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Financial instruments - Liabilities Mature (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Long-term debt obligations | $ 3,931,905 |
Convertible debentures | 346 |
Advances in aid of construction | 60,828 |
Interest on long-term debt | 1,753,259 |
Purchase obligations | 458,288 |
Environmental obligation | 58,484 | $ 59,181
Other obligations | 153,025 |
Total obligations | 6,500,799 |
Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 81,765 |
Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 2,899 |
Due less than 1 year |  |
Derivative [Line Items] |  |
Long-term debt obligations | 602,028 |
Convertible debentures | 0 |
Advances in aid of construction | 1,165 |
Interest on long-term debt | 185,231 |
Purchase obligations | 458,288 |
Environmental obligation | 14,970 |
Other obligations | 39,115 |
Total obligations | 1,306,577 |
Due less than 1 year | Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 4,149 |
Due less than 1 year | Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 1,631 |
Due 2 to 3 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 468,740 |
Interest on long-term debt | 318,469 |
Environmental obligation | 20,850 |
Other obligations | 2,120 |
Total obligations | 880,187 |
Due 2 to 3 years | Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 69,099 |
Due 2 to 3 years | Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 909 |
Due 4 to 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 600,721 |
Interest on long-term debt | 257,443 |
Environmental obligation | 1,128 |
Other obligations | 2,696 |
Total obligations | 865,839 |
Due 4 to 5 years | Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 3,851 |
Due 4 to 5 years | Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 0 |
Due after 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 2,260,416 |
Convertible debentures | 346 |
Advances in aid of construction | 59,663 |
Interest on long-term debt | 992,116 |
Environmental obligation | 21,536 |
Other obligations | 109,094 |
Total obligations | 3,448,196 |
Due after 5 years | Cross currency swap | Net Investment Hedging |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 4,666 |
Due after 5 years | Commodity contracts for regulatory operations |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | $ 359 |

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