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Inventories - Movements in the Provision for Losses (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventories details 1 [abstract]      
Provisions for losses, beginning R$ 40,724 R$ 42,587 R$ 37,099
Additions to net realizable value adjustment 2,245   600
Additions of obsolescence and other losses   4,296 3,903
Reversals of obsolescence and other losses (1,976) (5,174)  
Oxiteno Andina   (985) [1] 985 [2]
Provisions for losses, ending R$ 40,993 R$ 40,724 R$ 42,587
[1] Refers to the asset write-offs of Oxiteno Andina in 2019 (see Note 3.b.6).
[2] Refers to impairment for subsidiary Oxiteno Andina.