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Summary of Reconciliation of Disaggregated Revenue by Type of Service Provided (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue $ 935,753 $ 1,541,320
Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 861,202 1,399,068
Completion and Production Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 77,251 147,829
Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue (2,700) (5,577)
Day Rate Or Hourly Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 856,630 1,480,038
Day Rate Or Hourly Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 779,772 1,333,114
Day Rate Or Hourly Services [Member] | Completion and Production Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 77,251 147,829
Day Rate Or Hourly Services [Member] | Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue (393) (905)
Shortfall Payments Or Idle But Contracted [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 51,028 9,789
Shortfall Payments Or Idle But Contracted [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 51,028 9,789
Turnkey Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 14,134 3,754
Turnkey Drilling Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 14,134 3,754
Directional Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 9,637 41,876
Directional Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 9,637 41,876
Other [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 4,324 5,863
Other [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 6,631 10,535
Other [Member] | Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue $ (2,307) $ (4,672)