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Financial instruments - Fair Value of Financial Instruments (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
--- | --- | --- | --- | ---
Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities | $ 2,899 |  |  |
Cross currency swap | Net Investment Hedging |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities | 81,765 |  |  |
Level 1 |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Long-term investments carried at fair value | 1,178,581 |  |  | $ 814,530
Total financial assets | 1,178,581 |  | $ 814,530 |
Long-term debt | 1,495,153 |  | 768,400 |
Convertible debentures | 623 |  | 639 |
Total financial liabilities | 1,495,776 |  | 769,039 |
Level 2 |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Long-term investments carried at fair value | 27,072 |  |  | 0
Development loans and other receivables | 37,984 |  | 110,019 |
Derivative Asset | 16 |  | 970 |
Total financial assets | 65,072 |  | 110,989 |
Long-term debt | 2,788,915 |  | 2,588,373 |
Convertible debentures | 0 |  |  |
Derivative financial instruments, liabilities | 83,837 |  | 102,785 |
Total financial liabilities | 2,887,872 |  | 2,704,861 |
Level 2 | Energy contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset |  | $ 0 |  |
Level 2 | Foreign exchange forward | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset |  |  |  | 869
Level 2 | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset | 16 |  | 101 |
Derivative financial instruments, liabilities | 2,072 |  | 1,114 |
Level 2 | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities | 81,765 |  | 93,198 |
Level 2 | Interest rate swaps | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  |  | 8,473 |
Level 2 | Series C Preferred Stock |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Convertible debentures |  |  | 13,703 |
Preferred shares, Series C | 15,120 |  |  |
Level 3 |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Long-term investments carried at fair value | 88,494 |  |  | 0
Development loans and other receivables | 0 |  | 0 |
Derivative Asset | 85,688 |  | 61,838 |
Total financial assets | 174,182 |  | 61,838 |
Derivative financial instruments, liabilities | 827 |  | 57 |
Total financial liabilities | 827 |  | 57 |
Level 3 | Energy contracts | Designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset | 65,304 |  | 61,838 |
Derivative financial instruments, liabilities | 789 |  | 57 |
Level 3 | Energy contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset |  | 20,384 |  |
Derivative financial instruments, liabilities | 38 |  |  |
Level 3 | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset | 0 |  |  |
Carrying amount |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Long-term investments carried at fair value | 1,294,147 |  | 814,530 |
Development loans and other receivables | 37,050 |  | 103,696 |
Derivative Asset | 85,704 |  | 62,808 |
Total financial assets | 1,416,901 |  | 981,034 |
Long-term debt | 3,931,868 |  | 3,336,795 |
Convertible debentures | 342 |  | 470 |
Derivative financial instruments, liabilities | 84,664 |  | 102,842 |
Total financial liabilities | 4,030,667 |  | 3,453,525 |
Carrying amount | Energy contracts | Designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset | 65,304 |  | 61,838 |
Derivative financial instruments, liabilities | 789 |  | 57 |
Carrying amount | Energy contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset |  | 20,384 |  |
Derivative financial instruments, liabilities | 38 |  |  |
Carrying amount | Foreign exchange forward | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset |  |  |  | 869
Carrying amount | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset | 16 |  | 101 |
Derivative financial instruments, liabilities | 2,072 |  | 1,114 |
Carrying amount | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities | 81,765 |  | 93,198 |
Carrying amount | Interest rate swaps | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  |  | 8,473 |
Carrying amount | Series C Preferred Stock |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Convertible debentures |  |  | 13,418 |
Preferred shares, Series C | 13,793 |  |  |
Fair value |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Long-term investments carried at fair value | 1,294,147 |  | 814,530 |
Development loans and other receivables | 37,984 |  | 110,019 |
Derivative Asset | 85,704 |  | 62,808 |
Total financial assets | 1,417,835 |  | 987,357 |
Long-term debt | 4,284,068 |  | 3,356,773 |
Convertible debentures | 623 |  | 639 |
Derivative financial instruments, liabilities | 84,664 |  | 102,842 |
Total financial liabilities | 4,384,475 |  | 3,473,957 |
Fair value | Energy contracts | Designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset | 65,304 |  | 61,838 |
Derivative financial instruments, liabilities | 789 |  | 57 |
Fair value | Energy contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset |  | $ 20,384 |  |
Derivative financial instruments, liabilities | 38 |  |  |
Fair value | Foreign exchange forward | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset |  |  |  | $ 869
Fair value | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset | 16 |  | 101 |
Derivative financial instruments, liabilities | 2,072 |  | 1,114 |
Fair value | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities | 81,765 |  | 93,198 |
Fair value | Interest rate swaps | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  |  | 8,473 |
Fair value | Series C Preferred Stock |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Convertible debentures |  |  | 13,703 |
Preferred shares, Series C | $ 15,120 |  |  |
Intrinsic Value | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative Asset |  |  | $ 441 |

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