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Financial Instrument Risk Exposure and Risk Management - Disclosure Of Detailed Information About Financial Assets And Liabilities Denominated In Currencies Other Than The US Dollar (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial liabilities [line items]    
Financial assets $ 47,374 $ 46,121
Financial liabilities 35,973 24,010
Brazilian Reals [Member]    
Disclosure of financial liabilities [line items]    
Financial assets 28,653 19,810
Financial liabilities 28,986 20,984
Canadian dollars [Member]    
Disclosure of financial liabilities [line items]    
Financial assets 18,721 26,311
Financial liabilities $ 6,987 $ 3,026