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Property, Plant and Equipment - Additional Information (Detail) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($)
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Reversal of impairment charge | $ 5,810 |  |
Goodwill impairment charges |  |  | $ 207,544
Increase in depreciation amount | 3,000 |  |
Mexico Based Drilling Rigs And Ancillary Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Proceeds from disposal |  | $ 48 |
Gains on disposals of assets |  | 24 |
Reversal of impairment charge |  | 4 |
Snubbing Units and Related Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Proceeds from disposal |  | 8 |
Gains on disposals of assets |  | $ 3 |
Drilling and Ancillary Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Gains on disposals of assets | $ 20,000 |  |

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- Definition The gain on the disposal of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The cash inflow from disposal of oil and gas assets. [Refer: Oil and gas assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_16&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of reversal of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Reversal of impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_vi&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_a&doctype=Standard -URIDate 2019-03-27 + Details
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