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Inventories - Movements in the Provision for Losses (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Classes of current inventories [abstract]      
Provisions for losses, beginning R$ 40,993 R$ 40,724 R$ 42,587
Reversals to net realizable value adjustment     (5,174)
Additions to net realizable value adjustment 5,974 2,245  
Additions of obsolescence and other losses     4,296
Reversals of obsolescence and other losses (5,184) (1,976)  
Oxiteno Andina [1]     (985)
Reclassification to assets held for sale (28,705)    
Provisions for losses, ending R$ 13,078 R$ 40,993 R$ 40,724
[1] Refers to the asset write-offs of Oxiteno Andina in 2019.