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Shareholders' capital - Stock Option Activity (Detail) - CAD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Number of awards      
Beginning balance (in shares) 2,040,528 2,110,448  
Granted (in shares) 646,090 437,006  
Exercised (in shares) (40,074) (506,926)  
Forfeited (in shares) (19,764) 0  
Ending balance (in shares) 2,626,780 2,040,528 2,110,448
Exercisable (in shares) 2,052,946    
Weighted average exercise price      
Beginning balance (in USD per share) $ 15.45    
Granted (in USD per share) 19.11 $ 19.64  
Exercised (in USD per share) 13.92 13.92  
Forfeited (in USD per share) 19.11 0  
Ending balance (in USD per share) 16.02 $ 15.45  
Exercisable (in USD per share) $ 17.35    
Weighted average remaining contractual term (years)      
Outstanding shares, weighted average remaining contractual term 5 years 7 months 17 days 6 years 1 month 9 days 6 years 6 months 18 days
Granted, weighted average remaining contractual term 7 years 2 months 19 days 7 years 2 months 19 days  
Exercised shares, weighted average remaining contractual term 5 years 11 months 12 days 5 years 11 months 12 days  
Beginning balance, aggregate intrinsic value $ 3,145 $ 11,604  
Exercised, aggregate intrinsic value 103 1,453  
Ending balance, aggregate intrinsic value $ 0 $ 3,145 $ 11,604
Exercisable , weighted average remaining contractual term 5 years 7 months 17 days