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Shareholders' capital - Stock Option Activity (Detail) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of awards      
Beginning balance (in shares) 6,738,856 6,045,014  
Granted (in shares) 1,166,717 2,328,343  
Exercised (in shares) (1,589,211) (1,634,501)  
Forfeited (in shares) (23,720)    
Ending balance (in shares) 6,292,642 6,738,856 6,045,014
Exercisable (in shares) 3,198,175    
Weighted average exercise price      
Beginning balance (CAD per share) $ 11.18 $ 9.64  
Granted (CAD per share) 12.80 12.82  
Exercised (CAD per share) 10.66 7.81  
Forfeited (CAD per share) 12.80    
Ending balance (CAD per share) 11.61 $ 11.18 $ 9.64
Exercisable (CAD per share) $ 10.44    
Additional Disclosures      
Outstanding shares, weighted average remaining contractual term 5 years 9 months 6 years 3 months 25 days 6 years 3 months 7 days
Granted, weighted average remaining contractual term 8 years 8 years  
Exercised shares, weighted average remaining contractual term 5 years 7 days 3 years 9 months 4 days  
Exercisable , weighted average remaining contractual term 4 years 11 months 5 days    
Beginning balance, aggregate intrinsic value $ 19,380 $ 10,595  
Granted, aggregate intrinsic value 0 0  
Exercised, aggregate intrinsic value 5,059 7,696  
Ending balance, aggregate intrinsic value 13,342 $ 19,380 $ 10,595
Exercisable, aggregate intrinsic value $ 10,501