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Stock-based compensation - Performance and deferred stock unit plan (Details)
 12 Months Ended
Jan. 01, 2021
Dec. 31, 2023
CAD ($)
$ / shares
shares
Dec. 31, 2022
CAD ($)
$ / shares
shares
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Current portion of DSU liabilities | $   $ 0 $ 5,099,000  
Performance restricted share units (PSUs)        
Number of units        
Beginning balance (in shares)   431,714 426,569  
Granted (in shares)   101,597 116,775  
Vested/redeemed (in shares)   (213,623) (111,630)  
Ending balance (in shares)   319,688 431,714  
Weighted-average exercise price $ per share        
Outstanding, beginning of period (CAD per unit) | $ / shares   $ 12.47 $ 12.06  
Granted, Weighted average exercise price (CAD per unit) | $ / shares   25.62 15.55  
Vested/redeemed, Weighted average exercise price (CAD per unit) | $ / shares   8.48 14.13  
Outstanding, end of period (CAD per unit) | $ / shares   $ 19.32 $ 12.47  
Vested (in shares)   213,623 111,630  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Risk-free interest rate   4.21% 3.14%  
Expected volatility   38.90% 48.70%  
Performance restricted share unit plan | Performance restricted share units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance restricted share unit plan granted to the services to be provided   2 years    
Award vesting period   3 years    
Restricted share unit plan | Performance restricted share units (PSUs)        
Number of units        
Vested/redeemed (in shares)   (213,623) (111,630)  
Weighted-average exercise price $ per share        
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements | $   $ 3,655,000 $ 3,251,000  
Period for award recognition   1 year 6 months 1 year 3 months 18 days  
Vested (in shares)   213,623 111,630  
Settlement ratio, per PSU (in shares)   1.48 1.14  
Deferred stock unit plan | Deferred stock units (DSUs)        
Number of units        
Beginning balance (in shares)   1,020,213 932,644  
Granted (in shares)   31,575 87,569  
Vested/redeemed (in shares)   (286,152) 0  
Ending balance (in shares)   765,636 1,020,213  
Weighted-average exercise price $ per share        
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements | $   $ 0    
Vested (in shares)   286,152 0  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Required annual fixed remuneration in form of DSUs if shareholding guidelines are met, percentage 60.00%      
Percentage of annual bonus eligible for deferred stock units 50.00%      
Fair market value (CAD per share) | $ / shares   $ 27.90 $ 17.90  
Award units settled during the period | $   $ 7,817,000 $ 0  
Deferred stock unit plan | Deferred stock units (DSUs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Required annual fixed remuneration in form of DSUs, percentage       50.00%
Required annual fixed remuneration in form of DSUs if shareholding guidelines are not met, percentage 0.00%      
Deferred stock unit plan | Deferred stock units (DSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Required annual fixed remuneration in form of DSUs, percentage       100.00%
Required annual fixed remuneration in form of DSUs if shareholding guidelines are not met, percentage 100.00%      
Deferred stock unit plan | Deferred stock units (DSUs) | Accrued liabilities        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Current portion of DSU liabilities | $   0 5,099,000  
Deferred stock unit plan | Deferred stock units (DSUs) | Other liabilities        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Non-current portion of award obligation | $   $ 21,361,000 $ 13,159,000