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Property. plant and equipment (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | $ 651,504 | $ 597,039
Owned assets, accumulated depreciation | 202,915 | 195,412
Owned assets, net book value | 448,589 | 401,627
Assets under finance lease, cost | 212,410 |
Assets under finance least, accumulated depreciation | 73,270 |
Assets under finance lease, net book value | 139,140 |
Total plant and equipment, cost | 863,914 |
Total accumulated depreciation | 276,185 |
Total plant and equipment, net book value | 587,729 |
Assets under capital lease, cost |  | 180,003
Assets under capital lease, accumulated depreciation |  | 53,473
Assets under capital lease, net book value |  | 126,530
Total, property, plant and equipment, cost |  | 777,042
Total property, plant and equipment, accumulated depreciation | 276,185 | 248,885
Total property, plant and equipment, net book value |  | 528,157
Addition of property, plant and equipment by means of capital leases | 28,107 | 21,904
Sale leaseback transactions |  | 29,295
Heavy equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 299,298 | 346,071
Owned assets, accumulated depreciation | 70,031 | 78,296
Owned assets, net book value | 229,267 | 267,775
Assets under finance lease, cost | 132,270 |
Assets under finance least, accumulated depreciation | 43,466 |
Assets under finance lease, net book value | 88,804 |
Assets under capital lease, cost |  | 110,759
Assets under capital lease, accumulated depreciation |  | 35,376
Assets under capital lease, net book value |  | 75,383
Major component parts in use |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 252,328 | 143,032
Owned assets, accumulated depreciation | 92,161 | 66,019
Owned assets, net book value | 160,167 | 77,013
Assets under finance lease, cost | 71,706 |
Assets under finance least, accumulated depreciation | 27,918 |
Assets under finance lease, net book value | 43,788 |
Assets under capital lease, cost |  | 64,602
Assets under capital lease, accumulated depreciation |  | 16,964
Assets under capital lease, net book value |  | 47,638
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 40,344 | 33,824
Owned assets, accumulated depreciation | 25,328 | 21,711
Owned assets, net book value | 15,016 | 12,113
Assets under finance lease, cost | 2,126 |
Assets under finance least, accumulated depreciation | 264 |
Assets under finance lease, net book value | 1,862 |
Assets under capital lease, cost |  | 772
Assets under capital lease, accumulated depreciation |  | 17
Assets under capital lease, net book value |  | 755
Licensed motor vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 14,270 | 19,745
Owned assets, accumulated depreciation | 9,463 | 15,618
Owned assets, net book value | 4,807 | 4,127
Assets under finance lease, cost | 5,617 |
Assets under finance least, accumulated depreciation | 1,551 |
Assets under finance lease, net book value | 4,066 |
Assets under capital lease, cost |  | 3,822
Assets under capital lease, accumulated depreciation |  | 1,087
Assets under capital lease, net book value |  | 2,735
Office and computer equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 5,154 | 8,972
Owned assets, accumulated depreciation | 3,511 | 6,450
Owned assets, net book value | 1,643 | 2,522
Assets under finance lease, cost | 691 |
Assets under finance least, accumulated depreciation | 71 |
Assets under finance lease, net book value | 620 |
Assets under capital lease, cost |  | 23
Assets under capital lease, accumulated depreciation |  | 23
Assets under capital lease, net book value |  | 0
Land |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 13,829 | 11,095
Owned assets, accumulated depreciation | 0 | 0
Owned assets, net book value | 13,829 | 11,095
Buildings |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 26,281 | 31,425
Owned assets, accumulated depreciation | 2,421 | 6,265
Owned assets, net book value | $ 23,860 | 25,160
Assets under capital lease, cost |  | 25
Assets under capital lease, accumulated depreciation |  | 6
Assets under capital lease, net book value |  | 19
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost |  | 2,875
Owned assets, accumulated depreciation |  | 1,053
Owned assets, net book value |  | $ 1,822

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