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Property, plant and equipment (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Cost 466,971 542,681
Accumulated Deprecation 188,996 210,429
Net Book Value 277,975 332,252
Acquisition of property, plant and equipment for continuing operations by means of capital leases 13,812 53,774
Heavy equipment
    
Property, Plant and Equipment [Line Items]    
Cost 251,872 321,976
Accumulated Deprecation 96,038 113,373
Net Book Value 155,834 208,603
Major component parts in use
    
Property, Plant and Equipment [Line Items]    
Cost 60,484 59,538
Accumulated Deprecation 23,472 22,543
Net Book Value 37,012 36,995
Other equipment
    
Property, Plant and Equipment [Line Items]    
Cost 27,594 37,684
Accumulated Deprecation 11,511 18,127
Net Book Value 16,083 19,557
Licensed motor vehicles
    
Property, Plant and Equipment [Line Items]    
Cost 25,911 32,010
Accumulated Deprecation 22,474 25,333
Net Book Value 3,437 6,677
Office and computer equipment
    
Property, Plant and Equipment [Line Items]    
Cost 13,846 13,122
Accumulated Deprecation 11,882 10,630
Net Book Value 1,964 2,492
Buildings
    
Property, Plant and Equipment [Line Items]    
Cost 4,691 3,541
Accumulated Deprecation 2,650 3,096
Net Book Value 2,041 445
Land
    
Property, Plant and Equipment [Line Items]    
Cost   166
Accumulated Deprecation   0
Net Book Value   166
Leasehold improvements
    
Property, Plant and Equipment [Line Items]    
Cost 9,946 9,743
Accumulated Deprecation 6,187 5,656
Net Book Value 3,759 4,087
Assets under capital lease
    
Property, Plant and Equipment [Line Items]    
Cost 72,627 64,901
Accumulated Deprecation 14,782 11,671
Net Book Value 57,845 53,230
Depreciation expense 6,694 7,539