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Equity (Details 3) (Detail) - BRL (R$)
R$ / shares in Units, shares in Thousands, R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Boa Compra [Abstract]      
Net income for the year R$ 5,715 R$ 4,858 R$ 1,625
Adjusted income for the year R$ 5,715 R$ 4,858 1,625
Mandatory minimum dividends (1%)     16
Additional dividends proposed     65
Total dividends distributed     R$ 81
Number of common shares 5,381,317 5,381,317 198,557
Dividends per share (in reais) R$ 0.0000 R$ 0.0000 R$ 0.4079