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Share Capital - Schedule of Option Activity (Detail) - CAD / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance, Number of Options 8,071,056 9,465,372  
Granted, Number of Options 256,477    
Exercised, Number of Options (4,333) (625,201)  
Forfeited, Number of Options (86,999) (769,115)  
Expired, Number of Options (2,250,747)    
Ending balance, Number of Options 5,985,454 8,071,056  
Exercise Price Range, lower range CAD 2.84 CAD 1.42 CAD 1.42
Exercise Price Range, upper range 5.66 7.09 CAD 7.09
Beginning balance, Weighted Average, Price per Share 4.86 4.63  
Granted, Weighted Average, Price per Share 2.86    
Exercised, Weighted Average, Price per Share 3.28 2.53  
Forfeited, Weighted Average, Price per Share 3.84 3.97  
Expired, Weighted Average, Price per Share 4.85    
Ending balance, Weighted Average, Price per Share CAD 4.78 CAD 4.86  
Number of Exercisable Options 5,617,312 7,062,972 6,760,992
Weighted Average Price of Exercisable Options CAD 4.89 CAD 4.97 CAD 4.83
Granted [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range, lower range 2.84    
Exercise Price Range, upper range 3.32    
Exercised [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range, lower range 3.12 2.53  
Exercise Price Range, upper range 3.33 2.53  
Forfeited [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range, lower range 3.49 2.53  
Exercise Price Range, upper range 4.37 CAD 5.52  
Expired [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Range, lower range 3.40    
Exercise Price Range, upper range CAD 7.09