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Business acquisitions, development projects and disposition transactions - Schedule of Preliminary Allocation Of The Acquisition Prices Of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Jun. 15, 2023 | Dec. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill (note 6) | $ 1,324,062 |  | $ 1,320,579 |  | $ 1,201,244
Deerfield II |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Working capital |  | $ (10,709) |  |  |
Property, plant and equipment |  | 194,419 |  |  |
Long-term debt |  | (157,935) |  |  |
Asset retirement obligation |  | (1,030) |  |  |
Deferred tax liability |  | (1,603) |  |  |
Total net assets acquired |  | 23,142 |  |  |
Cash and cash equivalents |  | 1,662 |  |  |
Net assets acquired, net of cash and cash equivalents |  | $ 21,480 |  |  |
New York Water Company, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Working capital |  |  |  | $ 4,820 |
Property, plant and equipment |  |  |  | 499,252 |
Goodwill (note 6) |  |  |  | 116,254 |
Regulatory assets |  |  |  | 65,621 |
Other assets |  |  |  | 4,507 |
Pension and other post-employment benefits |  |  |  | (13,402) |
Regulatory liabilities |  |  |  | (59,727) |
Other liabilities |  |  |  | (8,028) |
Total net assets acquired |  |  |  | 609,297 |
Cash and cash equivalents |  |  |  | 49 |
Net assets acquired, net of cash and cash equivalents |  |  |  | $ 609,248 |

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