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Summary of Ageing of Trade Receivables (Detail) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | $ 113,933 | $ 211,797
Gross [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 114,795 | 212,726
Gross [Member] | Not Past Due [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 66,191 | 144,292
Gross [Member] | Past Due 0 - 30 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 35,060 | 47,965
Gross [Member] | Past Due 31 - 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 11,649 | 19,166
Gross [Member] | Past Due More than 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 1,895 | 1,303
Provision for Impairment [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 862 | 929
Provision for Impairment [Member] | Not Past Due [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 1 | 1
Provision for Impairment [Member] | Past Due 0 - 30 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 8 | 8
Provision for Impairment [Member] | Past Due 31 - 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | 26 | 28
Provision for Impairment [Member] | Past Due More than 120 Days [Member] |  |
Disclosure of provision matrix [Line Items] |  |
Total Trade Receivables | $ 827 | $ 892

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