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Summary of Expected Credit Loss Allowance (Detail) - Trade receivables [Member] - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Allowance For Doubtful Accounts [Line Items]    
Beginning balance $ 2,596 $ 6,072
Impairment loss recognized 483 56
Amounts written-off as uncollectible (416) (3,296)
Impairment loss reversed (1,247) (30)
Effect of movement in exchange rates 54 (206)
Ending balance $ 1,470 $ 2,596