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10. PROPERTY, PLANT AND EQUIPMENT (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 3,282,436 R$ 2,475,935
Logistics    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress 89,595 106,956
Logistics | Current investments to maintain current operations at their full capacity    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress 89,595 106,956
Mining    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress 1,859,108 1,435,332
Mining | Current investments to maintain current operations at their full capacity    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 725,616 408,522
Mining | Expansion of Casa de Pedra Mine capacity production    
Disclosure of detailed information about property, plant and equipment [line items]    
Start date 2007  
Completion date 2020  
Construction in progress R$ 844,194 750,999
Mining | Expansion of TECAR export capacity    
Disclosure of detailed information about property, plant and equipment [line items]    
Start date 2009  
Completion date 2022  
Construction in progress R$ 289,298 275,811
Steel    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress 653,842 327,512
Steel | Current investments to maintain current operations at their full capacity    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 558,922 228,029
Steel | Supply of 16 torpedo's cars for operation in the steel industry    
Disclosure of detailed information about property, plant and equipment [line items]    
Start date 2008  
Completion date 2020  
Construction in progress R$ 94,920 99,483
Cement    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress 679,891 606,135
Cement | Current investments to maintain current operations at their full capacity    
Disclosure of detailed information about property, plant and equipment [line items]    
Construction in progress R$ 94,728 51,270
Cement | Construction of cement plants    
Disclosure of detailed information about property, plant and equipment [line items]    
Start date 2011  
Completion date 2023  
Construction in progress R$ 585,163 R$ 554,865