| **Dispositions (Details) $ in Thousands**                                 | 1 Months Ended | 3 Months Ended |
|---------------------------------------------------------------------------|----------------|----------------|
||
| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |           |           |   |   |
| **Discontinued Operations And Other Dispositions [Line Items]**           |           |           |   |   |
| Number of business units | segment                                        |           |           |   | 2 |
| Total proceeds                                                            | $ 1,059        |           |   | $ 867 |
| Net gain (loss)                                                           | $ 1,081        |           |   | (324) |
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member]       |           |           |   |   |
| **Discontinued Operations And Other Dispositions [Line Items]**           |           |           |   |   |
| Number of customers | customer                                            |           | 500            | 265 |   |
| Total proceeds                                                            |           |           |   | 3,400 |
| Net gain (loss)                                                           |           |           |   | $ 537 |

| X                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.
+ References
No definition available.
+ Details**Name:**us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.
+ References
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230
+ Details**Name:**us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Discontinued Operations And Other Dispositions [Line Items]
+ References
No definition available.
+ Details**Name:**wtr_DiscontinuedOperationsAndOtherDispositionsLineItems**Namespace Prefix:**wtr_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disposal Group, Number Of Business Units
+ References
No definition available.
+ Details**Name:**wtr_DisposalGroupNumberOfBusinessUnits**Namespace Prefix:**wtr_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of customers.
+ References
No definition available.
+ Details**Name:**wtr_NumberOfCustomers**Namespace Prefix:**wtr_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |