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Goodwill (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Apr. 01, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Apr. 01, 2020 | Apr. 01, 2018
--- | --- | --- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 278,297 |  | $ 278,297 | $ 278,297 |  |
PNM |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 51,632 | $ 51,600 | 51,632 |  |  | $ 51,600
Goodwill fair value exceeded by its carrying value |  | 54.00% |  |  |  | 19.00%
TNMP |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 226,665 |  | $ 226,665 |  | $ 226,700 |
Goodwill fair value exceeded by its carrying value |  |  |  |  | 38.00% |

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