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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement In Other Provisions [Roll Forward]      
Other provisions $ 4,843 $ 3,889 $ 2,313
Additions 4,750 3,504  
Used during year (3,779) (2,188)  
Exchange differences (17) 260  
Labor, legal and other claims      
Movement In Other Provisions [Roll Forward]      
Other provisions 4,838 3,857 2,293
Additions 4,750 3,447  
Used during year (3,754) (2,174)  
Exchange differences (15) 291  
Others      
Movement In Other Provisions [Roll Forward]      
Other provisions 5 32 $ 20
Additions 0 57  
Used during year (25) (14)  
Exchange differences $ (2) $ (31)