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8. INVESTMENTS (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Oct. 15, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
InvestmentsLineItems [Line Items]        
Net revenue   R$ 25,436,417 R$ 22,968,885 R$ 18,524,601
Cost of sales and services   17,263,264 16,105,657 13,596,141
Gross profit   8,173,153 6,863,228 4,928,460
Operating (expenses) income   (4,631,236) 83,332 (1,944,495)
Income before income tax and social contribution   1,410,733 5,450,917 520,338
Current and deferred income tax and social contribution   (833,778) 250,334 409,109
Profit (Loss) for the year R$ 1,000,000 R$ 2,244,511 R$ 5,200,583 R$ 111,229
Joint Venture [Member] | Transnordestina Logistica [Member]        
InvestmentsLineItems [Line Items]        
Direct equity interest, joint venture and joint operation   47.26% 46.30%  
Operating (expenses) income   R$ (18,077) R$ (18,020)  
Financial income (expenses), net   (18,386) (26,103)  
Income before income tax and social contribution   (36,463) (44,123)  
Profit (Loss) for the year   R$ (36,463) R$ (44,123)  
Joint Venture [Member] | CBSI [Member]        
InvestmentsLineItems [Line Items]        
Direct equity interest, joint venture and joint operation   50.00% 50.00%  
Net revenue   R$ 267,436 R$ 166,080  
Cost of sales and services   233,830 142,254  
Gross profit   33,606 23,826  
Operating (expenses) income   (12,328) (10,884)  
Financial income (expenses), net   (1,460) (179)  
Income before income tax and social contribution   19,818 12,763  
Current and deferred income tax and social contribution   (6,428) (3,761)  
Profit (Loss) for the year   R$ 13,390 R$ 9,002  
Joint Venture [Member] | MRS Logistica [Member]        
InvestmentsLineItems [Line Items]        
Direct equity interest, joint venture and joint operation   34.94% 34.94%  
Net revenue   R$ 3,200,809 R$ 3,726,448  
Cost of sales and services   2,382,828 2,476,628  
Gross profit   817,981 1,249,820  
Operating (expenses) income   207,840 (313,606)  
Financial income (expenses), net   (268,089) (151,839)  
Income before income tax and social contribution   757,732 784,375  
Current and deferred income tax and social contribution   (254,378) (262,760)  
Profit (Loss) for the year   R$ 503,354 R$ 521,615  
Joint Operation [Member] | Ita Energetica [Member]        
InvestmentsLineItems [Line Items]        
Direct equity interest, joint venture and joint operation   48.75% 48.75%  
Net revenue   R$ 163,048 R$ 166,358  
Cost of sales and services   83,129 77,829  
Gross profit   79,919 88,529  
Operating (expenses) income   (62,660) (60,104)  
Financial income (expenses), net   1,183 (126)  
Income before income tax and social contribution   18,442 28,299  
Current and deferred income tax and social contribution   (6,147) (9,452)  
Profit (Loss) for the year   R$ 12,295 R$ 18,847