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Payables to third parties (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Trade and other payables [abstract]      
Payables to third parties R$ 2,975,297 R$ 3,080,569 R$ 1,304,031
Total R$ 2,975,297 R$ 3,080,569 R$ 1,304,031