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Long-term debt - Credit facility narrative (Details)
 12 Months Ended
Dec. 31, 2023
CAD ($)
covenant
Dec. 31, 2023
AUD ($)
Oct. 03, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Line of Credit Facility [Line Items]        
Financing costs $ 6,336,000     $ 6,336,000
Credit facility | Financial Guarantee | Mikisew North American Limited Partnership ("MNALP")        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity of credit facility 110,000,000      
Revolver | Credit facility | Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity of credit facility 478,000,000      
Finance lease borrowing limit     $ 350,000,000  
Other outstanding debt limit     $ 20,000,000  
Financing costs 5,800,000      
Amount outstanding during period 31,300,000     32,000,000
Unused borrowing availability under the revolving facility 129,300,000     88,000,000
Unused borrowing availability under finance lease obligations $ 60,100,000     $ 46,600,000
Number of financial covenants | covenant 2      
Total debt to bank EBITDA ratio 3.5 3.5    
Fixed charge ratio 1.1 1.1    
Revolver | Credit facility | Credit Facility | Canadian dollar        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity of credit facility $ 280,000,000      
Revolver | Credit facility | Credit Facility | Australian dollar        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity of credit facility   $ 220,000,000    
Revolver | Credit facility | Credit Facility | Financial Guarantee        
Line of Credit Facility [Line Items]        
Credit facilities $ 74,700,000      
Revolver | Credit facility | Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Standby fees percentage 0.40%      
Revolver | Credit facility | Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Standby fees percentage 0.70%