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Property. plant and equipment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Owned assets, cost $ 651,504 $ 597,039
Owned assets, accumulated depreciation 202,915 195,412
Owned assets, net book value 448,589 401,627
Assets under finance lease, cost 212,410  
Assets under finance least, accumulated depreciation 73,270  
Assets under finance lease, net book value 139,140  
Total plant and equipment, cost 863,914  
Total accumulated depreciation 276,185  
Total plant and equipment, net book value 587,729  
Assets under capital lease, cost   180,003
Assets under capital lease, accumulated depreciation   53,473
Assets under capital lease, net book value   126,530
Total, property, plant and equipment, cost   777,042
Total property, plant and equipment, accumulated depreciation 276,185 248,885
Total property, plant and equipment, net book value   528,157
Addition of property, plant and equipment by means of capital leases 28,107 21,904
Sale leaseback transactions   29,295
Heavy equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 299,298 346,071
Owned assets, accumulated depreciation 70,031 78,296
Owned assets, net book value 229,267 267,775
Assets under finance lease, cost 132,270  
Assets under finance least, accumulated depreciation 43,466  
Assets under finance lease, net book value 88,804  
Assets under capital lease, cost   110,759
Assets under capital lease, accumulated depreciation   35,376
Assets under capital lease, net book value   75,383
Major component parts in use    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 252,328 143,032
Owned assets, accumulated depreciation 92,161 66,019
Owned assets, net book value 160,167 77,013
Assets under finance lease, cost 71,706  
Assets under finance least, accumulated depreciation 27,918  
Assets under finance lease, net book value 43,788  
Assets under capital lease, cost   64,602
Assets under capital lease, accumulated depreciation   16,964
Assets under capital lease, net book value   47,638
Other equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 40,344 33,824
Owned assets, accumulated depreciation 25,328 21,711
Owned assets, net book value 15,016 12,113
Assets under finance lease, cost 2,126  
Assets under finance least, accumulated depreciation 264  
Assets under finance lease, net book value 1,862  
Assets under capital lease, cost   772
Assets under capital lease, accumulated depreciation   17
Assets under capital lease, net book value   755
Licensed motor vehicles    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 14,270 19,745
Owned assets, accumulated depreciation 9,463 15,618
Owned assets, net book value 4,807 4,127
Assets under finance lease, cost 5,617  
Assets under finance least, accumulated depreciation 1,551  
Assets under finance lease, net book value 4,066  
Assets under capital lease, cost   3,822
Assets under capital lease, accumulated depreciation   1,087
Assets under capital lease, net book value   2,735
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 5,154 8,972
Owned assets, accumulated depreciation 3,511 6,450
Owned assets, net book value 1,643 2,522
Assets under finance lease, cost 691  
Assets under finance least, accumulated depreciation 71  
Assets under finance lease, net book value 620  
Assets under capital lease, cost   23
Assets under capital lease, accumulated depreciation   23
Assets under capital lease, net book value   0
Land    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 13,829 11,095
Owned assets, accumulated depreciation 0 0
Owned assets, net book value 13,829 11,095
Buildings    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 26,281 31,425
Owned assets, accumulated depreciation 2,421 6,265
Owned assets, net book value $ 23,860 25,160
Assets under capital lease, cost   25
Assets under capital lease, accumulated depreciation   6
Assets under capital lease, net book value   19
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Owned assets, cost   2,875
Owned assets, accumulated depreciation   1,053
Owned assets, net book value   $ 1,822