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Financial instruments - Liabilities Mature (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Long-term debt obligations | $ 4,534,031 |
Interest on long-term debt | 1,884,209 |
Purchase obligations | 561,690 |
Environmental obligation | 66,133 |
Advances in aid of construction | 79,864 | $ 60,828
Other obligations | 216,261 |
Total obligations | 7,452,598 |
Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 84,542 |
Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 19,325 |
Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 6,543 |
Due less than 1 year |  |
Derivative [Line Items] |  |
Long-term debt obligations | 334,352 |
Interest on long-term debt | 195,876 |
Purchase obligations | 561,690 |
Environmental obligation | 16,955 |
Advances in aid of construction | 1,236 |
Other obligations | 79,219 |
Total obligations | 1,231,308 |
Due less than 1 year | Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 37,338 |
Due less than 1 year | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 2,725 |
Due less than 1 year | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 1,917 |
Due 2 to 3 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 821,535 |
Interest on long-term debt | 337,199 |
Purchase obligations | 0 |
Environmental obligation | 26,409 |
Advances in aid of construction | 0 |
Other obligations | 6,601 |
Total obligations | 1,225,856 |
Due 2 to 3 years | Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 29,999 |
Due 2 to 3 years | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 4,346 |
Due 2 to 3 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | (233) |
Due 4 to 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 285,600 |
Interest on long-term debt | 267,112 |
Purchase obligations | 0 |
Environmental obligation | 1,251 |
Advances in aid of construction | 0 |
Other obligations | 5,232 |
Total obligations | 584,358 |
Due 4 to 5 years | Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 19,875 |
Due 4 to 5 years | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 4,369 |
Due 4 to 5 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 919 |
Due after 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 3,092,544 |
Interest on long-term debt | 1,084,022 |
Purchase obligations | 0 |
Environmental obligation | 21,518 |
Advances in aid of construction | 78,628 |
Other obligations | 125,209 |
Total obligations | 4,411,076 |
Due after 5 years | Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | (2,670) |
Due after 5 years | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 7,885 |
Due after 5 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | $ 3,940 |

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