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Schedule of Property, Plant and Equipment (Detail) - CAD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | $ 3,173,824 | $ 3,641,889 |
Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 2,823,782 | 3,210,933 |
Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 60,179 | 79,398 |
Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 66,560 | 85,731 |
Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 16,280 | 22,030 |
Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 71,102 | 82,335 |
Assets Under Construction [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 102,035 | 126,430 |
Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 33,886 | 35,032 |
Gross [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 6,733,634 | 7,011,178 | $ 6,949,846
Gross [Member] | Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 6,034,166 | 6,266,991 | 6,069,179
Gross [Member] | Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 148,011 | 159,144 | 171,220
Gross [Member] | Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 244,950 | 247,073 | 240,192
Gross [Member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 43,201 | 45,147 | 43,552
Gross [Member] | Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 127,385 | 131,361 | 131,164
Gross [Member] | Assets Under Construction [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 102,035 | 126,430 | 258,952
Gross [Member] | Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 33,886 | 35,032 | 35,587
Accumulated Depreciation [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 3,559,810 | 3,369,289 | 3,066,514
Accumulated Depreciation [Member] | Rig Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 3,210,384 | 3,056,058 | 2,789,991
Accumulated Depreciation [Member] | Rental Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 87,832 | 79,746 | 74,220
Accumulated Depreciation [Member] | Other Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 178,390 | 161,342 | 142,846
Accumulated Depreciation [Member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | 26,921 | 23,117 | 18,712
Accumulated Depreciation [Member] | Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Property, plant and equipment | $ 56,283 | $ 49,026 | $ 40,745

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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 2016-01-13 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_a&doctype=Standard -URIDate 2016-03-31 + Details
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