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Related Parties - Summary of Expenses for Compensation of Its Key Executives (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of related parties [line items]      
Compensation expense of key executives R$ 41,094 R$ 50,307 R$ 51,542
Short-term compensation [member]      
Summary of related parties [line items]      
Compensation expense of key executives 36,504 45,477 40,306
Stock compensation [member]      
Summary of related parties [line items]      
Compensation expense of key executives 1,407 1,399 5,427
Post employment benefits [member]      
Summary of related parties [line items]      
Compensation expense of key executives 2,278 1,096 3,336
Long-term compensation [member]      
Summary of related parties [line items]      
Compensation expense of key executives   (6,459) R$ 2,473
Termination benefit [member]      
Summary of related parties [line items]      
Compensation expense of key executives R$ 905 R$ 8,794