XML 137 R64.htm IDEA: XBRL DOCUMENT v3.20.4
Schedule of Property, Plant and Equipment (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment $ 2,472,683 $ 2,749,463  
Rig Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 2,269,794 2,510,505  
Rental Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 27,359 34,437  
Other Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 27,318 38,604  
Vehicles [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 4,978 7,796  
Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 49,451 56,834  
Assets Under Construction [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 60,572 67,740  
Land [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 33,211 33,547  
Gross [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 6,563,206 6,670,979 $ 6,937,062
Gross [Member] | Rig Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 6,025,767 6,109,383 6,322,536
Gross [Member] | Rental Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 105,024 110,307 130,463
Gross [Member] | Other Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 181,004 185,319 191,290
Gross [Member] | Vehicles [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 35,350 38,506 45,456
Gross [Member] | Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 122,278 126,177 128,327
Gross [Member] | Assets Under Construction [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 60,572 67,740 84,561
Gross [Member] | Land [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment 33,211 33,547 34,429
Accumulated Depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (4,090,523) (3,921,516) (3,898,450)
Accumulated Depreciation [Member] | Rig Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (3,755,973) (3,598,878) (3,577,364)
Accumulated Depreciation [Member] | Rental Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (77,665) (75,870) (86,471)
Accumulated Depreciation [Member] | Other Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (153,686) (146,715) (139,095)
Accumulated Depreciation [Member] | Vehicles [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment (30,372) (30,710) (32,754)
Accumulated Depreciation [Member] | Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Property, plant and equipment $ (72,827) $ (69,343) $ (62,766)