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Property. plant and equipment (Details) - CAD
CAD in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Owned assets, cost CAD 338,586 CAD 317,329
Owned assets, accumulated depreciation 168,658 164,352
Owned assets, net book value 169,928 152,977
Assets under capital lease, cost 160,382 143,983
Assets under capital lease, accumulated depreciation 51,662 40,508
Assets under capital lease, net book value 108,720 103,475
Total plant and equipment, cost 498,968 461,312
Total accumulated depreciation 220,320 204,860
Total plant and equipment, net book value 278,648 256,452
Addition of property, plant and equipment by means of capital leases 34,730 23,490
Sale leaseback transactions 20,697 12,674
Heavy equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 196,045 188,785
Owned assets, accumulated depreciation 77,726 68,487
Owned assets, net book value 118,319 120,298
Assets under capital lease, cost 69,657 84,527
Assets under capital lease, accumulated depreciation 28,613 21,848
Assets under capital lease, net book value 41,044 62,679
Major component parts in use    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 72,448 64,229
Owned assets, accumulated depreciation 45,694 49,673
Owned assets, net book value 26,754 14,556
Assets under capital lease, cost 85,015 50,882
Assets under capital lease, accumulated depreciation 21,247 17,233
Assets under capital lease, net book value 63,768 33,649
Other equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 31,923 31,670
Owned assets, accumulated depreciation 18,400 16,335
Owned assets, net book value 13,523 15,335
Assets under capital lease, cost 558 5,178
Assets under capital lease, accumulated depreciation 543 611
Assets under capital lease, net book value 15 4,567
Licensed motor vehicles    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 18,298 20,353
Owned assets, accumulated depreciation 14,888 18,258
Owned assets, net book value 3,410 2,095
Assets under capital lease, cost 5,129 3,373
Assets under capital lease, accumulated depreciation 1,242 805
Assets under capital lease, net book value 3,887 2,568
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 10,157 9,769
Owned assets, accumulated depreciation 9,468 9,112
Owned assets, net book value 689 657
Assets under capital lease, cost 23 23
Assets under capital lease, accumulated depreciation 17 11
Assets under capital lease, net book value 6 12
Land    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 7,168  
Owned assets, net book value 7,168  
Buildings    
Property, Plant and Equipment [Line Items]    
Owned assets, cost 2,547 2,523
Owned assets, accumulated depreciation 2,482 2,487
Owned assets, net book value 65 36
Assets held under capital leases    
Property, Plant and Equipment [Line Items]    
Depreciation expense CAD 19,483 CAD 18,536