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Exploration and Evaluation Assets - Impairment Reversal Booked (Details) - CAD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items] |  |
Reversal of impairment loss recognised in profit or loss |  | $ 341,326
Viking CGU |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Reversal of impairment loss recognised in profit or loss |  | 116,000
Eagle Ford CGU |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Reversal of impairment loss recognised in profit or loss |  | 225,326
Exploration and evaluation assets |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment loss on financial assets | $ (127,861) |
Exploration and evaluation assets | Viking CGU |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Reversal of impairment loss recognised in profit or loss |  | 2,000
Impairment loss on financial assets | (13,000) |
Exploration and evaluation assets | Eagle Ford CGU |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Reversal of impairment loss recognised in profit or loss |  | 12,803
Impairment loss on financial assets | $ (48,861) |
Exploration and evaluation assets | Viking And Eagle Ford Cash Generating Units |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Reversal of impairment loss recognised in profit or loss |  | $ 14,803

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