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Summary of Operating Segments (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [Line Items]    
Revenue $ 1,541,320 $ 1,541,189
Operating earnings (loss) (8,339) (323,596)
Depreciation and amortization 333,616 377,044
Impairment of goodwill   207,544
Total assets 3,269,840 3,636,043
All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Revenue 1,541,320 1,541,189
Operating earnings (loss) 94,577 (198,073)
Depreciation and amortization 333,616 377,044
Loss (gain) on asset disposals (50,741) (11,384)
Impairment of goodwill   207,544
Loss on asset decommissioning 20,263  
Reversal of impairment of property, plant and equipment (5,810)  
Total assets 3,269,840 3,636,043
Capital expenditures 160,694 126,143
Contract Drilling Services [Member]    
Disclosure of operating segments [Line Items]    
Revenue 1,399,068 1,396,492
Contract Drilling Services [Member] | All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Revenue 1,399,068 1,396,492
Operating earnings (loss) 160,997 (129,965)
Depreciation and amortization 300,882 341,712
Loss (gain) on asset disposals (46,849) (7,157)
Impairment of goodwill   207,544
Loss on asset decommissioning 20,263  
Reversal of impairment of property, plant and equipment (5,810)  
Total assets 2,963,260 3,301,457
Capital expenditures 154,066 108,610
Completion and Production Services [Member]    
Disclosure of operating segments [Line Items]    
Revenue 147,829 150,760
Completion and Production Services [Member] | All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Revenue 147,829 150,760
Operating earnings (loss) 10,041 (8,998)
Depreciation and amortization 17,881 22,801
Loss (gain) on asset disposals (3,767) 1,078
Total assets 152,611 170,113
Capital expenditures 5,448 5,004
Corporate and Other [Member] | All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Operating earnings (loss) (76,461) (59,110)
Depreciation and amortization 14,853 12,531
Loss (gain) on asset disposals (125) (5,305)
Total assets 153,969 164,473
Capital expenditures 1,180 12,529
Inter- Segment Eliminations [Member]    
Disclosure of operating segments [Line Items]    
Revenue (5,577) (6,063)
Inter- Segment Eliminations [Member] | All Other Segments [Member]    
Disclosure of operating segments [Line Items]    
Revenue $ (5,577) $ (6,063)