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8. INVESTMENTS (Details 5) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of fair value measurement of assets [line items]      
Net revenues R$ 18,524,601 R$ 17,148,949 R$ 15,261,697
Cost of sales and services 13,596,141 12,640,042 11,740,101
Gross profit 4,928,460 4,508,907 3,521,596
Operating (expense) income (1,944,495) (2,563,431) 1,528,907
Finance income (costs), net (2,463,627) (2,522,427) (3,365,162)
Income before income tax and social contribution 520,338 (576,951) 1,685,341
Current and deferred income tax and social contribution 409,109 266,546 2,903,216
Profit (loss) for the year (111,229) 853,058 R$ 1,215,964
Ita Energetica | Joint Operation      
Disclosure of fair value measurement of assets [line items]      
Net revenues 168,194 172,263  
Cost of sales and services (76,810) (91,568)  
Gross profit 91,384 80,695  
Operating (expense) income (58,465) (54,616)  
Finance income (costs), net 317 397  
Income before income tax and social contribution 33,236 26,476  
Current and deferred income tax and social contribution (11,105) (8,854)  
Profit (loss) for the year 22,131 17,622  
Joint Venture | MRS Logistica      
Disclosure of fair value measurement of assets [line items]      
Net revenues 3,492,805 3,279,420  
Cost of sales and services (2,307,108) (2,208,786)  
Gross profit 1,185,697 1,070,634  
Operating (expense) income (283,151) (160,187)  
Finance income (costs), net (187,295) (249,300)  
Income before income tax and social contribution 715,251 661,147  
Current and deferred income tax and social contribution (254,001) (243,602)  
Profit (loss) for the year 461,250 417,545  
Joint Venture | CBSI      
Disclosure of fair value measurement of assets [line items]      
Net revenues 135,399 122,870  
Cost of sales and services (120,647) (105,692)  
Gross profit 14,752 17,178  
Operating (expense) income (8,340) (8,367)  
Finance income (costs), net (1,004) (1,676)  
Income before income tax and social contribution 5,408 7,135  
Current and deferred income tax and social contribution (1,838) (1,229)  
Profit (loss) for the year 3,570 5,906  
Joint Venture | Transnordestina Logistica      
Disclosure of fair value measurement of assets [line items]      
Net revenues 0 0  
Cost of sales and services 0 0  
Gross profit 0 0  
Operating (expense) income (32,245) (97,596)  
Finance income (costs), net (13,938) (6,032)  
Income before income tax and social contribution (46,183) 103,628  
Current and deferred income tax and social contribution 0 0  
Profit (loss) for the year R$ (46,183) R$ 103,628