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Inventories - Breakdown of Provision for Losses Related to Inventories (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Classes of current inventories [abstract]        
Net realizable value adjustment R$ 21,402 R$ 19,817    
Obsolescence and other losses 21,185 17,282    
Provision for losses related to inventories R$ 42,587 R$ 37,099 R$ 47,271 R$ 33,992