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Summary of Reconciliation of Disaggregated Revenue by Type of Service Provided (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue $ 1,541,189 $ 1,321,224
Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 1,396,492 1,173,930
Completion and Production Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 150,760 154,146
Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue (6,063) (6,852)
Day Rate Or Hourly Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 1,452,326 1,228,550
Day Rate Or Hourly Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 1,302,575 1,076,018
Day Rate Or Hourly Services [Member] | Completion and Production Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 150,760 154,146
Day Rate Or Hourly Services [Member] | Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue (1,009) (1,614)
Shortfall Payments Or Idle But Contracted [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 12,520 39,468
Shortfall Payments Or Idle But Contracted [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 12,520 39,468
Turnkey Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 37,811 12,306
Turnkey Drilling Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 37,811 12,306
Directional Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 31,943 34,481
Directional Services [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 31,943 34,481
Other [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 6,589 6,419
Other [Member] | Contract Drilling Services [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue 11,643 11,657
Other [Member] | Inter- Segment Eliminations [Member]    
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]    
Revenue $ (5,054) $ (5,238)