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Plant and equipment (Details) - CAD
CAD in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Cost CAD 317,329 CAD 331,352
Accumulated depreciation 164,352 153,985
Net book value 152,977 177,367
Assets under capital lease, cost 143,983 115,798
Assets under capital lease, accumulated depreciation 40,508 34,413
Assets under capital lease, net book value 103,475 81,385
Total plant and equipment, cost 461,312 447,150
Total accumulated depreciation 204,860 188,398
Total plant and equipment, net book value 256,452 258,752
Addition of plant and equipment by means of capital leases 23,490 20,058
Heavy equipment    
Property, Plant and Equipment [Line Items]    
Cost 139,844 144,754
Accumulated depreciation 51,358 46,292
Net book value 88,486 98,462
Major component parts in use    
Property, Plant and Equipment [Line Items]    
Cost 115,111 117,042
Accumulated depreciation 66,905 61,464
Net book value 48,206 55,578
Other equipment    
Property, Plant and Equipment [Line Items]    
Cost 29,729 39,727
Accumulated depreciation 16,232 19,580
Net book value 13,497 20,147
Licensed motor vehicles    
Property, Plant and Equipment [Line Items]    
Cost 20,353 17,362
Accumulated depreciation 18,258 15,388
Net book value 2,095 1,974
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Cost 9,769 9,743
Accumulated depreciation 9,112 8,643
Net book value 657 1,100
Buildings    
Property, Plant and Equipment [Line Items]    
Cost 2,523 2,724
Accumulated depreciation 2,487 2,618
Net book value 36 106
Assets held under capital leases    
Property, Plant and Equipment [Line Items]    
Depreciation expense 18,536 14,027
Heavy equipment    
Property, Plant and Equipment [Line Items]    
Assets under capital lease, cost 133,468 105,580
Assets under capital lease, accumulated depreciation 38,978 29,738
Assets under capital lease, net book value 94,490 75,842
Other equipment    
Property, Plant and Equipment [Line Items]    
Assets under capital lease, cost 7,119 1,851
Assets under capital lease, accumulated depreciation 714 484
Assets under capital lease, net book value 6,405 1,367
Licensed motor vehicles    
Property, Plant and Equipment [Line Items]    
Assets under capital lease, cost 3,373 8,344
Assets under capital lease, accumulated depreciation 805 4,186
Assets under capital lease, net book value 2,568 4,158
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Assets under capital lease, cost 23 23
Assets under capital lease, accumulated depreciation 11 5
Assets under capital lease, net book value CAD 12 CAD 18