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Segmented Financial Information - Information By Reportable Segment (Details) - CAD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Revenue [abstract]      
Petroleum and natural gas sales   $ 975,477 $ 1,805,919
Royalties   (163,735) (320,241)
Revenue, net of royalties   811,742 1,485,678
Expenses      
Operating   331,345 397,716
Transportation   28,437 43,942
Blending and other   48,381 68,795
General and administrative   34,268 45,469
Exploration and evaluation   14,011 11,764
Depletion and depreciation   486,380 731,686
Impairment $ 2,588,488 2,360,220 187,822
Share-based compensation   7,216 15,894
Financing and interest   125,441 125,865
Financial derivatives (gain) loss   (29,336) 7,197
Foreign exchange loss (gain)   (8,688) 61,787
Gain on dispositions   (901) (2,238)
Other income   5,304 7,526
Total expenses   3,411,099 1,564,599
Net loss before income taxes   (2,599,357) (78,921)
Income tax (recovery) expense      
Current income tax expense   574 2,093
Deferred income tax (recovery) expense   (160,967) (68,555)
Income tax recovery   (160,393) (66,462)
Net loss   (2,438,964) (12,459)
Operating segments | Canada      
Revenue [abstract]      
Petroleum and natural gas sales   571,741 1,077,724
Royalties   (46,064) (107,467)
Revenue, net of royalties   525,677 970,257
Expenses      
Operating   247,050 298,303
Transportation   28,437 43,942
Blending and other   48,381 68,795
General and administrative   0 0
Exploration and evaluation   14,011 11,764
Depletion and depreciation   309,420 463,501
Impairment   1,737,000 187,822
Share-based compensation   0 0
Financing and interest   0 0
Financial derivatives (gain) loss   0 0
Foreign exchange loss (gain)   0 0
Gain on dispositions   (901) (2,238)
Other income   2,128 0
Total expenses   2,381,270 1,071,889
Net loss before income taxes   (1,855,593) (101,632)
Income tax (recovery) expense      
Current income tax expense   469 101
Deferred income tax (recovery) expense   (77,201) (32,942)
Income tax recovery   (76,732) (32,841)
Net loss   (1,778,861) (68,791)
Total oil and natural gas capital expenditures   174,770 376,543
Operating segments | U.S.      
Revenue [abstract]      
Petroleum and natural gas sales   403,736 728,195
Royalties   (117,671) (212,774)
Revenue, net of royalties   286,065 515,421
Expenses      
Operating   84,295 99,413
Transportation   0 0
Blending and other   0 0
General and administrative   0 0
Exploration and evaluation   0 0
Depletion and depreciation   169,439 261,766
Impairment   623,220 0
Share-based compensation   0 0
Financing and interest   0 0
Financial derivatives (gain) loss   0 0
Foreign exchange loss (gain)   0 0
Gain on dispositions   0 0
Other income   0 0
Total expenses   876,954 361,179
Net loss before income taxes   (590,889) 154,242
Income tax (recovery) expense      
Current income tax expense   105 1,992
Deferred income tax (recovery) expense   (57,199) 10,055
Income tax recovery   (57,094) 12,047
Net loss   (533,795) 142,195
Total oil and natural gas capital expenditures   105,388 177,928
Operating segments | Corporate      
Revenue [abstract]      
Petroleum and natural gas sales   0 0
Royalties   0 0
Revenue, net of royalties   0 0
Expenses      
Operating   0 0
Transportation   0 0
Blending and other   0 0
General and administrative   34,268 45,469
Exploration and evaluation   0 0
Depletion and depreciation   7,521 6,419
Impairment   0 0
Share-based compensation   9,469 15,894
Financing and interest   125,441 125,865
Financial derivatives (gain) loss   (29,336) 7,197
Foreign exchange loss (gain)   8,688 61,787
Gain on dispositions   0 0
Other income   (3,176) 7,526
Total expenses   152,875 131,531
Net loss before income taxes   (152,875) (131,531)
Income tax (recovery) expense      
Current income tax expense   0 0
Deferred income tax (recovery) expense   (26,567) (45,668)
Income tax recovery   (26,567) (45,668)
Net loss   (126,308) (85,863)
Total oil and natural gas capital expenditures   0 0
Operating segments | Consolidated      
Revenue [abstract]      
Petroleum and natural gas sales   975,477 1,805,919
Royalties   (163,735) (320,241)
Revenue, net of royalties   811,742 1,485,678
Expenses      
Operating   331,345 397,716
Transportation   28,437 43,942
Blending and other   48,381 68,795
General and administrative   34,268 45,469
Exploration and evaluation   14,011 11,764
Depletion and depreciation   486,380 731,686
Impairment   2,360,220 187,822
Share-based compensation   9,469 15,894
Financing and interest   125,441 125,865
Financial derivatives (gain) loss   (29,336) 7,197
Foreign exchange loss (gain)   (8,688) 61,787
Gain on dispositions   (901) (2,238)
Other income   5,304 7,526
Total expenses   3,411,099 1,564,599
Net loss before income taxes   (2,599,357) (78,921)
Income tax (recovery) expense      
Current income tax expense   574 2,093
Deferred income tax (recovery) expense   (160,967) (68,555)
Income tax recovery   (160,393) (66,462)
Net loss   (2,438,964) (12,459)
Total oil and natural gas capital expenditures   $ 280,158 $ 554,471