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Bank Indebtedness - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about financial instruments [Line Items]        
Description of interest rate Advances under the $40.0 million facility are available at the bank’s prime lending rate, U.S. base rate, U.S. LIBOR rate plus 80% of applicable margin, or Banker’s Acceptance plus 80% of applicable margin, or in combination, and under the US$15.0 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 $ 27,800,000   $ 20,800,000  
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   $ 2,100,000   $ 13,300,000