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Credit facilities and long-term debt - Letters of Credit and Bonds Issued (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Available facility amount $ 254,623 $ 202,346
Letters Of Credit Facilities With Banks    
Disclosure of detailed information about borrowings [line items]    
Facility amount 60,000 55,000
Less letters of credit issued in support of: 11,637 12,534
Available facility amount 48,363 42,466
Letters Of Credit Facilities With Banks | Insurance programs    
Disclosure of detailed information about borrowings [line items]    
Less letters of credit issued in support of: (11,302) (12,199)
Letters Of Credit Facilities With Banks | Performance obligations    
Disclosure of detailed information about borrowings [line items]    
Less letters of credit issued in support of: (100) (100)
Letters Of Credit Facilities With Banks | Other payment obligations    
Disclosure of detailed information about borrowings [line items]    
Less letters of credit issued in support of: (235) (235)
Performance Bond Facility    
Disclosure of detailed information about borrowings [line items]    
Facility amount 60,000 60,000
Less letters of credit issued in support of: 18,761 35,140
Available facility amount 41,239 24,860
Performance Bond Facility | Other payment obligations    
Disclosure of detailed information about borrowings [line items]    
Less letters of credit issued in support of: (10,178) (26,557)
Performance Bond Facility | Excavation and reclamation obligations    
Disclosure of detailed information about borrowings [line items]    
Less letters of credit issued in support of: (4,954) (4,954)
Performance Bond Facility | Surety bond    
Disclosure of detailed information about borrowings [line items]    
Less letters of credit issued in support of: $ (3,629) $ (3,629)