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12. FINANCIAL INSTRUMENTS (Details 2) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) 221,437,207 221,437,207
Closing Balance R$ 2,200,459 R$ 1,353,664
Variation in the carrying amount R$ 846,795  
Common    
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) 107,156,651 107,156,651
Share price R$ 10.83 R$ 8.26
Closing Balance R$ 1,160,506 R$ 885,114
Share price variation in the year R$ 2.57  
Variation in the carrying amount R$ 275,392  
Preferred    
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) 114,280,556 114,280,556
Share price R$ 9.10 R$ 4.10
Closing Balance R$ 1,039,953 R$ 468,550
Share price variation in the year R$ 5.00  
Variation in the carrying amount R$ 571,403