 3,347        |
| New Jersey, Illinois, Pennsylvania (wastewater), and North Carolina [Member]        |           |
| **Water And Wastewater Rates [Line Items]**                                         |           |
| Infrastructure rehabilitation surcharges                                            | $ 1,805        |

| X                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Base rate increase designed to increase total operating revenues on an annual basis
+ References
No definition available.
+ Details**Name:**wtr_BaseRateIncreaseDesignedToIncreaseTotalOperatingRevenuesOnAnnualBasis**Namespace Prefix:**wtr_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Infrastructure Rehabilitation Surcharges
+ References
No definition available.
+ Details**Name:**wtr_InfrastructureRehabilitationSurcharges**Namespace Prefix:**wtr_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Water And Wastewater Rates [Line Items]
+ References
No definition available.
+ Details**Name:**wtr_WaterAndWastewaterRatesLineItems**Namespace Prefix:**wtr_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementGeographicalAxis=wtr_IllinoisOhioAndTexasMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementGeographicalAxis=wtr_IllinoisAndNorthCarolinaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |