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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 |  |  |

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