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Other information - Supplemental cash flow information and net change in non-cash working capital (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash paid during the year for:    
Interest $ 33,498 $ 24,084
Income taxes 1,370 0
Cash received during the year for:    
Interest 446 177
Non-cash transactions:    
Addition of property, plant and equipment by means of finance leases 28,159 8,931
Addition of property, plant and equipment by means of finance leases assumed through acquisition 30,516 0
Increase in assets held for sale, offset by property, plant and equipment 10,927 4,276
Non-cash working capital exclusions:    
Net increase in accounts receivable related to realized gain on derivative financial instruments 4,015 0
Net decrease (increase) in accounts payable and accrued liabilities related to loans from affiliates and joint ventures 2,113 (13,500)
Net decrease in accrued liabilities related to conversion of bonus compensation to deferred stock units 0 639
Net increase in accrued liabilities related to the current portion of deferred stock unit liability 0 (5,099)
Net increase in accrued liabilities related to the current portion of contingent consideration (7,342) 0
Net increase in accrued liabilities related to taxes payable 367 (362)
Net increase in accrued liabilities related to dividend payable (576) (961)
Non-cash working capital transactions related to acquisition of MacKellar and ML Northern    
Increase in accounts receivable 65,033 4,068
Increase in contract assets 713 0
Increase in inventory 12,155 0
Increase in prepaid expenses 2,187 30
Increase in accounts payable (45,829) (48)
Increase in accrued liabilities (22,464) (599)
Non-cash working capital movement from change in foreign exchange rates    
Increase in accounts receivable 2,073 0
Increase in contract assets 23 0
Increase in inventory 387 0
Increase in prepaid expenses 70 0
Increase in accounts payable (1,727) 0
Increase in accrued liabilities (828) 0
Operating activities:    
Accounts receivable 57,077 (10,956)
Contract assets (18,489) (6,043)
Inventories (2,522) (5,354)
Contract costs 0 2,673
Prepaid expenses and deposits 6,379 (3,453)
Accounts payable 9,585 12,750
Accrued liabilities 372 (989)
Contract liabilities (1,352) (1,938)
Net changes in non-cash working capital 51,050 (13,310)
Net increase in accrued liabilities related to deferred consideration for acquisition of MacKellar    
Non-cash working capital exclusions:    
Net increase in accrued liabilities related to deferred consideration for acquisition (13,439) 0
Net increase in accrued liabilities related to deferred consideration for acquisition of ML Northern    
Non-cash working capital exclusions:    
Net increase in accrued liabilities related to deferred consideration for acquisition $ 0 $ (5,002)