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Investment property - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period $ 40,725 $ 42,342
Net (loss) / gain from fair value adjustment (Note 8) (325) 13,409
Reclassification to property, plant and equipment (i) (4,816) (3,313)
Exchange difference (1,289) (11,713)
Investment property, end of period 34,295 40,725
Cost    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 40,725  
Investment property, end of period 34,295 40,725
Fair value    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 40,725  
Investment property, end of period $ 34,295 $ 40,725