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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)

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