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Summary of Expected Credit Loss Allowance (Detail) - Trade receivables [Member] - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Allowance For Doubtful Accounts [Line Items]    
Beginning balance $ 1,470 $ 2,596
Impairment loss recognized 72 483
Amounts written-off as uncollectible (537) (416)
Impairment loss reversed (24) (1,247)
Effect of movement in exchange rates (52) 54
Ending balance $ 929 $ 1,470