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Summary of Status of Equity Incentive Plan (Detail)
 12 Months Ended
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Weighted Average Exercise Price, Forfeitures $ 10.58   $ 8.98    
Canadian Share Options [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Options Outstanding, Beginning balance | shares 4,900,360 4,900,360 6,188,672 6,188,672  
Options Outstanding, Granted | shares 490,200 490,200 377,100 377,100  
Options Outstanding, Forfeited | shares (657,404) (657,404) (1,665,412) (1,665,412)  
Options Outstanding, Endiing balance | shares 4,733,156 4,733,156 4,900,360 4,900,360  
Weighted Average Exercise Price, Beginning balance $ 8.50   $ 8.70    
Weighted Average Exercise Price, Granted 4.35   7.30    
Weighted Average Exercise Price, Ending balance $ 7.78   $ 8.50    
Options exercisable | shares 3,786,473 3,786,473 3,734,019 3,734,019 4,369,155
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 $ 4.46   $ 4.46    
Range of Exercise Prices, Granted 4.35   7.30    
Range of Exercise Prices, Forfeitures 10.44   7.32    
Range of Exercise Prices, Ending balance 4.35   4.46    
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 14.50   14.50    
Range of Exercise Prices, Granted 4.35   7.30    
Range of Exercise Prices, Forfeitures 14.50   14.50    
Range of Exercise Prices, Ending balance $ 14.31   $ 14.50    
U.S. Share Options [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Options Outstanding, Beginning balance | shares 5,558,621 5,558,621 5,337,070 5,337,070  
Options Outstanding, Granted | shares 1,569,250 1,569,250 1,165,900 1,165,900  
Options Outstanding, Forfeited | shares (996,021) (996,021) (944,349) (944,349)  
Options Outstanding, Endiing balance | shares 6,065,850 6,065,850 5,558,621 5,558,621  
Weighted Average Exercise Price, Beginning balance   $ 6.16   $ 6.69  
Weighted Average Exercise Price, Granted   3.45   5.56  
Weighted Average Exercise Price, Forfeitures   8.08   8.42  
Weighted Average Exercise Price, Ending balance   5.17   $ 6.16  
Weighted Average Exercise Price, Exercised   $ 3.21      
Options exercisable | shares 3,224,078 3,224,078 2,891,808 2,891,808 2,626,326
Options Outstanding, Exercised | shares (66,000) (66,000)      
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   $ 3.21   $ 3.21  
Range of Exercise Prices, Granted   3.44   3.99  
Range of Exercise Prices, Exercised   3.21      
Range of Exercise Prices, Forfeitures   3.21   5.79  
Range of Exercise Prices, Ending balance   3.21   3.21  
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   15.21   15.21  
Range of Exercise Prices, Granted   3.62   5.57  
Range of Exercise Prices, Exercised   3.21      
Range of Exercise Prices, Forfeitures   15.21   10.96  
Range of Exercise Prices, Ending balance   $ 10.74   $ 15.21