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Summary of Ageing of Trade Receivables (Detail) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | $ 264,589 | $ 178,433
Gross [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 266,059 | 181,029
Gross [Member] | Not Past Due [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 175,277 | 92,880
Gross [Member] | Past Due 0 - 30 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 64,351 | 66,723
Gross [Member] | Past Due 31 - 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 25,032 | 19,410
Gross [Member] | Past Due More than 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 1,399 | 2,016
Provision for Impairment [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 1,470 | 2,596
Provision for Impairment [Member] | Past Due 31 - 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 71 | 580
Provision for Impairment [Member] | Past Due More than 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | $ 1,399 | $ 2,016

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