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9. INVESTMENTS (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]      
Net revenues R$ 22,968,885 R$ 18,524,601 R$ 17,148,949
Cost of sales and services 16,105,657 13,596,141 12,640,042
Gross profit 6,863,228 4,928,460 4,508,907
Operating (expense) income 83,332 (1,944,495) (2,563,431)
Finance income (costs), net (1,495,643) (2,463,627) (2,522,427)
Income before income tax and social contribution 5,450,917 520,338 (576,951)
Current and deferred income tax and social contribution 250,334 409,109 266,546
Profit (loss) for the year (5,200,583) (111,229) R$ 853,058
Ita Energetica | Joint Operation      
Disclosure of fair value measurement of assets [line items]      
Net revenues 166,358 168,194  
Cost of sales and services (77,829) (76,810)  
Gross profit 88,529 91,384  
Operating (expense) income (60,104) (58,465)  
Finance income (costs), net (126) 317  
Income before income tax and social contribution 28,299 33,236  
Current and deferred income tax and social contribution (9,452) (11,105)  
Profit (loss) for the year 18,847 22,131  
Joint Venture | MRS Logistica      
Disclosure of fair value measurement of assets [line items]      
Net revenues 3,726,448 3,492,805  
Cost of sales and services (2,476,628) (2,307,108)  
Gross profit 1,249,820 1,185,697  
Operating (expense) income (313,606) (283,151)  
Finance income (costs), net (151,839) (187,295)  
Income before income tax and social contribution 784,375 715,251  
Current and deferred income tax and social contribution (262,760) (254,001)  
Profit (loss) for the year 521,615 461,250  
Joint Venture | CBSI      
Disclosure of fair value measurement of assets [line items]      
Net revenues 166,080 135,399  
Cost of sales and services (142,254) (120,647)  
Gross profit 23,826 14,752  
Operating (expense) income (10,884) (8,340)  
Finance income (costs), net (179) (1,004)  
Income before income tax and social contribution 12,763 5,408  
Current and deferred income tax and social contribution (3,761) (1,838)  
Profit (loss) for the year 9,002 3,570  
Joint Venture | Transnordestina Logistica      
Disclosure of fair value measurement of assets [line items]      
Net revenues   0  
Cost of sales and services   0  
Gross profit   0  
Operating (expense) income (18,020) (32,245)  
Finance income (costs), net (26,103) (13,938)  
Income before income tax and social contribution (44,123) (46,183)  
Current and deferred income tax and social contribution   0  
Profit (loss) for the year R$ (44,123) R$ (46,183)