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Range of Exercise Prices for Options Outstanding (Detail)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Canadian Share Options [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares 4,021,584 4,733,156 4,021,584 4,733,156 4,900,360 4,900,360
Total options outstanding, Weighted average exercise price | $ / shares $ 7.29 $ 7.78     $ 8.50  
Options exercisable, Number | shares 3,569,069 3,786,473 3,569,069 3,786,473 3,734,019 3,734,019
Canadian Share Options [Member] | 4.46 - 7.99 Range of Exercise Prices [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares 1,105,400   1,105,400      
Total options outstanding, Weighted average exercise price | $ / shares $ 4.41          
Total options outstanding, Weighted average remaining contractual life (years) 4 years 14 days          
Options exercisable, Number | shares 778,595   778,595      
Options exercisable, Weighted average exercise price | $ / shares $ 4.44          
Canadian Share Options [Member] | 8.00 - 9.99 Range of Exercise Prices [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares 1,533,334   1,533,334      
Total options outstanding, Weighted average exercise price | $ / shares $ 7.32          
Total options outstanding, Weighted average remaining contractual life (years) 2 years 7 months 2 days          
Options exercisable, Number | shares 1,407,624   1,407,624      
Options exercisable, Weighted average exercise price | $ / shares $ 7.32          
Canadian Share Options [Member] | 10.00 - 14.50 Range of Exercise Prices [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares 1,382,850   1,382,850      
Total options outstanding, Weighted average exercise price | $ / shares $ 9.57          
Total options outstanding, Weighted average remaining contractual life (years) 6 months 21 days          
Options exercisable, Number | shares 1,382,850   1,382,850      
Options exercisable, Weighted average exercise price | $ / shares $ 9.57          
Canadian Share Options [Member] | 4.46 - 14.50 Range of Exercise Prices [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares 4,021,584   4,021,584      
Total options outstanding, Weighted average exercise price | $ / shares $ 7.29          
Total options outstanding, Weighted average remaining contractual life (years) 2 years 3 months 14 days          
Options exercisable, Number | shares 3,569,069   3,569,069      
Options exercisable, Weighted average exercise price | $ / shares $ 7.56          
U.S. Share Options [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares 6,363,050 6,065,850 6,363,050 6,065,850 5,558,621 5,558,621
Total options outstanding, Weighted average exercise price | $ / shares     $ 4.67 $ 5.17   $ 6.16
Options exercisable, Number | shares 4,348,824 3,224,078 4,348,824 3,224,078 2,891,808 2,891,808
U.S. Share Options [Member] | Top of Range [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Range of exercise prices | $ / shares   $ 3.21        
U.S. Share Options [Member] | Bottom Of Range [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Range of exercise prices | $ / shares   $ 3.21        
U.S. Share Options [Member] | 3.21 - 4.99 Range of Exercise Prices [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares   3,646,250   3,646,250    
Total options outstanding, Weighted average exercise price | $ / shares   $ 3.21        
Total options outstanding, Weighted average remaining contractual life (years)   4 years 6 months        
Options exercisable, Number | shares   2,011,540   2,011,540    
Options exercisable, Weighted average exercise price | $ / shares   $ 3.27        
U.S. Share Options [Member] | 5.00 - 7.99 Range of Exercise Prices [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares   1,924,500   1,924,500    
Total options outstanding, Weighted average exercise price | $ / shares   $ 5.61        
Total options outstanding, Weighted average remaining contractual life (years)   3 years 4 months 13 days        
Options exercisable, Number | shares   1,544,984   1,544,984    
Options exercisable, Weighted average exercise price | $ / shares   $ 5.62        
U.S. Share Options [Member] | 8.00 - 15.21 Range of Exercise Prices [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares   792,300   792,300    
Total options outstanding, Weighted average exercise price | $ / shares   $ 9.08        
Total options outstanding, Weighted average remaining contractual life (years)   7 months 6 days        
Options exercisable, Number | shares   792,300   792,300    
Options exercisable, Weighted average exercise price | $ / shares   $ 9.08        
U.S. Share Options [Member] | 3.21 - 15.21 Range of Exercise Prices [Member]            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]            
Total options outstanding, Number | shares   6,363,050   6,363,050    
Total options outstanding, Weighted average exercise price | $ / shares   $ 4.67        
Total options outstanding, Weighted average remaining contractual life (years)   3 years 8 months 1 day        
Options exercisable, Number | shares   4,348,824   4,348,824    
Options exercisable, Weighted average exercise price | $ / shares   $ 5.17