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Summary of Ageing of Trade Receivables (Detail) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | $ 211,797 | $ 264,589
Gross [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 212,726 | 266,059
Gross [Member] | Not Past Due [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 144,292 | 175,277
Gross [Member] | Past Due 0 - 30 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 47,965 | 64,351
Gross [Member] | Past Due 31 - 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 19,166 | 25,032
Gross [Member] | Past Due More than 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 1,303 | 1,399
Provision for Impairment [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 929 | 1,470
Provision for Impairment [Member] | Not Past Due [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 1 |
Provision for Impairment [Member] | Past Due 0 - 30 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 8 |
Provision for Impairment [Member] | Past Due 31 - 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 28 | 71
Provision for Impairment [Member] | Past Due More than 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | $ 892 | $ 1,399

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