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v3.25.3

Condensed Consolidated Statements Of Cash Flow (Parenthetical) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Condensed Consolidated Statements Of Cash Flows [Abstract] |  |
Debt component of allowance for funds used during construction | $ 5,795 | $ 5,381

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt component of allowance for funds used during construction + References No definition available. + Details
Name: | wtrg_DebtComponentOfAllowanceForFundsUsedDuringConstruction
Namespace Prefix: | wtrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration