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Property, plant and equipment (Details) (CAD) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |
Cost | 466,971 | 542,681
Accumulated Deprecation | 188,996 | 210,429
Net Book Value | 277,975 | 332,252
Acquisition of property, plant and equipment for continuing operations by means of capital leases | 13,812 | 53,774
Heavy equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 251,872 | 321,976
Accumulated Deprecation | 96,038 | 113,373
Net Book Value | 155,834 | 208,603
Major component parts in use |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 60,484 | 59,538
Accumulated Deprecation | 23,472 | 22,543
Net Book Value | 37,012 | 36,995
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 27,594 | 37,684
Accumulated Deprecation | 11,511 | 18,127
Net Book Value | 16,083 | 19,557
Licensed motor vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 25,911 | 32,010
Accumulated Deprecation | 22,474 | 25,333
Net Book Value | 3,437 | 6,677
Office and computer equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 13,846 | 13,122
Accumulated Deprecation | 11,882 | 10,630
Net Book Value | 1,964 | 2,492
Buildings |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 4,691 | 3,541
Accumulated Deprecation | 2,650 | 3,096
Net Book Value | 2,041 | 445
Land |  |
Property, Plant and Equipment [Line Items] |  |
Cost |  | 166
Accumulated Deprecation |  | 0
Net Book Value |  | 166
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 9,946 | 9,743
Accumulated Deprecation | 6,187 | 5,656
Net Book Value | 3,759 | 4,087
Assets under capital lease |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 72,627 | 64,901
Accumulated Deprecation | 14,782 | 11,671
Net Book Value | 57,845 | 53,230
Depreciation expense | 6,694 | 7,539

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition The increase during the period in capital lease obligations due to entering into new capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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