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Equity - Dividends and Allocation of Net Income (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allocation of net income [abstract]      
Profit (loss), attributable to owners of parent R$ 893,383 R$ 373,526 R$ 1,150,421
Legal reserves 44,669    
Adjusted Net Income Basis for Dividends 848,714    
Minimum mandatory dividends 424,357    
Additional Dividends to Minimum Mandatory Dividends 55,391    
Allocation of Net Income to Investments Statutory Reserve 368,966    
Allocation Of Net Income 893,383    
Allocation Of Dividends [Abstract]      
Minimum mandatory dividends for the period (50% of the adjusted net income) 424,357    
Additional dividends to minimum mandatory dividends 55,391    
Total allocation (R$ 0.44 per share) R$ 479,748