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Property, Plant and Equipment - Additional Information (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Disclosure of detailed information about property, plant and equipment [Line Items]      
Reversal of impairment charge $ 5,810    
Goodwill impairment charges     $ 207,544
Increase in depreciation amount 3,000    
Mexico Based Drilling Rigs And Ancillary Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Proceeds from disposal   $ 48  
Gains on disposals of assets   24  
Reversal of impairment charge   4  
Snubbing Units and Related Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Proceeds from disposal   8  
Gains on disposals of assets   $ 3  
Drilling and Ancillary Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Gains on disposals of assets $ 20,000