XML 139 R66.htm IDEA: XBRL DOCUMENT v3.20.4
Property, Plant and Equipment - Additional Information (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about property, plant and equipment [Line Items]      
Gains on disposals of assets $ 12,000 $ 51,000  
Reversal of impairment charge   5,810  
Mexico Based Drilling Rigs And Ancillary Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Gains on disposals of assets     $ 24
Proceeds from disposal     48
Reversal of impairment charge     $ 4
Snubbing Units and Related Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Gains on disposals of assets   3,000  
Proceeds from disposal   8,000  
Drilling and Ancillary Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Loss on asset decommissioning   $ 20,000