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Long-Term Debt - Future Minimum Lease Payments and Present Value of the Net Minimum Lease Payments under Finance Leases (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of finance lease and operating lease by lessee [Line Items]    
Total minimum lease payments CAD 10.5 CAD 23.3
Present value of minimum lease payments 10.4 23.1
Within one year [member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Total minimum lease payments 7.4 12.9
2018 to 2022 [member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Total minimum lease payments CAD 3.1 CAD 10.4