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Statements of Financial Position (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Assets        
Current assets $ 501,284 $ 510,881 $ 470,670  
Property, plant and equipment 2,356,173 2,338,088 2,303,338  
Accounts receivable, intercompany 378,712 421,427 413,925  
Liabilities and shareholders' equity        
Current liabilities 338,692 374,009 422,326  
Long-term debt 812,469 914,830 1,085,970  
Accounts payable and accrued liabilities, intercompany 314,355 350,749 404,350  
Cash transactions with non-guarantor subsidiaries        
Capital contributions to non-guarantor subsidiaries 2,301,729 2,365,129 $ 2,299,533 $ 2,299,533
Parent And Guarantor Subsidiaries [Member]        
Assets        
Current assets 374,188 363,987    
Property, plant and equipment 2,002,663 2,008,758    
Other non-current assets 91,240 138,121    
Accounts receivable, intercompany 60,059 53,939    
Short-term advances to affiliates 1,687 62,519    
Liabilities and shareholders' equity        
Current liabilities 262,899 283,242    
Long-term debt 812,469 905,811    
Other non-current liabilities 116,880 161,134    
Accounts payable and accrued liabilities, intercompany 29,593 206,340    
Short-term advances from affiliates 18      
Long-term advances from affiliates 215,595 $ 170,316    
Cash transactions with non-guarantor subsidiaries        
Capital contributions to non-guarantor subsidiaries $ 4,409