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Financial instruments and risk management - Maximum credit exposure (Details) - CAD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value Disclosures [Abstract] |  |  |
Trade accounts receivable | $ 39,625 | $ 51,774 |
Holdbacks | 372 | 380 |
Accrued trade receivables | 33,207 | 12,266 |
Contract receivables, included in accounts receivable | 73,204 | 64,420 |
Other receivables | 10,607 | 4,367 |
Total accounts receivable | 83,811 | 68,787 |
Contract assets | 15,802 | 9,759 | $ 7,008
Total | $ 99,613 | $ 78,546 |

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