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Investments in affiliates and joint ventures - Accounts Payable and Receivables from Joint Ventures and Affiliates (Details) - CAD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]    
Accounts receivable $ 97,855 $ 83,811
Contract assets 35,027 15,802
Other assets 7,144 5,808
Equity Method Investee    
Schedule of Equity Method Investments [Line Items]    
Accounts receivable 41,157 65,294
Contract assets 12,019 0
Other assets 350 2,444
Accounts payable and accrued liabilities $ 15,087 $ 13,773