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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