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Summary of Reconciliation of Disaggregated Revenue by Type of Service Provided (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue $ 1,541,320 $ 1,541,189
Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 1,399,068 1,396,492
Completion and Production Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 147,829 150,760
Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue (5,577) (6,063)
Day Rate Or Hourly Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 1,480,038 1,452,326
Day Rate Or Hourly Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 1,333,114 1,302,575
Day Rate Or Hourly Services [Member] | Completion and Production Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 147,829 150,760
Day Rate Or Hourly Services [Member] | Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue (905) (1,009)
Shortfall Payments Or Idle But Contracted [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 9,789 12,520
Shortfall Payments Or Idle But Contracted [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 9,789 12,520
Turnkey Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 3,754 37,811
Turnkey Drilling Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 3,754 37,811
Directional Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 41,876 31,943
Directional Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 41,876 31,943
Other [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 5,863 6,589
Other [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 10,535 11,643
Other [Member] | Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue $ (4,672) $ (5,054)