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Financial instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Interest rate forwards |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | $ 11,790 |
Cross-currency interest rate swap |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 16,429 |
Level 1 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,054,665 | $ 1,270,138
Development loans and other receivables | 0 | 0
Total derivative instruments | 0 | 0
Total financial assets | 1,054,665 | 1,270,138
Long-term debt | 2,532,608 | 2,623,628
Convertible debentures | 276 | 276
Total derivative instruments | 0 | 0
Total financial liabilities | 2,532,884 | 2,623,904
Level 1 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 0 | 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 | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Total derivative instruments | 0 |
Level 1 | Interest rate forwards | 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 | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 1 | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Cross-currency interest rate swap | 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 swap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 1 | Commodity contracts |  |
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 | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C |  | 0
Level 2 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 0 | 0
Development loans and other receivables | 155,735 | 50,300
Total derivative instruments | 74,790 | 73,397
Total financial assets | 230,525 | 123,697
Long-term debt | 4,890,710 | 4,075,403
Convertible debentures | 0 | 0
Total derivative instruments | 37,213 | 41,420
Total financial liabilities | 4,943,243 | 4,143,678
Level 2 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 15,320 | 15,180
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 | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 72,936 | 69,188
Total derivative instruments | 11,790 |
Level 2 | Interest rate forwards | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,854 |
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 | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 6,779 | 15,435
Level 2 | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 5,547 |
Level 2 | Cross-currency interest rate swap | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,267
Total derivative instruments | 10,533 | 24,371
Level 2 | Cross-currency interest rate swap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 2,659
Level 2 | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 283
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 | 2,564 |
Level 2 | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C |  | 11,675
Level 3 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 61,064 | 74,083
Development loans and other receivables | 0 | 0
Total derivative instruments | 8,458 | 10,503
Total financial assets | 69,522 | 84,586
Long-term debt | 0 | 0
Convertible debentures | 0 | 0
Total derivative instruments | 73,663 | 128,901
Total financial liabilities | 73,663 | 128,901
Level 3 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 0 | 0
Level 3 | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 68,070 |
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 | 5,593 | 8,617
Level 3 | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Total derivative instruments | 0 |
Level 3 | Interest rate forwards | 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 | 8,458 |
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 | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 3 | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 3 | Cross-currency interest rate swap | 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 swap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 3 | Commodity contracts |  |
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 | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C |  | 0
Carrying amount |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,115,729 | 1,344,207
Development loans and other receivables | 158,110 | 53,680
Total derivative instruments | 83,248 | 83,900
Total financial assets | 1,357,087 | 1,481,787
Long-term debt | 8,516,030 | 7,512,017
Convertible debentures | 230 | 245
Total derivative instruments | 110,876 | 170,321
Total financial liabilities | 8,652,944 | 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 | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 68,070 |
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 | 5,593 | 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 | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 72,936 | 69,188
Total derivative instruments | 11,790 |
Carrying amount | Interest rate forwards | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,854 |
Carrying amount | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 8,458 | 10,110
Carrying amount | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 6,779 | 15,435
Carrying amount | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 5,547 |
Carrying amount | Cross-currency interest rate swap | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,267
Total derivative instruments | 10,533 | 24,371
Carrying amount | Cross-currency interest rate swap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 2,659
Carrying amount | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 283
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 | 2,564 |
Carrying amount | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C |  | 12,072
Fair value |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,115,729 | 1,344,221
Development loans and other receivables | 155,735 | 50,300
Total derivative instruments | 83,248 | 83,900
Total financial assets | 1,354,712 | 1,478,421
Long-term debt | 7,423,318 | 6,699,031
Convertible debentures | 276 | 276
Total derivative instruments | 110,876 | 170,321
Total financial liabilities | 7,549,790 | 6,896,483
Fair value | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | 15,320 | 15,180
Fair value | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 68,070 |
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 | 5,593 | 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 | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 72,936 | 69,188
Total derivative instruments | 11,790 |
Fair value | Interest rate forwards | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,854 |
Fair value | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 8,458 | 10,110
Fair value | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 6,779 | 15,435
Fair value | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 5,547 |
Fair value | Cross-currency interest rate swap | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,267
Total derivative instruments | 10,533 | 24,371
Fair value | Cross-currency interest rate swap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 2,659
Fair value | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 283
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 | $ 2,564 |
Fair value | Preferred shares, Series C |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C |  | $ 11,675

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