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Long-term debt - Credit facility narrative (Details)	12 Months Ended
	Dec. 31, 2024 CAD ($) covenant	Oct. 24, 2024 CAD ($)	Oct. 24, 2024 AUD ($)	Oct. 23, 2024 CAD ($)	Oct. 23, 2024 AUD ($)	Dec. 31, 2023 CAD ($)
Line of Credit Facility [Line Items]
Financing costs	$ 6,336,000					$ 6,336,000
Credit facility | Financial Guarantee | Mikisew North American Limited Partnership ("MNALP")
Line of Credit Facility [Line Items]
Maximum borrowing capacity of credit facility	115,000,000.0
Revolver | Credit facility | Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity of credit facility	522,600,000
Finance lease borrowing limit		$ 400,000,000		$ 350,000,000
Other outstanding debt limit		20,000,000
Financing costs	1,000,000
Amount outstanding during period	34,000,000.0					31,300,000
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
Number of financial covenants | covenant	2
Total debt to bank EBITDA ratio	3.5
Fixed charge ratio	3
Revolver | Credit facility | Credit Facility | Canadian dollar
Line of Credit Facility [Line Items]
Maximum borrowing capacity of credit facility		$ 300,000,000		$ 280,000,000
Revolver | Credit facility | Credit Facility | Australian dollar
Line of Credit Facility [Line Items]
Maximum borrowing capacity of credit facility			$ 250,000,000		$ 220,000,000
Revolver | Credit facility | Credit Facility | Financial Guarantee
Line of Credit Facility [Line Items]
Credit facilities	$ 61,700,000
Revolver | Credit facility | Credit Facility | Minimum
Line of Credit Facility [Line Items]
Standby fees percentage	0.40%
Revolver | Credit facility | Credit Facility | Maximum
Line of Credit Facility [Line Items]
Standby fees percentage	0.70%

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Debt Instrument, Covenant Terms, Fixed Charge Ratio

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Line of Credit Facility, Finance Lease, Maximum Borrowing Capacity

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Line of Credit Facility, Finance Lease, Remaining Borrowing Capacity

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Line of Credit Facility, Allowable Other Debt Outstanding Limit

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Publisher FASB
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Section S99
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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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