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Financial instruments - Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
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