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Discontinued operations (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
reportable_segment
Dec. 31, 2012
Dec. 31, 2013
Pipeline
Dec. 31, 2012
Pipeline
Nov. 22, 2012
Pipeline
Jul. 13, 2012
Piling
Dec. 31, 2013
Piling
Dec. 31, 2012
Piling
Jul. 12, 2013
Piling
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Number of reportable business segments 2                
Total consideration received upon disposal         16,250       227,500
Selling costs of disposal group         781       8,102
Additional entitlement contingent on purchaser achieving profit milestones from assets sold                 92,500
Additional entitlement contingency period                 3 years
Results of discontinued operations                  
Revenue     0 84,399     98,735 242,106  
Project costs     1,321 93,442     79,472 178,970  
Equipment operating lease expense             1,242 2,315  
Depreciation     0 556     706 3,706  
Gross profit (loss)     (1,321) (9,599)     17,315 57,115  
General and administrative expenses     312 1,277     6,857 12,518  
Amortization of intangible assets             351 1,410  
Net gain           (98,065) (98,065) 0  
Loss (gain) on disposal of property, plant and equipment     63 (438)          
Recovery of previously expensed tools, supplies and equipment parts     0 (1,095)          
Gain on sale of inventory     (46) (668)          
Operating income (loss)     (1,650) (8,675)     108,172 43,187  
Interest expense     0 962     4,758 7,557  
Loss before income taxes     (1,650) (9,637)     103,414 35,630  
Current income tax expense             164 0  
Deferred income tax benefit     (510) (2,003)     14,879 9,173  
Income (Loss) from discontinued operations     (1,140) (7,634)     88,371 26,457  
Cash provided by (used in) the discontinued operations                  
Operating activities 45,739 (1,894) (1,587) (8,267)     47,326 6,373  
Investing activities 182,836 5,927 0 11,197     182,836 (5,270)  
Financing activities (271) (720)         (271) (720)  
Total cash provided by (used in) discontinued operations 228,304 3,313 (1,587) 2,930     229,891 383  
Discontinued Operation, Summary of Transaction [Abstract]                  
Proceeds         16,250       227,500
Working capital adjustment                 (5,863)
Selling costs of disposal group         781       8,102
Net proceeds         15,469       219,392
Non-cash working capital                 33,699
Property, plant, and equipment, net                 56,377
Intangibles                 4,219
Goodwill                 32,901
Capital lease obligation                 (5,869)
Net gain           98,065 98,065 0