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Summary of Net Deferred Tax Liability (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Deferred Tax Liabilities:        
Property, plant and equipment and intangibles $ 212,545 $ 211,183    
Other 83 17    
Deferred income tax liabilities 212,628 211,200    
Offsetting of assets (165,177) (137,685)    
Deferred tax liabilities 47,451 73,515 $ 28,946  
Deferred Tax Assets:        
Losses (expire from time to time) 141,275 206,348    
Long-term incentive plan 12,810 15,320    
Other 4,386 6,767    
Deferred income tax assets 158,471 228,435    
Offsetting of liabilities (151,912) (154,773)    
Deferred tax assets 6,559 73,662 $ 455  
Net Deferred Tax Liability $ 40,892 $ (147)   $ 28,491