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Financial instruments and risk management - Contingent consideration, risk management, liquidity risk, market risk and credit risk (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2024 $ / shares
Concentration Risk [Line Items] |  |  |
Allowance for doubtful accounts | $ 0 | $ 0 |
Minimum |  |  |
Concentration Risk [Line Items] |  |  |
Payment terms | 15 days |  |
Minimum | MacKellar |  |  |
Concentration Risk [Line Items] |  |  |
Increase (decrease) in forecasted net income at fair value of earn out liability | $ 9,423,000 |  |
Maximum |  |  |
Concentration Risk [Line Items] |  |  |
Payment terms | 60 days |  |
Maximum | MacKellar |  |  |
Concentration Risk [Line Items] |  |  |
Increase (decrease) in forecasted net income at fair value of earn out liability | $ 9,423,000 |  |
Credit Facility |  |  |
Concentration Risk [Line Items] |  |  |
Outstanding balance, long-term debt | $ 395,800,000 | 317,500,000 |
Basis on variable rate, adjustment | 1.00% |  |
Corresponding change in annual interest expense | $ 4,000,000.0 |  |
Credit Facility | Credit facility | Revolver |  |  |
Concentration Risk [Line Items] |  |  |
Unused borrowing availability under the revolving facility | 92,700,000 | 129,300,000 |
Unused borrowing availability under finance lease obligations | 86,700,000 | 60,100,000 |
Interest Rate Swap |  |  |
Concentration Risk [Line Items] |  |  |
Unrealized gain | $ 3,952,000 |  |
Common stock, fair value per share (in usd per share) | $ / shares |  |  | $ 30.98
Realized gain |  | $ 229,000 |

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