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Summary of Reconciliation of Disaggregated Revenue by Primary Geographical Market (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)
Canada [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	558,746	562,250
Canada [Member] | Contract Drilling Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	426,475	429,119
Canada [Member] | Completion and Production Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	138,030	139,113
Canada [Member] | Inter- Segment Eliminations [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	(5,759)	(5,982)
United States [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	791,312	568,573
United States [Member] | Contract Drilling Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	778,886	554,410
United States [Member] | Completion and Production Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	12,730	15,033
United States [Member] | Inter- Segment Eliminations [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	(304)	(870)
International [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	191,131	190,401
International [Member] | Contract Drilling Services [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenue	$ 191,131	$ 190,401

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The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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