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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of depreciation of 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 |  | Units of production |  | 3,000 - 120,000 hours
Major component parts in use |  | Units of production |  | 3,000 - 50,000 hours
Other equipment |  | Straight-line |  | 5 - 10 years
Licensed motor vehicles |  | Straight-line |  | 5 - 10 years
Office and computer equipment |  | Straight-line |  | 5 years
Furnishings, fixtures and facilities |  | Straight-line |  | 10 - 30 years
Buildings |  | Straight-line |  | 10 - 50 years
Leasehold improvements |  | Straight-line |  | Over shorter of estimated useful life and lease term
Land |  | No depreciation |  | No depreciation
December 31, 2018 |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 346,071 |  |  | $ | 78,296 |  |  | $ | 267,775 |
Major component parts in use |  | 143,032 |  |  | 66,019 |  |  | 77,013 |
Other equipment |  | 33,824 |  |  | 21,711 |  |  | 12,113 |
Licensed motor vehicles |  | 19,745 |  |  | 15,618 |  |  | 4,127 |
Office and computer equipment |  | 8,972 |  |  | 6,450 |  |  | 2,522 |
Land |  | 11,095 |  |  | — |  |  | 11,095 |
Buildings |  | 31,425 |  |  | 6,265 |  |  | 25,160 |
Leasehold improvements |  | 2,875 |  |  | 1,053 |  |  | 1,822 |
|  | 597,039 |  |  | 195,412 |  |  | 401,627 |
Assets under capital lease |  |  |  |  |  |
Heavy equipment |  | 110,759 |  |  | 35,376 |  |  | 75,383 |
Major component parts in use |  | 64,602 |  |  | 16,964 |  |  | 47,638 |
Other equipment |  | 772 |  |  | 17 |  |  | 755 |
Licensed motor vehicles |  | 3,822 |  |  | 1,087 |  |  | 2,735 |
Office and computer equipment |  | 23 |  |  | 23 |  |  | — |
Buildings |  | 25 |  |  | 6 |  |  | 19 |
|  | 180,003 |  |  | 53,473 |  |  | 126,530 |
Total property, plant and equipment |  | $ | 777,042 |  |  | $ | 248,885 |  |  | $ | 528,157 |
December 31, 2017 |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 196,045 |  |  | $ | 77,726 |  |  | $ | 118,319 |
Major component parts in use |  | 72,448 |  |  | 45,694 |  |  | 26,754 |
Other equipment |  | 31,923 |  |  | 18,400 |  |  | 13,523 |
Licensed motor vehicles |  | 18,298 |  |  | 14,888 |  |  | 3,410 |
Office and computer equipment |  | 10,157 |  |  | 9,468 |  |  | 689 |
Land |  | 7,168 |  |  | — |  |  | 7,168 |
Buildings |  | 2,547 |  |  | 2,482 |  |  | 65 |
|  | 338,586 |  |  | 168,658 |  |  | 169,928 |
Assets under capital lease |  |  |  |  |  |
Heavy equipment |  | 69,657 |  |  | 28,613 |  |  | 41,044 |
Major component parts in use |  | 85,015 |  |  | 21,247 |  |  | 63,768 |
Other equipment |  | 558 |  |  | 543 |  |  | 15 |
Licensed motor vehicles |  | 5,129 |  |  | 1,242 |  |  | 3,887 |
Office and computer equipment |  | 23 |  |  | 17 |  |  | 6 |
|  | 160,382 |  |  | 51,662 |  |  | 108,720 |
Total property, plant and equipment |  | $ | 498,968 |  |  | $ | 220,320 |  |  | $ | 278,648 |
Schedule of useful lives of definite lived intangible assets | Estimated useful lives of definite lived intangible assets and corresponding amortization method are:
Assets |  | Basis |  | Rate
Internal-use software |  | Straight-line |  | 4 years
Customer contracts |  | Straight-line |  | 1 - 2 years
Favourable land lease |  | Straight-line |  | 27 years
Assembled workforce |  | Straight-line |  | 5 years
Partnership relationship |  | Straight-line |  | 5 years
Brand |  | Straight-line |  | 5 years
December 31, 2018 |  | Cost |  |  | Accumulated amortization |  |  | Net book value |
Internal-use software |  | $ | 11,925 |  |  | $ | 11,019 |  |  | $ | 906 |
Other intangible assets |  | 2,010 |  |  | — |  |  | 2,010 |
|  | $ | 13,935 |  |  | $ | 11,019 |  |  | $ | 2,916 |
December 31, 2017 |  | Cost |  |  | Accumulated amortization |  |  | Net book value |
Internal-use software |  | $ | 18,188 |  |  | $ | 17,250 |  |  | $ | 938 |

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