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Oil and Gas Properties - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Adjusted inflation for prices and costs subsequent to 2023 |  | 0.02 |
Reversal of impairment loss recognised in profit or loss |  | $ 341,326 |
Conventional CGU |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Reversal of impairment loss recognised in profit or loss |  | 0 |
Oil and gas assets |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Impairment | $ (2,600,000) | (2,200,000) | $ (180,000)
Discount rate applied to cash flow projections |  |  | 11.00%
Impairment |  | $ (2,247,162) | $ (180,000)
Oil and gas assets | Minimum |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Discount rate applied to cash flow projections | 8.00% | 10.00% |
Oil and gas assets | Maximum |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Discount rate applied to cash flow projections | 14.00% | 17.00% |
Oil and gas assets | Accumulated depreciation |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Impairment |  | $ (2,247,162) | $ (180,000)

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