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Management Of Financial Risks And Financial Instruments - Summary Of Sensitivity Analysis (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Financial Liabilities In to Groupings Based on Their Contractual Maturities [Line Items]    
Sensitivity analysis increase decrease in one percent R$ (3,581) R$ (93)
Sensitivity analysis increase decrease in twenty five percent (173,542) (25,565)
Sensitivity analysis increase decrease in fifty percent (460,503) (36,161)
Prefixed Member | Interest rate risk [member]    
Disclosure of Financial Liabilities In to Groupings Based on Their Contractual Maturities [Line Items]    
Sensitivity analysis increase decrease in one percent (907) (559)
Sensitivity analysis increase decrease in twenty five percent (163,057) (11,441)
Sensitivity analysis increase decrease in fifty percent (445,866) (22,881)
Exchange Coupons Member | Currency risk [member]    
Disclosure of Financial Liabilities In to Groupings Based on Their Contractual Maturities [Line Items]    
Sensitivity analysis increase decrease in one percent (67) (9)
Sensitivity analysis increase decrease in twenty five percent 570 (5,764)
Sensitivity analysis increase decrease in fifty percent (854) (11,529)
Foreign Currencies [member] | Exchange Rates [member]    
Disclosure of Financial Liabilities In to Groupings Based on Their Contractual Maturities [Line Items]    
Sensitivity analysis increase decrease in one percent (2,102) (386)
Sensitivity analysis increase decrease in twenty five percent (1,493) (978)
Sensitivity analysis increase decrease in fifty percent 43,908 (5,027)
PriceIndexes Member | Inflation Coupon Rates Member    
Disclosure of Financial Liabilities In to Groupings Based on Their Contractual Maturities [Line Items]    
Sensitivity analysis increase decrease in one percent (63) (16)
Sensitivity analysis increase decrease in twenty five percent (782) (798)
Sensitivity analysis increase decrease in fifty percent (301) (1,597)
Shares [member] | Shares Prices Member    
Disclosure of Financial Liabilities In to Groupings Based on Their Contractual Maturities [Line Items]    
Sensitivity analysis increase decrease in one percent (442) 877
Sensitivity analysis increase decrease in twenty five percent (8,780) (6,584)
Sensitivity analysis increase decrease in fifty percent R$ (57,390) R$ 4,873