Long-term debt - Schedule of long term debt (Details) - CAD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Long-term Debt, Excluding Current Maturities [Abstract]
Equipment financing	$ 803,593	$ 692,619
Unamortized deferred financing costs	(2,596)	(3,514)
Less: current portion of long-term debt	(84,194)	(81,306)
Long-term portion of debt	719,399	611,313
Long-term Debt, Fiscal Year Maturity [Abstract]
2025	84,200
2026	117,300
2027	456,200
2028	101,900
2029 and thereafter	46,600
Credit Facility
Long-term Debt, Excluding Current Maturities [Abstract]
Long-term debt, gross	395,844	317,488
Convertible debentures
Long-term Debt, Excluding Current Maturities [Abstract]
Long-term debt, gross	129,106	129,750
Equipment financing
Long-term Debt, Excluding Current Maturities [Abstract]
Equipment financing	253,639	220,466
Mortgage
Long-term Debt, Excluding Current Maturities [Abstract]
Long-term debt, gross	$ 27,600	$ 28,429

Long-Term Debt, Maturity, Year Five And Thereafter

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, including portion classified as current.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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