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Financial risk management - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended 13 Months Ended
Dec. 01, 2020
Aug. 31, 2020
Mar. 30, 2020
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
May 31, 2019
Disclosure of risk management [line items]                    
Increase/decrease in the U.S. dollar exchange rate against all currencies except Canadian dollar, Australian dollar, Euro, Turkish lira, Chinese renminbi, Swedish krona, Romanian lei, Great British pound and Brazilian real             1.00%      
Decrease/increase in profit (loss) before taxes due to 1% increase/decrease in the U.S. dollar exchange rate against all currencies except Canadian dollar, Australian dollar, Euro, Turkish lira, Chinese renminbi, Swedish krona, Romanian lei, Great British pound and Brazilian real             $ 296,000 $ 805,000    
Proceeds from borrowings, classified as financing activities             $ 150,000,000 494,000,000    
Percent increase in variable interest rate             1.00%      
Increase (decrease) in net earnings on an annualized basis             $ 2,873,000      
Maximum exposure to credit risk       $ 583,455,000     583,455,000      
Issuance of common shares for cash, net of issuance costs             95,992,000 40,066,000    
Repayments of borrowings, classified as financing activities             132,714,000 600,000,000    
ATM Program                    
Disclosure of risk management [line items]                    
Issuance of common shares for cash, net of issuance costs             $ 121,540,000   $ 121,540,000  
Senior notes                    
Disclosure of risk management [line items]                    
Debt fixed interest rate       9.50%     9.50%      
Notional amount       $ 300,000,000     $ 300,000,000      
Repayments of borrowings, classified as financing activities $ 7,473,000 $ 58,574,000                
Revolving credit facility                    
Disclosure of risk management [line items]                    
Proceeds from borrowings, classified as financing activities     $ 150,000,000     $ 150,000,000 150,000,000      
Notional amount       150,000,000     150,000,000     $ 250,000,000
Term loan                    
Disclosure of risk management [line items]                    
Proceeds from borrowings, classified as financing activities               $ 200,000,000    
Notional amount       133,333,000 $ 200,000,000   133,333,000     $ 200,000,000
Repayments of borrowings, classified as financing activities       $ 33,333,000 $ 33,333,000   $ 66,667,000