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Summary of Operating Segments (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [Line Items]      
Revenue $ 1,541,189 $ 1,321,224  
Operating loss (323,596) (232,057)  
Depreciation and amortization 365,660 377,746  
Impairment of goodwill 207,544    
Impairment of property, plant and equipment   15,313  
Total assets 3,636,043 3,892,931  
Goodwill   205,167 $ 207,399
All Other Segments [Member]      
Disclosure of operating segments [Line Items]      
Revenue 1,541,189 1,321,224  
Operating loss (198,073) (88,078)  
Depreciation and amortization 365,660 377,746  
Impairment of goodwill 207,544    
Impairment of property, plant and equipment   15,313  
Total assets 3,636,043 3,892,931  
Goodwill   205,167  
Capital expenditures 126,143 98,002  
Contract Drilling Services [Member]      
Disclosure of operating segments [Line Items]      
Revenue 1,396,492 1,173,930  
Contract Drilling Services [Member] | All Other Segments [Member]      
Disclosure of operating segments [Line Items]      
Revenue 1,396,492 1,173,930  
Operating loss (129,965) (6,930)  
Depreciation and amortization 334,555 334,587  
Impairment of goodwill 207,544    
Impairment of property, plant and equipment   15,313  
Total assets 3,301,457 3,491,393  
Goodwill   205,167  
Capital expenditures 108,610 69,076  
Completion and Production Services [Member]      
Disclosure of operating segments [Line Items]      
Revenue 150,760 154,146  
Completion and Production Services [Member] | All Other Segments [Member]      
Disclosure of operating segments [Line Items]      
Revenue 150,760 154,146  
Operating loss (8,998) (17,750)  
Depreciation and amortization 23,879 29,638  
Total assets 170,113 209,353  
Capital expenditures 5,004 4,509  
Corporate and Other [Member] | All Other Segments [Member]      
Disclosure of operating segments [Line Items]      
Operating loss (59,110) (63,398)  
Depreciation and amortization 7,226 13,521  
Total assets 164,473 192,185  
Capital expenditures 12,529 24,417  
Inter- Segment Eliminations [Member]      
Disclosure of operating segments [Line Items]      
Revenue (6,063) (6,852)  
Inter- Segment Eliminations [Member] | All Other Segments [Member]      
Disclosure of operating segments [Line Items]      
Revenue $ (6,063) $ (6,852)