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Change in significant accounting policy - Basis of presentation (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Statement [Abstract]    
Revenue $ 1,165,787 $ 964,680
Cost of sales 789,056 678,528
Gross profit 210,048 154,833
Equity earnings in affiliates and joint ventures (15,299) (25,199)
Net income 44,085 63,141
Without change/As originally reported    
Income Statement [Abstract]    
Revenue 1,169,421 957,220
Cost of sales 792,300 671,684
Gross profit 210,439 154,217
Equity earnings in affiliates and joint ventures (14,908) (25,815)
Net income 44,085 63,141
Effect of change    
Income Statement [Abstract]    
Revenue (3,634) 7,460
Cost of sales (3,244) 6,844
Gross profit (391) 616
Equity earnings in affiliates and joint ventures (391) 616
Net income $ 0 $ 0