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Schedule of Property, Plant and Equipment (Detail) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | $ 2,472,683 | $ 2,749,463 |
Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 2,269,794 | 2,510,505 |
Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 27,359 | 34,437 |
Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 27,318 | 38,604 |
Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 4,978 | 7,796 |
Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 49,451 | 56,834 |
Assets Under Construction [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 60,572 | 67,740 |
Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 33,211 | 33,547 |
Gross [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 6,563,206 | 6,670,979 | $ 6,937,062
Gross [Member] | Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 6,025,767 | 6,109,383 | 6,322,536
Gross [Member] | Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 105,024 | 110,307 | 130,463
Gross [Member] | Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 181,004 | 185,319 | 191,290
Gross [Member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 35,350 | 38,506 | 45,456
Gross [Member] | Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 122,278 | 126,177 | 128,327
Gross [Member] | Assets Under Construction [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 60,572 | 67,740 | 84,561
Gross [Member] | Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 33,211 | 33,547 | 34,429
Accumulated Depreciation [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | (4,090,523) | (3,921,516) | (3,898,450)
Accumulated Depreciation [Member] | Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | (3,755,973) | (3,598,878) | (3,577,364)
Accumulated Depreciation [Member] | Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | (77,665) | (75,870) | (86,471)
Accumulated Depreciation [Member] | Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | (153,686) | (146,715) | (139,095)
Accumulated Depreciation [Member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | (30,372) | (30,710) | (32,754)
Accumulated Depreciation [Member] | Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | $ (72,827) | $ (69,343) | $ (62,766)

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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 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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