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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

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