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v3.20.4

Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2020
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 |  | 2,500 - 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, 2020 |  | Cost |  | Accumulated Depreciation |  | Net Book Value
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 352,948 |  |  | $ | 102,624 |  |  | $ | 250,324 |
Major component parts in use |  | 326,022 |  |  | 111,583 |  |  | 214,439 |
Other equipment |  | 41,934 |  |  | 27,041 |  |  | 14,893 |
Licensed motor vehicles |  | 16,387 |  |  | 10,592 |  |  | 5,795 |
Office and computer equipment |  | 6,337 |  |  | 4,137 |  |  | 2,200 |
Land |  | 10,472 |  |  | — |  |  | 10,472 |
Buildings |  | 22,701 |  |  | 3,062 |  |  | 19,639 |
|  | 776,801 |  |  | 259,039 |  |  | 517,762 |
Assets under finance lease |  |  |  |  |  |
Heavy equipment |  | 97,871 |  |  | 25,454 |  |  | 72,417 |
Major component parts in use |  | 52,798 |  |  | 16,264 |  |  | 36,534 |
Other equipment |  | 5,287 |  |  | 966 |  |  | 4,321 |
Licensed motor vehicles |  | 3,629 |  |  | 959 |  |  | 2,670 |
|  | 159,585 |  |  | 43,643 |  |  | 115,942 |
Total property, plant and equipment |  | $ | 936,386 |  |  | $ | 302,682 |  |  | $ | 633,704 |
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 |
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
Partnership relationship |  | Straight-line |  | 5 years

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