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Inventories - Movements in the Provision for Losses (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories details 1 [abstract]      
Provisions for losses, beginning R$ 42,587 R$ 37,099 R$ 47,271
Additions to net realizable value adjustment (5,174) 600 (6,713)
Additions of obsolescence and other losses   3,903  
Reversals of obsolescence and other losses 4,296   (3,459)
Oxiteno Andina (985) 985  
Provisions for losses, ending R$ 40,724 R$ 42,587 R$ 37,099