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Statements of Financial Position (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Assets    
Current assets $ 510,881 $ 470,670
Property, plant and equipment 2,338,088 2,303,338
Accounts receivable, intercompany 421,427 413,925
Liabilities and shareholders' equity    
Current liabilities 365,642 410,029
Long-term debt 914,830 1,085,970
Accounts payable and accrued liabilities, intercompany 342,382 392,053
Parent And Guarantor Subsidiaries [Member]    
Assets    
Current assets 363,987 378,740
Property, plant and equipment 2,008,758 1,959,329
Other non-current assets 138,121 97,691
Accounts receivable, intercompany 53,939 52,649
Short-term advances to affiliates 62,519 11,753
Liabilities and shareholders' equity    
Current liabilities 283,242 365,025
Long-term debt 905,811 1,085,970
Other non-current liabilities 161,134 144,477
Accounts payable and accrued liabilities, intercompany 206,340 41,202
Long-term advances from affiliates $ 170,316 $ 183,330