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9. Trade receivables (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Trade Receivables Details 3      
Write-offs R$ (171,729) R$ (177,492) R$ (63,076)
(Losses)/reversal with state entities - related parties 21,510 (7,292) (3,999)
Losses with private sector / government entities (75,973) (144,217) (103,231)
Losses with wholesale customers 9,781 (2,596) (10,107)
Recoveries 133,730 241,109 177,993
Amount reported in selling expenses R$ 82,681 R$ 90,488 R$ 2,420