XML 164 R91.htm IDEA: XBRL DOCUMENT v3.20.4
Bank Indebtedness - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about financial instruments [Line Items]        
Description of interest rate Advances under the $40 million facility are available at the bank’s prime lending rate, U.S. base rate, U.S. LIBOR rate plus applicable margin, or applicable margin for Banker’s Acceptances, or in combination, and under the US$15 million facility at the bank’s prime lending rate      
40.0 Million Secured Operating Facilities [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Line of credit borrowing capacity $ 40,000,000   $ 40,000,000  
Line of credit outstanding 0   0  
Letters of credit outstanding $ 7,000,000   $ 26,000,000  
15.0 Million Secured Operating Facilities [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Line of credit borrowing capacity   $ 15,000,000   $ 15,000,000
Line of credit outstanding   0   0
30.0 Million Operating Facilities [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Line of credit borrowing capacity   30,000,000   30,000,000
Line of credit outstanding   0   0
Letters of credit outstanding   $ 2,000,000   $ 2,000,000