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Summary of Reconciliation of Disaggregated Revenue by Primary Geographical Market (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)
Canada [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	305,613	459,377
Canada [Member] | Contract Drilling Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	247,678	336,483
Canada [Member] | Completion and Production Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	60,621	128,202
Canada [Member] | Inter- Segment Eliminations [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	(2,686)	(5,308)
United States [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	444,052	871,651
United States [Member] | Contract Drilling Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	427,436	852,293
United States [Member] | Completion and Production Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	16,630	19,627
United States [Member] | Inter- Segment Eliminations [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	(14)	(269)
International [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	186,088	210,292
International [Member] | Contract Drilling Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	$ 186,088	$ 210,292

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The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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