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Financial instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Level 1 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | $ 1,149,505 | $ 1,270,138
Development loans and other receivables | 0 | 0
Total derivative instruments | 0 | 0
Total financial assets | 1,149,505 | 1,270,138
Long-term debt | 2,716,700 | 2,623,628
Convertible debentures | 285 | 276
Total derivative instruments | 0 | 0
Total financial liabilities | 2,716,985 | 2,623,904
Level 1 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 0 | 0
Level 1 | Commodity contracts |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 1 | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Total derivative instruments |  | 0
Level 1 | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Interest rate swaps | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 1 | Interest rate swaps | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Congestion revenue rights | Not designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 1 | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 1 | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Total derivative instruments | 0 | 0
Level 1 | Cross-currency interest rate contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Total derivative instruments |  | 0
Level 1 | Cross-currency interest rate contract | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Cross-currency interest rate contract | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Total derivative instruments | 0 | 0
Level 1 | Cross-currency interest rate contract | Not designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 1 | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | 0 | 0
Level 2 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 0 | 0
Development loans and other receivables | 91,547 | 50,300
Total derivative instruments | 69,804 | 73,397
Total financial assets | 161,351 | 123,697
Long-term debt | 4,811,721 | 4,075,403
Convertible debentures | 0 | 0
Total derivative instruments | 26,727 | 41,420
Total financial liabilities | 4,865,579 | 4,143,678
Level 2 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 15,188 | 15,180
Level 2 | Commodity contracts |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 283
Level 2 | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 139 |
Total derivative instruments |  | 1,614
Level 2 | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,441 |
Level 2 | Interest rate swaps | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 65,711 | 69,188
Level 2 | Interest rate swaps | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 3,490 |
Level 2 | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 2 | Congestion revenue rights | Not designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 2 | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 2 | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 2 | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Total derivative instruments | 0 | 0
Level 2 | Cross-currency interest rate contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 464 |
Total derivative instruments |  | 15,435
Level 2 | Cross-currency interest rate contract | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 9,736 |
Level 2 | Cross-currency interest rate contract | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,267
Total derivative instruments | 15,550 | 24,371
Level 2 | Cross-currency interest rate contract | Not designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 2,659
Level 2 | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | 11,943 | 11,675
Level 3 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 64,213 | 74,083
Development loans and other receivables | 0 | 0
Total derivative instruments | 7,757 | 10,503
Total financial assets | 71,970 | 84,586
Long-term debt | 0 | 0
Convertible debentures | 0 | 0
Total derivative instruments | 75,885 | 128,901
Total financial liabilities | 75,885 | 128,901
Level 3 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 0 | 0
Level 3 | Commodity contracts |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 3 | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Total derivative instruments |  | 0
Level 3 | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 3 | Interest rate swaps | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 3 | Interest rate swaps | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 3 | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 7,757 |
Level 3 | Congestion revenue rights | Not designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 10,110
Level 3 | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 64,370 |
Level 3 | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 120,284
Level 3 | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 393
Total derivative instruments | 11,515 | 8,617
Level 3 | Cross-currency interest rate contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Total derivative instruments |  | 0
Level 3 | Cross-currency interest rate contract | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 3 | Cross-currency interest rate contract | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Total derivative instruments | 0 | 0
Level 3 | Cross-currency interest rate contract | Not designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 3 | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | 0 | 0
Carrying amount |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,213,718 | 1,344,207
Development loans and other receivables | 98,313 | 53,680
Total derivative instruments | 77,561 | 83,900
Total financial assets | 1,389,592 | 1,481,787
Long-term debt | 8,083,147 | 7,512,017
Convertible debentures | 238 | 245
Total derivative instruments | 102,612 | 170,321
Total financial liabilities | 8,223,872 | 7,720,463
Carrying amount | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 25,808 | 25,808
Carrying amount | Commodity contracts |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 283
Carrying amount | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 139 |
Total derivative instruments |  | 1,614
Carrying amount | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,441 |
Carrying amount | Interest rate swaps | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 65,711 | 69,188
Carrying amount | Interest rate swaps | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 3,490 |
Carrying amount | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 7,757 | 10,110
Carrying amount | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 64,370 |
Carrying amount | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 120,284
Carrying amount | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 11,515 | 8,617
Carrying amount | Energy contracts | Not designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 393
Carrying amount | Cross-currency interest rate contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 464 |
Total derivative instruments |  | 15,435
Carrying amount | Cross-currency interest rate contract | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 9,736 |
Carrying amount | Cross-currency interest rate contract | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,267
Total derivative instruments | 15,550 | 24,371
Carrying amount | Cross-currency interest rate contract | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 2,659
Carrying amount | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | 12,067 | 12,072
Fair value |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,213,718 | 1,344,221
Development loans and other receivables | 91,547 | 50,300
Total derivative instruments | 77,561 | 83,900
Total financial assets | 1,382,826 | 1,478,421
Long-term debt | 7,528,421 | 6,699,031
Convertible debentures | 285 | 276
Total derivative instruments | 102,612 | 170,321
Total financial liabilities | 7,658,449 | 6,896,483
Fair value | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 15,188 | 15,180
Fair value | Commodity contracts |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 283
Fair value | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 139 |
Total derivative instruments |  | 1,614
Fair value | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,441 |
Fair value | Interest rate swaps | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 65,711 | 69,188
Fair value | Interest rate swaps | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 3,490 |
Fair value | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 7,757 | 10,110
Fair value | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 64,370 |
Fair value | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 120,284
Fair value | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 11,515 | 8,617
Fair value | Energy contracts | Not designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 393
Fair value | Cross-currency interest rate contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 464 |
Total derivative instruments |  | 15,435
Fair value | Cross-currency interest rate contract | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 9,736 |
Fair value | Cross-currency interest rate contract | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,267
Total derivative instruments | 15,550 | 24,371
Fair value | Cross-currency interest rate contract | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 2,659
Fair value | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | $ 11,943 | $ 11,675

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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