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TRADE ACCOUNTS RECEIVABLE - Accounts receivable by aging (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
Allowance for doubtful accounts |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | (131,639) | (199,306)
Current | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 2,234,723 | 2,917,073
Past due: Up to 30 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 467,901 | 506,780
Past due: From 31 to 60 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 96,852 | 128,715
Past due: From 61 to 90 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 17,636 | 37,559
Past due: From 91 to 180 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 27,841 | 53,460
Past due: From 181 to 360 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | 22,985 | 66,444
Past due: Above 360 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade account receivable - net | R$ 62,121 | R$ 65,974

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