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Property. plant and equipment (Details) - CAD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Owned assets, cost $ 776,801 $ 651,504
Owned assets, accumulated depreciation 259,039 202,915
Owned assets, net book value 517,762 448,589
Assets under finance lease, cost 159,585 212,410
Assets under finance least, accumulated depreciation 43,643 73,270
Net book value of property, plant and equipment under finance leases 115,942 139,140
Total plant and equipment, cost 936,386 863,914
Property, plant and equipment, accumulated depreciation 302,682 276,185
Property, plant and equipment, net of accumulated depreciation $302,682 (2019 – $276,185) 633,704 587,729
Heavy equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 352,948 299,298
Owned assets, accumulated depreciation 102,624 70,031
Owned assets, net book value 250,324 229,267
Assets under finance lease, cost 97,871 132,270
Assets under finance least, accumulated depreciation 25,454 43,466
Net book value of property, plant and equipment under finance leases 72,417 88,804
Major component parts in use    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 326,022 252,328
Owned assets, accumulated depreciation 111,583 92,161
Owned assets, net book value 214,439 160,167
Assets under finance lease, cost 52,798 71,706
Assets under finance least, accumulated depreciation 16,264 27,918
Net book value of property, plant and equipment under finance leases 36,534 43,788
Other equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 41,934 40,344
Owned assets, accumulated depreciation 27,041 25,328
Owned assets, net book value 14,893 15,016
Assets under finance lease, cost 5,287 2,126
Assets under finance least, accumulated depreciation 966 264
Net book value of property, plant and equipment under finance leases 4,321 1,862
Licensed motor vehicles    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 16,387 14,270
Owned assets, accumulated depreciation 10,592 9,463
Owned assets, net book value 5,795 4,807
Assets under finance lease, cost 3,629 5,617
Assets under finance least, accumulated depreciation 959 1,551
Net book value of property, plant and equipment under finance leases 2,670 4,066
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 6,337 5,154
Owned assets, accumulated depreciation 4,137 3,511
Owned assets, net book value 2,200 1,643
Assets under finance lease, cost   691
Assets under finance least, accumulated depreciation   71
Net book value of property, plant and equipment under finance leases   620
Land    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 10,472 13,829
Owned assets, accumulated depreciation 0 0
Owned assets, net book value 10,472 13,829
Buildings    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 22,701 26,281
Owned assets, accumulated depreciation 3,062 2,421
Owned assets, net book value $ 19,639 $ 23,860