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Summary of Reconciliation of Disaggregated Revenue by Type of Service Provided (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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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)

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