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Property. plant and equipment (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | $ 597,039 | $ 338,586
Owned assets, accumulated depreciation | 195,412 | 168,658
Owned assets, net book value | 401,627 | 169,928
Assets under capital lease, cost | 180,003 | 160,382
Assets under capital lease, accumulated depreciation | 53,473 | 51,662
Assets under capital lease, net book value | 126,530 | 108,720
Total plant and equipment, cost | 777,042 | 498,968
Total accumulated depreciation | 248,885 | 220,320
Total plant and equipment, net book value | 528,157 | 278,648
Addition of property, plant and equipment by means of capital leases | 21,904 | 14,033
Sale leaseback transactions | 29,295 | 20,697
Heavy equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 346,071 | 196,045
Owned assets, accumulated depreciation | 78,296 | 77,726
Owned assets, net book value | 267,775 | 118,319
Assets under capital lease, cost | 110,759 | 69,657
Assets under capital lease, accumulated depreciation | 35,376 | 28,613
Assets under capital lease, net book value | 75,383 | 41,044
Major component parts in use |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 143,032 | 72,448
Owned assets, accumulated depreciation | 66,019 | 45,694
Owned assets, net book value | 77,013 | 26,754
Assets under capital lease, cost | 64,602 | 85,015
Assets under capital lease, accumulated depreciation | 16,964 | 21,247
Assets under capital lease, net book value | 47,638 | 63,768
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 33,824 | 31,923
Owned assets, accumulated depreciation | 21,711 | 18,400
Owned assets, net book value | 12,113 | 13,523
Assets under capital lease, cost | 772 | 558
Assets under capital lease, accumulated depreciation | 17 | 543
Assets under capital lease, net book value | 755 | 15
Licensed motor vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 19,745 | 18,298
Owned assets, accumulated depreciation | 15,618 | 14,888
Owned assets, net book value | 4,127 | 3,410
Assets under capital lease, cost | 3,822 | 5,129
Assets under capital lease, accumulated depreciation | 1,087 | 1,242
Assets under capital lease, net book value | 2,735 | 3,887
Office and computer equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 8,972 | 10,157
Owned assets, accumulated depreciation | 6,450 | 9,468
Owned assets, net book value | 2,522 | 689
Assets under capital lease, cost | 23 | 23
Assets under capital lease, accumulated depreciation | 23 | 17
Assets under capital lease, net book value | 0 | 6
Land |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 11,095 | 7,168
Owned assets, net book value | 11,095 | 7,168
Buildings |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 31,425 | 2,547
Owned assets, accumulated depreciation | 6,265 | 2,482
Owned assets, net book value | 25,160 | 65
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 |
Assets held under capital leases |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation expense | $ 25,995 | $ 19,483

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land or leased assets). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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