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Plant and equipment (Details) - CAD
CAD in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Cost CAD 331,352 CAD 332,829  
Accumulated depreciation 153,985 148,530  
Net book value 177,367 184,299  
Assets under capital lease, cost 115,798 101,606  
Assets under capital lease, accumulated depreciation 34,413 25,007  
Assets under capital lease, net book value 81,385 76,599  
Total plant and equipment, cost 447,150 434,435  
Total accumulated depreciation 188,398 173,537  
Total plant and equipment, net book value 258,752 260,898  
Addition of plant and equipment by means of capital leases 20,058 39,492  
Heavy equipment      
Property, Plant and Equipment [Line Items]      
Cost 144,754 142,052  
Accumulated depreciation 46,292 42,292  
Net book value 98,462 99,760  
Major component parts in use      
Property, Plant and Equipment [Line Items]      
Cost 117,042 112,645  
Accumulated depreciation 61,464 55,895  
Net book value 55,578 56,750  
Other equipment      
Property, Plant and Equipment [Line Items]      
Cost 39,727 41,739  
Accumulated depreciation 19,580 18,758  
Net book value 20,147 22,981  
Licensed motor vehicles      
Property, Plant and Equipment [Line Items]      
Cost 17,362 24,247  
Accumulated depreciation 15,388 20,763  
Net book value 1,974 3,484  
Office and computer equipment      
Property, Plant and Equipment [Line Items]      
Cost 9,743 9,355  
Accumulated depreciation 8,643 8,216  
Net book value 1,100 1,139  
Buildings      
Property, Plant and Equipment [Line Items]      
Cost 2,724 2,791  
Accumulated depreciation 2,618 2,606  
Net book value 106 185  
Assets under capital lease      
Property, Plant and Equipment [Line Items]      
Depreciation expense 14,027 12,108 CAD 6,694
Heavy equipment      
Property, Plant and Equipment [Line Items]      
Assets under capital lease, cost 105,580 91,519  
Assets under capital lease, accumulated depreciation 29,738 21,275  
Assets under capital lease, net book value 75,842 70,244  
Other equipment      
Property, Plant and Equipment [Line Items]      
Assets under capital lease, cost 1,851 1,945  
Assets under capital lease, accumulated depreciation 484 291  
Assets under capital lease, net book value 1,367 1,654  
Licensed motor vehicles      
Property, Plant and Equipment [Line Items]      
Assets under capital lease, cost 8,344 8,142  
Assets under capital lease, accumulated depreciation 4,186 3,441  
Assets under capital lease, net book value 4,158 CAD 4,701  
Computer Equipment      
Property, Plant and Equipment [Line Items]      
Assets under capital lease, cost 23    
Assets under capital lease, accumulated depreciation 5    
Assets under capital lease, net book value CAD 18