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Property. plant and equipment (Details) - CAD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Owned assets, cost $ 1,634,170 $ 1,470,494
Owned assets, accumulated depreciation 455,748 394,143
Owned assets, net book value 1,178,422 1,076,351
Assets under finance lease, cost 94,395 95,797
Assets under finance lease, accumulated depreciation 26,233 29,202
Assets under finance lease, net book value 68,162 66,595
Total property, plant and equipment, cost 1,728,565 1,566,291
Total property, plant and equipment, accumulated depreciation 481,981 423,345
Total property, plant and equipment, net book value 1,246,584 1,142,946
Heavy equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 598,377 503,359
Owned assets, accumulated depreciation 151,136 133,448
Owned assets, net book value 447,241 369,911
Assets under finance lease, cost 55,663 64,691
Assets under finance lease, accumulated depreciation 19,958 19,435
Assets under finance lease, net book value 35,705 45,256
Major component parts in use    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 775,672 747,036
Owned assets, accumulated depreciation 247,882 207,969
Owned assets, net book value 527,790 539,067
Assets under finance lease, cost 26,848 28,514
Assets under finance lease, accumulated depreciation 4,976 9,580
Assets under finance lease, net book value 21,872 18,934
Other equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 55,443 49,207
Owned assets, accumulated depreciation 35,901 33,952
Owned assets, net book value 19,542 15,255
Assets under finance lease, cost 3,941 37
Assets under finance lease, accumulated depreciation 713 12
Assets under finance lease, net book value 3,228 25
Licensed motor vehicles    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 19,684 20,051
Owned assets, accumulated depreciation 7,895 7,207
Owned assets, net book value 11,789 12,844
Assets under finance lease, cost 7,943 2,555
Assets under finance lease, accumulated depreciation 586 175
Assets under finance lease, net book value 7,357 2,380
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 10,224 10,133
Owned assets, accumulated depreciation 6,988 6,336
Owned assets, net book value 3,236 3,797
Buildings    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 45,469 45,681
Owned assets, accumulated depreciation 5,946 5,231
Owned assets, net book value 39,523 40,450
Capital inventory and capital work in progress    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 118,829 84,555
Owned assets, accumulated depreciation 0 0
Owned assets, net book value 118,829 84,555
Land    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 10,472 10,472
Owned assets, accumulated depreciation 0 0
Owned assets, net book value $ 10,472 $ 10,472