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Segmented information - Schedule of reconciliations (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Total gross profit for reportable segments $ 210,048 $ 154,833
General and administrative costs 55,951 56,844
Loss on disposal of property, plant and equipment 767 1,659
Equity earnings in affiliates and joint ventures (15,299) (25,199)
Interest expense 59,340 36,948
Change in fair value of contingent obligations 53,206 8,268
Gain on derivative financial instruments (3,952) (6,063)
Income before income taxes 60,035 85,963
Operating Segments    
Segment Reporting Information [Line Items]    
Total gross profit for reportable segments 210,048 154,833
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment    
Segment Reporting Information [Line Items]    
General and administrative costs 55,951 56,844
Loss on disposal of property, plant and equipment 767 1,659
Equity earnings in affiliates and joint ventures (15,299) (25,199)
Interest expense 59,340 36,948
Change in fair value of contingent obligations 53,206 4,681
Gain on derivative financial instruments $ (3,952) $ (6,063)