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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