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Share-based payments - Summary of Range of Exercise Prices of Outstanding Share Options (Detail)
Dec. 31, 2017
CAD ($)
shares
yr
Dec. 31, 2016
shares
Dec. 31, 2015
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 29,722,573 28,896,035 25,519,434
Employee stock option plan [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 29,722,573    
Option outstanding, weighted average remaining contractual life (years) | yr 2.3    
Option outstanding, Weighted average exercise price | $ $ 6.04    
Exercisable options, Shares 18,583,426    
Exercisable options, Weighted average exercise price | $ $ 7.34    
Employee stock option plan [member] | $3.00 to $3.99 [Member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 7,835,899    
Option outstanding, weighted average remaining contractual life (years) | yr 3.1    
Option outstanding, Weighted average exercise price | $ $ 3.23    
Exercisable options, Shares 2,514,519    
Exercisable options, Weighted average exercise price | $ $ 3.25    
Employee stock option plan [member] | $4.00 to $4.99 [Member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 5,842,935    
Option outstanding, weighted average remaining contractual life (years) | yr 4.1    
Option outstanding, Weighted average exercise price | $ $ 4.43    
Exercisable options, Shares 33,333    
Exercisable options, Weighted average exercise price | $ $ 4.23    
Employee stock option plan [member] | $5.00 to $5.99 [Member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 12,247    
Option outstanding, weighted average remaining contractual life (years) | yr 3.4    
Option outstanding, Weighted average exercise price | $ $ 5.91    
Exercisable options, Shares 4,082    
Exercisable options, Weighted average exercise price | $ $ 5.91    
Employee stock option plan [member] | $6.00 to $6.99 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 6,916,166    
Option outstanding, weighted average remaining contractual life (years) | yr 2.1    
Option outstanding, Weighted average exercise price | $ $ 6.66    
Exercisable options, Shares 6,916,166    
Exercisable options, Weighted average exercise price | $ $ 6.66    
Employee stock option plan [member] | $7.00 to $7.99 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 4,903,752    
Option outstanding, weighted average remaining contractual life (years) | yr 1.1    
Option outstanding, Weighted average exercise price | $ $ 7.81    
Exercisable options, Shares 4,903,752    
Exercisable options, Weighted average exercise price | $ $ 7.81    
Employee stock option plan [member] | $8.00 to $8.99 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 45,405    
Option outstanding, weighted average remaining contractual life (years) | yr 0.3    
Option outstanding, Weighted average exercise price | $ $ 8.19    
Exercisable options, Shares 45,405    
Exercisable options, Weighted average exercise price | $ $ 8.19    
Employee stock option plan [member] | $10.00 to $10.99 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Option outstanding, Shares 4,166,169    
Option outstanding, weighted average remaining contractual life (years) | yr 0.2    
Option outstanding, Weighted average exercise price | $ $ 10.42    
Exercisable options, Shares 4,166,169    
Exercisable options, Weighted average exercise price | $ $ 10.42