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Income Tax Expense and Deferred Taxes - Summary of Unrecognized Tax Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect of total losses not recognized $ 167,030 $ 164,100
Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect of total losses not recognized 134,289  
Brazil [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect of total losses not recognized 5,791  
Greece [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect of total losses not recognized 26,950  
2018 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,880  
2018 [member] | Greece [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,880  
2019 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 28,934  
2019 [member] | Greece [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 28,934  
2020 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 26,420  
2020 [member] | Greece [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 26,420  
2021 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 16,058  
2021 [member] | Greece [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 16,058  
2022 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,638  
2022 [member] | Greece [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,638  
2025 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,858  
2025 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,858  
2026 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 14,839  
2026 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 14,839  
2027 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,703  
2027 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 10,703  
2028 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 25,959  
2028 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 25,959  
2029 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 23,444  
2029 [Member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 23,444  
2030 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,285  
2030 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 7,285  
2031 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 45,351  
2031 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 45,351  
2032 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 74,871  
2032 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 74,871  
2033 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 64,883  
2033 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 64,883  
2034 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 58,689  
2034 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 58,689  
2035 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 55,266  
2035 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 55,266  
2036 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 50,503  
2036 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 50,503  
2037 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 43,180  
2037 [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 43,180  
No Expiry [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 33,378  
No Expiry [member] | Brazil [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 33,378  
Tax losses carried forward [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 609,139  
Tax losses carried forward [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 482,831  
Tax losses carried forward [member] | Brazil [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 33,378  
Tax losses carried forward [member] | Greece [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 92,930  
Capital losses with no expiry [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses 65,812  
Capital losses with no expiry [member] | Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount of the tax losses $ 65,812