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Balance Sheet Classification of Provisions and Other (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Other Provisions [Abstract]      
Current $ 2,796 $ 3,146  
Long-term 10,577 10,086  
Other provisions $ 13,373 $ 13,232 $ 15,461