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Post-employment Benefits - Summary of Plan Assets (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value of plan assets [line items]    
Plan assets at fair value R$ 484,895 R$ 513,650
Percentage fair value of plan assets 100.00% 100.00%
Fixed income bonds [member]    
Disclosure of fair value of plan assets [line items]    
Plan assets at fair value R$ 484,847 R$ 513,470
Percentage fair value of plan assets 99.99% 99.96%
Other [member]    
Disclosure of fair value of plan assets [line items]    
Plan assets at fair value R$ 48 R$ 180
Percentage fair value of plan assets 0.01% 0.04%