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Shareholders' capital - Stock Option Activity (Detail) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of awards      
Beginning balance (in shares) 3,523,912 6,292,642  
Granted (in shares) 999,962 1,113,775  
Exercised (in shares) (2,386,275) (3,882,505)  
Forfeited (in shares) (27,151)    
Ending balance (in shares) 2,110,448 3,523,912 6,292,642
Exercisable (in shares) 1,710,662    
Weighted average exercise price      
Beginning balance (CAD per share) $ 13.09 $ 11.61  
Granted (CAD per share) 16.78 14.96  
Exercised (CAD per share) 12.52 11.23  
Forfeited (CAD per share) 14.96    
Ending balance (CAD per share) 15.45 $ 13.09 $ 11.61
Exercisable (CAD per share) $ 15.22    
Additional Disclosures      
Outstanding shares, weighted average remaining contractual term 6 years 6 months 18 days 5 years 10 months 13 days 5 years 9 months
Granted, weighted average remaining contractual term 7 years 3 months 7 days 8 years  
Exercised shares, weighted average remaining contractual term 5 years 1 month 28 days 4 years 5 months 12 days  
Exercisable , weighted average remaining contractual term 6 years 5 months 8 days    
Beginning balance, aggregate intrinsic value $ 18,609 $ 13,342  
Granted, aggregate intrinsic value 0 0  
Exercised, aggregate intrinsic value 18,465 6,225  
Ending balance, aggregate intrinsic value 11,604 $ 18,609 $ 13,342
Exercisable, aggregate intrinsic value $ 9,798