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Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 14, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Nov. 15, 2023 | Oct. 31, 2022 | Jul. 14, 2022 | Jun. 28, 2022 | Apr. 06, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Fair value of long-term debt |  | $ 1,394,412 | $ 1,294,354 |  |  |  |  |  |
Seller financing in asset acquisition, net of discount |  | 15,400 | $ 0 | $ 0 |  |  |  |  |
Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Fair value of long-term debt |  | 1,378,683 |  |  |  |  |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Fair value of long-term debt |  | $ 15,729 |  |  |  |  |  |  |
KT Water Resource L. P. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Asset acquisition, post-closing production payment | $ 29,000 |  |  |  |  |  |  |  |
Asset acquisition, period of post-closing production payment | 29 years |  |  |  |  |  |  |  |
Seller financing in asset acquisition, net of discount | $ 15,400 |  |  |  |  |  |  |  |
SJWC | Senior notes | 4.85% Senior Note, Series P |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 70,000 |  |
Rate |  |  |  |  |  |  | 4.85% |  |
Connecticut Water | Senior notes | 4.71% Senior Note, Series 2022, Due 2052 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 25,000 |
Rate |  |  |  |  |  |  |  | 4.71% |
Connecticut Water | Senior notes | 6.46% Senior Note, Series 2023 Due 2054 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 25,000 |  |  |  |
Rate |  |  |  |  | 6.46% |  |  |  |
SJWTX | Senior notes | 5.54% Senior Notes, Due May 2052 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 15,000 |  |  |
Rate |  |  |  |  |  | 5.54% |  |  |
Maine Water | Bank term loans | 4.54% Note Due May 2042 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 15,000
Rate |  |  |  |  |  |  |  |  | 4.54%

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