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GOODWILL - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2022 | Oct. 01, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |  |  |
Impairment loss |  | $ 0 |  |
CMA |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill acquired |  |  | $ 51,900,000 |
CMA Measurement Period Adjustments |  |  |  | $ 9,600,000
The Torrington Water Company (TWC) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill acquired |  |  | 44,800,000 |
New England Service Company (NESC) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill acquired |  |  |  | 21,700,000
CMA Measurement Period Adjustments |  |  | 500,000 |
Water Distribution | CMA |  |  |  |
Goodwill [Line Items] |  |  |  |
CMA Measurement Period Adjustments |  |  | 9,600,000 | 0
Water Distribution | The Torrington Water Company (TWC) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill acquired | $ 44,800,000 |  | 44,800,000 |
Water Distribution | New England Service Company (NESC) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill acquired |  |  | 22,200,000 | $ 21,700,000
CMA Measurement Period Adjustments |  |  | $ 500,000 |

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