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Cash and Cash Equivalents and Financial Investments - Cash and cash equivalents (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents and financial investments details [abstract]        
Cash and bank deposits In local currency R$ 182,237 R$ 117,231    
In foreign currency 102,755 88,251    
Fixed-income securities 1,780,939 3,722,308    
Fixed-income securities 49,448 11,161    
Total cash and cash equivalents R$ 2,115,379 R$ 3,938,951 R$ 5,002,004 R$ 4,274,158