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Fixed Assets - Summary of Fixed Assets (Parenthetical) (Detail) - BRL (R$)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Contractual commitments for purchase of fixed assets R$ 41,000,000 R$ 181,000,000 R$ 48,000,000
EDP systems related to attached real estate 3,000,000 3,000,000 4,000,000
Fixed assets impairment 0 R$ 0 R$ 0
Hyperinflationary [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Other changes property plant and equipment R$ 209,000,000