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Schedule of Property, Plant and Equipment (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment $ 2,258,391 $ 2,472,683  
Rig Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 2,074,185 2,269,794  
Rental Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 20,597 27,359  
Other Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 17,088 27,318  
Vehicles [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 3,204 4,978  
Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 44,009 49,451  
Assets Under Construction [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 67,884 60,572  
Land [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 31,424 33,211  
Gross [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 6,503,721 6,563,206 $ 6,670,979
Gross [Member] | Rig Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 5,968,316 6,025,767 6,109,383
Gross [Member] | Rental Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 103,181 105,024 110,307
Gross [Member] | Other Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 178,717 181,004 185,319
Gross [Member] | Vehicles [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 34,680 35,350 38,506
Gross [Member] | Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 119,519 122,278 126,177
Gross [Member] | Assets Under Construction [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 67,884 60,572 67,740
Gross [Member] | Land [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 31,424 33,211 33,547
Accumulated Depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (4,245,330) (4,090,523) (3,921,516)
Accumulated Depreciation [Member] | Rig Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (3,894,131) (3,755,973) (3,598,878)
Accumulated Depreciation [Member] | Rental Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (82,584) (77,665) (75,870)
Accumulated Depreciation [Member] | Other Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (161,629) (153,686) (146,715)
Accumulated Depreciation [Member] | Vehicles [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (31,476) (30,372) (30,710)
Accumulated Depreciation [Member] | Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment $ (75,510) $ (72,827) $ (69,343)