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Provisions for other liabilities - Summary of Changes in Provisions for Other Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance $ 4,843 $ 3,889
Additions 1,147 4,750
Used during year (1,379) (3,779)
Exchange differences (986) (17)
Other provisions, ending balance 3,625 4,843
Labor, legal and other claims    
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance 4,838 3,857
Additions 1,147 4,750
Used during year (1,379) (3,754)
Exchange differences (986) (15)
Other provisions, ending balance 3,620 4,838
Others    
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance 5 32
Additions 0 0
Used during year 0 (25)
Exchange differences 0 (2)
Other provisions, ending balance $ 5 $ 5