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Financial instruments - Liabilities Mature (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Long-term debt obligations | $ 3,321,719 |
Convertible debentures | 470 |
Advances in aid of construction | 63,703 |
Interest on long-term debt | 1,576,974 |
Purchase obligations | 325,326 |
Environmental obligation | 59,181 | $ 57,292
Other obligations | 155,758 |
Total obligations | 5,605,973 |
Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 93,198 |
Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 8,473 |
Foreign exchange forward | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 0 |
Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 1,171 |
Due less than 1 year |  |
Derivative [Line Items] |  |
Long-term debt obligations | 334,855 |
Convertible debentures | 0 |
Advances in aid of construction | 1,205 |
Interest on long-term debt | 156,768 |
Purchase obligations | 325,326 |
Environmental obligation | 4,158 |
Other obligations | 33,350 |
Total obligations | 870,000 |
Due less than 1 year | Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 5,277 |
Due less than 1 year | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 8,473 |
Due less than 1 year | Foreign exchange forward | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 0 |
Due less than 1 year | Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 588 |
Due 2 to 3 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 420,797 |
Interest on long-term debt | 269,942 |
Environmental obligation | 30,140 |
Other obligations | 0 |
Total obligations | 767,431 |
Due 2 to 3 years | Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 46,026 |
Due 2 to 3 years | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 0 |
Due 2 to 3 years | Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 526 |
Due 4 to 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 825,596 |
Interest on long-term debt | 221,528 |
Environmental obligation | 2,885 |
Other obligations | 0 |
Total obligations | 1,084,502 |
Due 4 to 5 years | Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 34,436 |
Due 4 to 5 years | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 0 |
Due 4 to 5 years | Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 57 |
Due after 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 1,740,471 |
Convertible debentures | 470 |
Advances in aid of construction | 62,498 |
Interest on long-term debt | 928,736 |
Environmental obligation | 21,998 |
Other obligations | 122,408 |
Total obligations | 2,884,040 |
Due after 5 years | Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 7,459 |
Due after 5 years | Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | $ 0 |

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