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Oil and Gas Properties - Sensitivity of the Estimated Recoverable Amount of Possible Changes (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
CAD ($)
Dec. 31, 2020
CAD ($)
cadPerBbl
cadPerMcf
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about property, plant and equipment [line items]      
Discount rate   1.00%  
Oil price | cadPerBbl   2.50  
Gas price | cadPerMcf   0.25  
Recoverable amount $ 2,974,796 $ 3,077,548  
Impairments 2,588,488 2,360,220 $ 187,822
Change in discount rate of 1% 220,750 140,600  
Change in oil price of $2.50/bbl 400,500 386,000  
Change in gas price of $0.25/mcf 49,000 57,400  
Impairment reversal   341,326  
Conventional CGU      
Disclosure of detailed information about property, plant and equipment [line items]      
Recoverable amount 37,444 54,265  
Impairments 41,000    
Change in discount rate of 1% 3,000 1,000  
Change in oil price of $2.50/bbl 3,500 3,000  
Change in gas price of $0.25/mcf 8,500 9,000  
Impairment reversal   0  
Peace River CGU      
Disclosure of detailed information about property, plant and equipment [line items]      
Recoverable amount 109,631 104,225  
Impairments 345,000    
Change in discount rate of 1% 9,500 1,000  
Change in oil price of $2.50/bbl 53,500 49,500  
Change in gas price of $0.25/mcf 3,000 3,000  
Impairment reversal   0  
Lloydminster CGU      
Disclosure of detailed information about property, plant and equipment [line items]      
Recoverable amount 227,967 212,979  
Impairments 470,000    
Change in discount rate of 1% 25,000 7,000  
Change in oil price of $2.50/bbl 69,500 57,500  
Change in gas price of $0.25/mcf 0 500  
Impairment reversal   0  
Duvernay CGU      
Disclosure of detailed information about property, plant and equipment [line items]      
Recoverable amount 61,197 70,491  
Impairments 5,000    
Change in discount rate of 1% 5,500 5,500  
Change in oil price of $2.50/bbl 9,500 12,000  
Change in gas price of $0.25/mcf 1,500 1,500  
Impairment reversal   0  
Viking CGU      
Disclosure of detailed information about property, plant and equipment [line items]      
Recoverable amount 962,134 1,026,026  
Impairments 915,000    
Change in discount rate of 1% 57,000 34,500  
Change in oil price of $2.50/bbl 123,000 106,500  
Change in gas price of $0.25/mcf 4,000 5,000  
Impairment reversal   116,000  
Eagle Ford CGU      
Disclosure of detailed information about property, plant and equipment [line items]      
Recoverable amount 1,576,423 1,609,562  
Impairments 812,488    
Change in discount rate of 1% 120,750 91,600  
Change in oil price of $2.50/bbl 141,500 157,500  
Change in gas price of $0.25/mcf $ 32,000 38,400  
Impairment reversal   $ 225,326