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Schedule of Property, Plant and Equipment (Detail) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | $ 3,038,612 | $ 3,173,824 |
Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 2,745,172 | 2,823,782 |
Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 43,992 | 60,179 |
Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 52,195 | 66,560 |
Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 12,702 | 16,280 |
Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 65,561 | 71,102 |
Assets Under Construction [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 84,561 | 102,035 |
Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 34,429 | 33,886 |
Gross [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 6,937,062 | 6,733,634 | $ 7,011,178
Gross [Member] | Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 6,322,536 | 6,034,166 | 6,266,991
Gross [Member] | Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 130,463 | 148,011 | 159,144
Gross [Member] | Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 191,290 | 244,950 | 247,073
Gross [Member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 45,456 | 43,201 | 45,147
Gross [Member] | Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 128,327 | 127,385 | 131,361
Gross [Member] | Assets Under Construction [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 84,561 | 102,035 | 126,430
Gross [Member] | Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 34,429 | 33,886 | 35,032
Accumulated Depreciation [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 3,898,450 | 3,559,810 | 3,369,289
Accumulated Depreciation [Member] | Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 3,577,364 | 3,210,384 | 3,056,058
Accumulated Depreciation [Member] | Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 86,471 | 87,832 | 79,746
Accumulated Depreciation [Member] | Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 139,095 | 178,390 | 161,342
Accumulated Depreciation [Member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 32,754 | 26,921 | 23,117
Accumulated Depreciation [Member] | Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | $ 62,766 | $ 56,283 | $ 49,026

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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 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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