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Financial instruments and risk management - Maximum credit exposure (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value Disclosures [Abstract] |  |  |
Trade accounts receivable | $ 23,692 | $ 38,686 |
Holdbacks | 64 | 7,152 |
Accrued trade receivables | 8,445 | 13,174 |
Contract receivables, included in accounts receivable | 32,201 | 59,012 |
Other receivables | 4,172 | 7,734 |
Total accounts receivable | 36,373 | 66,746 |
Contract assets | 7,034 | 19,193 | $ 10,673
Total | $ 43,407 | $ 85,939 |

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4531-111522 + Details
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