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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 |

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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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