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TRADE ACCOUNTS RECEIVABLE - Summary (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | R$ 2,798,420 | R$ 3,576,699
Gross | Trade accounts receivable - in Brazil |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 1,265,431 | 1,251,739
Gross | Trade accounts receivable - exports from Brazil |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 139,162 | 265,252
Gross | Trade accounts receivable - foreign subsidiaries |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 1,525,466 | 2,259,014
Allowance for doubtful accounts |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | R$ (131,639) | R$ (199,306)

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