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Inventories - Movements in the Provision for Losses (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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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.

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- Definition The amount of impairment loss or reversal of impairment loss recognised in profit or loss for loans and advances. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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