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Goodwill - Narrative (Details) $ in Thousands |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 08, 2025 waterSystem | Jul. 31, 2025 USD ($) | Mar. 31, 2025 USD ($) | Sep. 30, 2025 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Goodwill reclassified to regulatory assets |  |  | $ (3,000) | $ (2,959)
Goodwill, acquired during period |  | $ 200 |  | $ 229
Tucson Water | GW-Ocotillo |  |  |  |
Business Combination [Line Items] |  |  |  |
Number of water systems acquired | waterSystem | 7 |  |  |

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