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Plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Depreciation is calculated based on the cost, net of the estimated residual value, over the estimated useful life of the assets on the following bases and rates:
Assets |  | Basis |  | Rate
Heavy equipment |  | Straight-line |  | Operating hours
Major component parts in use |  | Straight-line |  | Operating hours
Other equipment |  | Straight-line |  | 5 – 10 years
Licensed motor vehicles |  | Straight-line |  | 5 – 10 years
Office and computer equipment |  | Straight-line |  | 4 years
Buildings |  | Straight-line |  | 10 years
Leasehold improvements |  | Straight-line |  | Over shorter of estimated useful life and lease term
December 31, 2015 |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 144,754 |  |  | $ | 46,292 |  |  | $ | 98,462 |
Major component parts in use |  | 117,042 |  |  | 61,464 |  |  | 55,578 |
Other equipment |  | 39,727 |  |  | 19,580 |  |  | 20,147 |
Licensed motor vehicles |  | 17,362 |  |  | 15,388 |  |  | 1,974 |
Office and computer equipment |  | 9,743 |  |  | 8,643 |  |  | 1,100 |
Buildings |  | 2,724 |  |  | 2,618 |  |  | 106 |
|  | 331,352 |  |  | 153,985 |  |  | 177,367 |
Assets under capital lease |  |  |  |  |  |
Heavy equipment |  | 105,580 |  |  | 29,738 |  |  | 75,842 |
Other equipment |  | 1,851 |  |  | 484 |  |  | 1,367 |
Licensed motor vehicles |  | 8,344 |  |  | 4,186 |  |  | 4,158 |
Office and computer equipment |  | 23 |  |  | 5 |  |  | 18 |
|  | 115,798 |  |  | 34,413 |  |  | 81,385 |
Total plant and equipment |  | $ | 447,150 |  |  | $ | 188,398 |  |  | $ | 258,752 |
December 31, 2014 |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 142,052 |  |  | $ | 42,292 |  |  | $ | 99,760 |
Major component parts in use |  | 112,645 |  |  | 55,895 |  |  | 56,750 |
Other equipment |  | 41,739 |  |  | 18,758 |  |  | 22,981 |
Licensed motor vehicles |  | 24,247 |  |  | 20,763 |  |  | 3,484 |
Office and computer equipment |  | 9,355 |  |  | 8,216 |  |  | 1,139 |
Buildings |  | 2,791 |  |  | 2,606 |  |  | 185 |
|  | 332,829 |  |  | 148,530 |  |  | 184,299 |
Assets under capital lease |  |  |  |  |  |
Heavy equipment |  | 91,519 |  |  | 21,275 |  |  | 70,244 |
Other equipment |  | 1,945 |  |  | 291 |  |  | 1,654 |
Licensed motor vehicles |  | 8,142 |  |  | 3,441 |  |  | 4,701 |
|  | 101,606 |  |  | 25,007 |  |  | 76,599 |
Total plant and equipment |  | $ | 434,435 |  |  | $ | 173,537 |  |  | $ | 260,898 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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