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v3.19.3.a.u2

Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2019
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 |  | 4 - 10 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, 2019 |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 299,298 |  |  | $ | 70,031 |  |  | $ | 229,267 |
Major component parts in use |  | 252,328 |  |  | 92,161 |  |  | 160,167 |
Other equipment |  | 40,344 |  |  | 25,328 |  |  | 15,016 |
Licensed motor vehicles |  | 14,270 |  |  | 9,463 |  |  | 4,807 |
Office and computer equipment |  | 5,154 |  |  | 3,511 |  |  | 1,643 |
Land |  | 13,829 |  |  | — |  |  | 13,829 |
Buildings |  | 26,281 |  |  | 2,421 |  |  | 23,860 |
|  | 651,504 |  |  | 202,915 |  |  | 448,589 |
Assets under finance lease |  |  |  |  |  |
Heavy equipment |  | 132,270 |  |  | 43,466 |  |  | 88,804 |
Major component parts in use |  | 71,706 |  |  | 27,918 |  |  | 43,788 |
Other equipment |  | 2,126 |  |  | 264 |  |  | 1,862 |
Licensed motor vehicles |  | 5,617 |  |  | 1,551 |  |  | 4,066 |
Office and computer equipment |  | 691 |  |  | 71 |  |  | 620 |
|  | 212,410 |  |  | 73,270 |  |  | 139,140 |
Total property, plant and equipment |  | $ | 863,914 |  |  | $ | 276,185 |  |  | $ | 587,729 |
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 finance 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 |
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

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