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Inventories - Movements in the Provision for Losses (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Inventories details 1 [abstract]      
Provisions for losses, beginning R$ 37,099 R$ 47,271 R$ 33,992
Additions to net realizable value adjustment 600 (6,713) 12,393
Additions of obsolescence and other losses 3,903   886
Reversals of obsolescence and other losses   (3,459)  
Oxiteno Andina 985    
Provisions for losses, ending R$ 42,587 R$ 37,099 R$ 47,271