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Property. plant and equipment (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Owned assets, cost $ 903,105 $ 827,779
Owned assets, accumulated depreciation 334,546 286,953
Owned assets, net book value 568,559 540,826
Assets under finance lease, cost 130,063 152,676
Assets under finance least, accumulated depreciation 52,812 52,552
Assets under finance lease, net book value 77,251 100,124
Total plant and equipment, cost 1,033,168 980,455
Property, plant and equipment, accumulated depreciation 387,358 339,505
Property, plant and equipment, net of accumulated depreciation 645,810 640,950
Heavy equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 368,318 351,023
Owned assets, accumulated depreciation 123,695 105,686
Owned assets, net book value 244,623 245,337
Assets under finance lease, cost 75,750 92,690
Assets under finance least, accumulated depreciation 28,265 28,504
Assets under finance lease, net book value 47,485 64,186
Major component parts in use    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 388,169 332,042
Owned assets, accumulated depreciation 163,124 131,157
Owned assets, net book value 225,045 200,885
Assets under finance lease, cost 40,406 52,679
Assets under finance least, accumulated depreciation 22,264 21,996
Assets under finance lease, net book value 18,142 30,683
Other equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 40,752 44,548
Owned assets, accumulated depreciation 30,769 30,633
Owned assets, net book value 9,983 13,915
Assets under finance lease, cost 4,238 4,633
Assets under finance least, accumulated depreciation 1,814 1,281
Assets under finance lease, net book value 2,424 3,352
Licensed motor vehicles    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 12,109 15,113
Owned assets, accumulated depreciation 6,800 10,838
Owned assets, net book value 5,309 4,275
Assets under finance lease, cost 9,669 2,674
Assets under finance least, accumulated depreciation 469 771
Assets under finance lease, net book value 9,200 1,903
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 7,510 6,845
Owned assets, accumulated depreciation 5,669 4,891
Owned assets, net book value 1,841 1,954
Buildings    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 29,725 29,386
Owned assets, accumulated depreciation 4,489 3,748
Owned assets, net book value 25,236 25,638
Capital inventory and capital work in progress    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 46,050 38,350
Owned assets, accumulated depreciation 0 0
Owned assets, net book value 46,050 38,350
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