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Net Interest Expense and Other Net Finance Expense - Schedule of Interest Expense (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net interest expense income [line items]    
Interest on finance leases CAD 0.1 CAD 0.3
Other 1.6 1.1
Total interest expense 29.0 31.4
Interest income on available-for-sale investment debt securities (2.4) (2.1)
Other (0.8) (0.7)
Total interest income (3.2) (2.8)
Net interest expense 25.8 28.6
Notes payable [member]    
Disclosure of net interest expense income [line items]    
Interest Expense 2.9 4.4
Revolving credit facilities [member]    
Disclosure of net interest expense income [line items]    
Interest Expense CAD 24.4 19.8
Senior secured notes [member]    
Disclosure of net interest expense income [line items]    
Interest Expense   CAD 5.8