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Balance Sheet Classification of Provisions and Other (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Other Provisions [Abstract]      
Current $ 3,146 $ 3,040  
Long-term 10,086 12,421  
Other provisions $ 13,232 $ 15,461 $ 18,829