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Summary of Operating Segments (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [Line Items]    
Revenue $ 935,753 $ 1,541,320
Operating earnings (loss) (109,184) (8,339)
Depreciation and amortization 316,322 333,616
Total assets 2,898,878 3,269,840
All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Revenue 935,753 1,541,320
Operating earnings (loss) (40,988) 94,577
Depreciation and amortization 316,322 333,616
Loss (gain) on asset disposals (11,931) (50,741)
Total assets 2,898,878 3,269,840
Capital expenditures 61,592 160,694
Loss on asset decommissioning   20,263
Reversal of impairment of property, plant and equipment   (5,810)
Contract Drilling Services [Member]    
Disclosure of operating segments [Line Items]    
Revenue 861,202 1,399,068
Contract Drilling Services [Member] | All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Revenue 861,202 1,399,068
Operating earnings (loss) 22,207 160,997
Depreciation and amortization 288,389 300,882
Loss (gain) on asset disposals (10,171) (46,849)
Total assets 2,571,397 2,963,260
Capital expenditures 57,741 154,066
Loss on asset decommissioning   20,263
Reversal of impairment of property, plant and equipment   (5,810)
Completion and Production Services [Member]    
Disclosure of operating segments [Line Items]    
Revenue 77,251 147,829
Completion and Production Services [Member] | All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Revenue 77,251 147,829
Operating earnings (loss) (3,671) 10,041
Depreciation and amortization 16,375 17,881
Loss (gain) on asset disposals (1,447) (3,767)
Total assets 132,771 152,611
Capital expenditures 3,362 5,448
Corporate and Other [Member] | All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Operating earnings (loss) (59,524) (76,461)
Depreciation and amortization 11,558 14,853
Loss (gain) on asset disposals (313) (125)
Total assets 194,710 153,969
Capital expenditures 489 1,180
Inter- Segment Eliminations [Member]    
Disclosure of operating segments [Line Items]    
Revenue (2,700) (5,577)
Inter- Segment Eliminations [Member] | All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Revenue $ (2,700) $ (5,577)