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Shareholders' capital - Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CAD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
CAD ($)
$ / shares
shares
Dec. 31, 2017
CAD ($)
$ / shares
shares
Number of awards        
Beginning balance (in shares) | shares 6,292,642 6,738,856 6,738,856  
Granted (in shares) | shares 1,113,775 1,166,717 1,166,717  
Exercised (in shares) | shares (3,882,505) (1,589,211) (1,589,211)  
Forfeited (in shares) | shares 0 (23,720) (23,720)  
Ending balance (in shares) | shares 3,523,912 6,292,642 6,292,642 6,738,856
Exercisable (in shares) | shares 1,735,241      
Weighted average exercise price        
Beginning balance (CAD per share) | $ / shares $ 11.61   $ 11.18  
Granted (CAD per share) | $ / shares 14.96   12.80  
Exercised (CAD per share) | $ / shares 11.23   10.66  
Forfeited (CAD per share) | $ / shares 0   12.80  
Ending balance (CAD per share) | $ / shares 13.09   $ 11.61 $ 11.18
Exercisable (CAD per share) | $ / shares $ 12.57      
Additional Disclosures        
Outstanding shares, weighted average remaining contractual term 5 years 10 months 13 days 5 years 9 months 5 years 9 months 6 years 3 months 25 days
Granted, weighted average remaining contractual term 8 years 8 years 8 years  
Exercised shares, weighted average remaining contractual term 4 years 5 months 12 days 5 years 7 days 5 years 7 days  
Exercisable , weighted average remaining contractual term 5 years 5 months 4 days      
Beginning balance, aggregate intrinsic value | $ $ 13,342   $ 19,380  
Granted, aggregate intrinsic value | $ 0   0  
Exercised, aggregate intrinsic value 6,225 $ 5,059    
Ending balance, aggregate intrinsic value | $ 18,609   $ 13,342 $ 19,380
Exercisable, aggregate intrinsic value | $ $ 14,559