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Critical accounting estimates and judgments - Summary of Allocated Goodwill to CGUs in Brazil (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
Dec. 31, 2016
 [1]
Sep. 30, 2016
Disclosure of information for cash-generating units [line items]          
Total assets allocated to CGUs tested $ 2,277,372 $ 1,645,089   $ 1,496,397  
Sugar, Ethanol and Energy | AVI          
Disclosure of information for cash-generating units [line items]          
Goodwill     $ 3,966   $ 5,012
Sugar, Ethanol and Energy | UMA          
Disclosure of information for cash-generating units [line items]          
Goodwill     2,107   2,622
Brazil | Cash-generating units          
Disclosure of information for cash-generating units [line items]          
Goodwill     6,073   7,634
Closing net book value of PPE items and other assets allocated to CGUs tested     618,818   719,558
Total assets allocated to CGUs tested     $ 624,891   $ 727,192
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.