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Income taxes - Summary of Unrecognized Tax Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect of total losses not recognized $ 169,498 $ 160,052
Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect of total losses not recognized 140,087  
Brazil    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect of total losses not recognized 5,797  
Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect of total losses not recognized 23,614  
2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 24,745  
2020 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 24,745  
2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,253  
2021 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,253  
2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,856  
2022 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,856  
2023    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 17,347  
2023 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 17,347  
2024    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 38,194  
2024 | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 38,194  
2025    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,894  
2025 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,894  
2026    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 14,966  
2026 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 14,966  
2027    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,638  
2027 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,638  
2028    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 25,971  
2028 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 25,971  
2029    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 23,444  
2029 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 23,444  
2030    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,282  
2030 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,282  
2031    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 45,351  
2031 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 45,351  
2032    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 74,855  
2032 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 74,855  
2033    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 64,883  
2033 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 64,883  
2034    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 58,689  
2034 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 58,689  
2035    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 55,266  
2035 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 55,266  
2036    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 50,503  
2036 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 50,503  
2037    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 38,978  
2037 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 38,978  
2038    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,999  
2038 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,999  
2039    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 510  
2039 | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 510  
No Expiry    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 31,128  
No Expiry | Brazil    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 31,128  
Tax Losses Carried Forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 616,752  
Tax Losses Carried Forward | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 487,229  
Tax Losses Carried Forward | Brazil    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 31,128  
Tax Losses Carried Forward | Greece    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 98,395  
Capital losses with no expiry    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 63,483  
Capital losses with no expiry | Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses $ 63,483