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Summary of Status of Equity Incentive Plan (Detail)
 12 Months Ended
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Number of options granted | shares 13,752,016 13,752,016      
Canadian Share Options [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Options Outstanding, Beginning balance | shares 6,188,672 6,188,672 6,168,596 6,168,596  
Number of options granted | shares 377,100 377,100 615,200 615,200  
Options Outstanding, Exercised | shares     (295,768) (295,768)  
Options Outstanding, Forfeitures | shares (1,665,412) (1,665,412) (299,356) (299,356)  
Options Outstanding, Endiing balance | shares 4,900,360 4,900,360 6,188,672 6,188,672  
Weighted Average Exercise Price, Beginning balance $ 8.70   $ 8.93    
Weighted Average Exercise Price, Granted 7.30   4.46    
Weighted Average Exercise Price, Exercised     5.85    
Weighted Average Exercise Price, Forfeitures 8.98   7.57    
Weighted Average Exercise Price, Ending balance $ 8.50   $ 8.70    
Options exercisable | shares 3,734,019 3,734,019 4,369,155 4,369,155 3,870,673
Canadian Share Options [Member] | Top of Range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Range of Exercise Prices, Beginning balance $ 14.50   $ 14.50    
Range of Exercise Prices, Granted 7.30   4.46    
Range of Exercise Prices, Exercised     5.85    
Range of Exercise Prices, Forfeitures 14.50   11.16    
Range of Exercise Prices, Ending balance 14.50   14.50    
Canadian Share Options [Member] | Bottom of Range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Range of Exercise Prices, Beginning balance 4.46   5.22    
Range of Exercise Prices, Granted 7.30   4.46    
Range of Exercise Prices, Exercised     5.22    
Range of Exercise Prices, Forfeitures 7.32   5.85    
Range of Exercise Prices, Ending balance $ 4.46   $ 4.46    
U.S. Share Options [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Options Outstanding, Beginning balance | shares 5,337,070 5,337,070 4,582,237 4,582,237  
Number of options granted | shares 1,165,900 1,165,900 2,130,700 2,130,700  
Options Outstanding, Exercised | shares     (31,000) (31,000)  
Options Outstanding, Forfeitures | shares (944,349) (944,349) (1,344,867) (1,344,867)  
Options Outstanding, Endiing balance | shares 5,558,621 5,558,621 5,337,070 5,337,070  
Weighted Average Exercise Price, Beginning balance   $ 6.69   $ 8.30  
Weighted Average Exercise Price, Granted   5.56   3.30  
Weighted Average Exercise Price, Exercised       4.95  
Weighted Average Exercise Price, Forfeitures   8.42   6.86  
Weighted Average Exercise Price, Ending balance   $ 6.16   $ 6.69  
Options exercisable | shares 2,891,808 2,891,808 2,626,326 2,626,326 2,468,185
U.S. Share Options [Member] | Top of Range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Range of Exercise Prices, Beginning balance   $ 15.21   $ 15.21  
Range of Exercise Prices, Granted   5.57   5.02  
Range of Exercise Prices, Exercised       4.95  
Range of Exercise Prices, Forfeitures   10.96   10.74  
Range of Exercise Prices, Ending balance   15.21   15.21  
U.S. Share Options [Member] | Bottom of Range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Range of Exercise Prices, Beginning balance   3.21   4.95  
Range of Exercise Prices, Granted   3.99   3.21  
Range of Exercise Prices, Exercised       4.95  
Range of Exercise Prices, Forfeitures   5.79   3.21  
Range of Exercise Prices, Ending balance   $ 3.21   $ 3.21