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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
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