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Schedule of Property, Plant and Equipment (Detail) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | $ 2,749,463 | $ 3,038,612 |
Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 2,510,505 | 2,745,172 |
Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 34,437 | 43,992 |
Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 38,604 | 52,195 |
Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 7,796 | 12,702 |
Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 56,834 | 65,561 |
Assets Under Construction [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 67,740 | 84,561 |
Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 33,547 | 34,429 |
Gross [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 6,670,979 | 6,937,062 | $ 6,733,634
Gross [Member] | Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 6,109,383 | 6,322,536 | 6,034,166
Gross [Member] | Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 110,307 | 130,463 | 148,011
Gross [Member] | Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 185,319 | 191,290 | 244,950
Gross [Member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 38,506 | 45,456 | 43,201
Gross [Member] | Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 126,177 | 128,327 | 127,385
Gross [Member] | Assets Under Construction [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 67,740 | 84,561 | 102,035
Gross [Member] | Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 33,547 | 34,429 | 33,886
Accumulated Depreciation [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 3,921,516 | 3,898,450 | 3,559,810
Accumulated Depreciation [Member] | Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 3,598,878 | 3,577,364 | 3,210,384
Accumulated Depreciation [Member] | Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 75,870 | 86,471 | 87,832
Accumulated Depreciation [Member] | Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 146,715 | 139,095 | 178,390
Accumulated Depreciation [Member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 30,710 | 32,754 | 26,921
Accumulated Depreciation [Member] | Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | $ 69,343 | $ 62,766 | $ 56,283

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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