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Exploration and Evaluation Assets - Impairment Booked for Cash Generating Untis (Details) - Exploration and evaluation assets - CAD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 | Dec. 31, 2019
Exploration For And Evaluation Of Mineral Resources [Abstract] |  |
Impairment loss on financial assets | $ 127,861 |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss on financial assets | 127,861 |
Conventional CGU |  |
Exploration For And Evaluation Of Mineral Resources [Abstract] |  |
Impairment loss on financial assets | 4,000 |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss on financial assets | 4,000 |
Peace River CGU |  |
Exploration For And Evaluation Of Mineral Resources [Abstract] |  |
Impairment loss on financial assets | 20,000 | $ 7,800
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss on financial assets | 20,000 | $ 7,800
Lloydminster CGU |  |
Exploration For And Evaluation Of Mineral Resources [Abstract] |  |
Impairment loss on financial assets | 42,000 |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss on financial assets | 42,000 |
Viking CGU |  |
Exploration For And Evaluation Of Mineral Resources [Abstract] |  |
Impairment loss on financial assets | 13,000 |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss on financial assets | 13,000 |
Eagle Ford CGU |  |
Exploration For And Evaluation Of Mineral Resources [Abstract] |  |
Impairment loss on financial assets | 48,861 |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss on financial assets | $ 48,861 |

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- Definition The amount of impairment loss on financial assets. [Refer: Financial assets; Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 20 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_20_e&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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