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Exploration and Evaluation Assets - Impairment Reversal Booked (Details) - CAD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss (reversal of impairment loss) recognised in profit or loss   $ (1,126,415) $ (416,000)  
Reversal of impairment loss recognised in profit or loss   1,100,000   $ 341,326
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       341,300
Viking CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss (reversal of impairment loss) recognised in profit or loss   (356,000) 0  
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]        
Impairment loss (reversal of impairment loss) recognised in profit or loss   $ (442,415) $ 0  
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 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
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)