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Discontinued operations (Details) - CAD
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Net (loss) income from discontinued operations CAD 0 CAD (472,000) CAD 87,231,000
Cash (used in) provided by discontinued operations (note 21)      
Operating activities 0 (472,000) 45,739,000
Investing activities 0 0 182,836,000
Financing activities 0 0 (271,000)
Total cash provided by (used in) discontinued operations CAD 0 CAD (472,000) 228,304,000
Piling      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Period to receive contingent consideration as part of sale 3 years    
Maximum | Piling      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Additional proceeds CAD 92,500    
Discontinued Operations, Disposed of by Sale      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Revenue     98,735,000
Project costs     80,793,000
Equipment costs     1,242,000
Depreciation     706,000
Gross (loss) profit     15,994,000
General and administrative expenses     7,169,000
Loss (gain) on disposal of assets and liabilities     (98,002,000)
Gain on sale of inventory     (46,000)
Amortization of intangible assets     351,000
Operating (loss) income     106,522,000
Interest expense     4,758,000
(Loss) income before income taxes     101,764,000
Current income tax expense     164,000
Deferred income tax (benefit) expense     14,369,000
Net (loss) income from discontinued operations     87,231,000
Cash (used in) provided by discontinued operations (note 21)      
Operating activities     45,739,000
Investing activities     182,836,000
Financing activities     (271,000)
Total cash provided by (used in) discontinued operations     228,304,000
Discontinued Operations, Disposed of by Sale | Pipelines      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Revenue     0
Project costs     1,321,000
Equipment costs     0
Depreciation     0
Gross (loss) profit     (1,321,000)
General and administrative expenses     312,000
Loss (gain) on disposal of assets and liabilities     63,000
Gain on sale of inventory     (46,000)
Amortization of intangible assets     0
Operating (loss) income     (1,650,000)
Interest expense     0
(Loss) income before income taxes     (1,650,000)
Current income tax expense     0
Deferred income tax (benefit) expense     (510,000)
Net (loss) income from discontinued operations     (1,140,000)
Cash (used in) provided by discontinued operations (note 21)      
Operating activities     (1,587,000)
Investing activities     0
Financing activities     0
Total cash provided by (used in) discontinued operations     (1,587,000)
Discontinued Operations, Disposed of by Sale | Piling      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Revenue     98,735,000
Project costs     79,472,000
Equipment costs     1,242,000
Depreciation     706,000
Gross (loss) profit     17,315,000
General and administrative expenses     6,857,000
Loss (gain) on disposal of assets and liabilities     (98,065,000)
Gain on sale of inventory     0
Amortization of intangible assets     351,000
Operating (loss) income     108,172,000
Interest expense     4,758,000
(Loss) income before income taxes     103,414,000
Current income tax expense     164,000
Deferred income tax (benefit) expense     14,879,000
Net (loss) income from discontinued operations     88,371,000
Cash (used in) provided by discontinued operations (note 21)      
Operating activities     47,326,000
Investing activities     182,836,000
Financing activities     (271,000)
Total cash provided by (used in) discontinued operations     CAD 229,891,000