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Income taxes (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
provincial_jurisdiction
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]    
Loss from continuing operations before income taxes (24,149) (42,778)
Tax rate 25.26% 25.12%
Expected benefit (6,101) (10,746)
(Decrease) increase related to:    
Impact of enacted future statutory income tax rates (209) 160
Income tax adjustments and reassessments (249) 407
Non deductible portion of capital losses 69 (137)
Stock-based compensation 315 112
Other 73 (78)
Income tax benefit (6,102) (10,282)
Current income tax (benefit) expense (2,438) 1,030
Deferred income tax (benefit) (note 10) (3,664) (11,312)
Deferred tax assets:    
Non-capital losses 39,604 54,086
Deferred financing costs 1,709 0
Derivative financial instruments 0 1,646
Billings in excess of costs on uncompleted contracts 1,606 2,451
Capital lease obligations 10,914 12,462
Deferred lease inducements 91 114
Stock-based compensation 1,880 1,001
Other 409 510
Total deferred tax assets 56,213 72,270
Deferred tax liabilities:    
Unbilled revenue and uncertified revenue included in accounts receivable 5,338 12,097
Assets held for sale 13 63
Accounts receivable – holdbacks 2,308 8,379
Property, plant and equipment 56,945 67,257
Deferred financing costs 0 277
Intangible assets 0 8
Deferred partnership income 18,125 0
Total deferred tax liabilities 82,729 88,081
Net deferred income tax liability (26,516) (15,811)
Net deferred tax liability classification    
Current asset 3,678 4,396
Long term asset 27,660 56,814
Current liability (8,036) (19,082)
Long term liability (49,818) (57,939)
Net deferred income tax liability (26,516) (15,811)
Number of provincial jurisdictions 5  
Operating loss carryforwards 156,784  
2027
    
Net deferred tax liability classification    
Operating loss carryforwards 283  
2028
    
Net deferred tax liability classification    
Operating loss carryforwards 0  
2029
    
Net deferred tax liability classification    
Operating loss carryforwards 13,676  
2030
    
Net deferred tax liability classification    
Operating loss carryforwards 1  
2031
    
Net deferred tax liability classification    
Operating loss carryforwards 21,368  
2032
    
Net deferred tax liability classification    
Operating loss carryforwards 40,830  
2033
    
Net deferred tax liability classification    
Operating loss carryforwards 55,160  
2034
    
Net deferred tax liability classification    
Operating loss carryforwards 25,466  
Capital loss carryforward
    
Net deferred tax liability classification    
Valuation allowance, amount 962 962