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Financial instruments - Liabilities Mature (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Long-term debt obligations | $ 8,537,557 |
Interest on long-term debt | 4,910,236 |
Purchase obligations | 767,287 |
Environmental obligation | 46,187 |
Advances in aid of construction | 88,135 | $ 88,546
Contract adjustment payments | 39,590 | $ 113,876
Other obligations | 280,481 |
Total obligations | 14,773,918 |
Cross-currency swap |  |
Derivative [Line Items] |  |
Total derivative instruments | 16,429 |
Interest rate forwards |  |
Derivative [Line Items] |  |
Total derivative instruments | 11,790 |
Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Total derivative instruments | 76,226 |
Due less than 1 year |  |
Derivative [Line Items] |  |
Long-term debt obligations | 621,856 |
Interest on long-term debt | 391,493 |
Purchase obligations | 767,287 |
Environmental obligation | 3,136 |
Advances in aid of construction | 3,640 |
Contract adjustment payments | 39,590 |
Other obligations | 27,796 |
Total obligations | 1,883,283 |
Due less than 1 year | Cross-currency swap |  |
Derivative [Line Items] |  |
Total derivative instruments | 2,419 |
Due less than 1 year | Interest rate forwards |  |
Derivative [Line Items] |  |
Total derivative instruments | 11,790 |
Due less than 1 year | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Total derivative instruments | 14,276 |
Due 2 to 3 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 1,333,772 |
Interest on long-term debt | 602,761 |
Purchase obligations | 0 |
Environmental obligation | 22,577 |
Advances in aid of construction | 0 |
Contract adjustment payments | 0 |
Other obligations | 2,901 |
Total obligations | 1,995,527 |
Due 2 to 3 years | Cross-currency swap |  |
Derivative [Line Items] |  |
Total derivative instruments | 4,243 |
Due 2 to 3 years | Interest rate forwards |  |
Derivative [Line Items] |  |
Total derivative instruments | 0 |
Due 2 to 3 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Total derivative instruments | 29,273 |
Due 4 to 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 2,099,968 |
Interest on long-term debt | 419,950 |
Purchase obligations | 0 |
Environmental obligation | 1,820 |
Advances in aid of construction | 0 |
Contract adjustment payments | 0 |
Other obligations | 2,304 |
Total obligations | 2,544,736 |
Due 4 to 5 years | Cross-currency swap |  |
Derivative [Line Items] |  |
Total derivative instruments | 144 |
Due 4 to 5 years | Interest rate forwards |  |
Derivative [Line Items] |  |
Total derivative instruments | 0 |
Due 4 to 5 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Total derivative instruments | 20,550 |
Due after 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 4,481,961 |
Interest on long-term debt | 3,496,032 |
Purchase obligations | 0 |
Environmental obligation | 18,654 |
Advances in aid of construction | 84,495 |
Contract adjustment payments | 0 |
Other obligations | 247,480 |
Total obligations | 8,350,372 |
Due after 5 years | Cross-currency swap |  |
Derivative [Line Items] |  |
Total derivative instruments | 9,623 |
Due after 5 years | Interest rate forwards |  |
Derivative [Line Items] |  |
Total derivative instruments | 0 |
Due after 5 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Total derivative instruments | $ 12,127 |

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