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Presentation of Financial Statements and Summary of Significant Accounting Policies - Summary of Impairment Loss of Subsidiary (Detail) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 BRL (R$)
Disclosure of impairment loss and reversal of impairment loss [line items] |
Total of impairment loss | R$ 5,565
Current assets [member] |
Disclosure of impairment loss and reversal of impairment loss [line items] |
Total of impairment loss | 3,138
Current assets [member] | Cash and cash equivalents [member] |
Disclosure of impairment loss and reversal of impairment loss [line items] |
Total of impairment loss | 1,703
Current assets [member] | Trade receivables [member] |
Disclosure of impairment loss and reversal of impairment loss [line items] |
Total of impairment loss | 290
Current assets [member] | Inventories [member] |
Disclosure of impairment loss and reversal of impairment loss [line items] |
Total of impairment loss | 985
Current assets [member] | Other receivables [member] |
Disclosure of impairment loss and reversal of impairment loss [line items] |
Total of impairment loss | 160
Non-current assets [member] | Property, plant and equipment [member] |
Disclosure of impairment loss and reversal of impairment loss [line items] |
Total of impairment loss | R$ 2,427

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