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Income Taxes - Additional Information (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Accounting Profit Multiplied by Applicable Tax Rates [line items]      
Brazilian statutory rate 34.00% 34.00% 34.00%
Other subsidiaries [member]      
Reconciliation of Accounting Profit Multiplied by Applicable Tax Rates [line items]      
Unused tax losses and other temporary differences R$ 2,714 R$ 5,439  
Top of range [member]      
Reconciliation of Accounting Profit Multiplied by Applicable Tax Rates [line items]      
Percentage of taxable profit used to offset loss carryforward 30.00%