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12. FINANCIAL INSTRUMENTS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets R$ 2,222,433 R$ 1,374,268
Fair value of assets through profit loss 2,952 5,264
Loans and receivables 6,921,521 8,031,434
Other assets measured at amortized costs 41,528 37,679
Total assets 9,188,434 9,448,645
Fair value of liabilities through profit loss 121
Other liabilities measured at amortized costs 32,541,183 32,781,529
Total liabilities 32,541,183 32,781,650
Current assets    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets
Fair value of assets through profit loss 2,952 5,264
Loans and receivables 6,346,803 7,536,183
Other assets measured at amortized costs 41,528 37,679
Total assets 6,391,283 7,579,126
Current assets | Cash and cash equivalants    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets
Fair value of assets through profit loss
Loans and receivables 3,411,572 4,871,162
Other assets measured at amortized costs
Total assets 3,411,572 4,871,162
Current assets | Short-term investments    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets
Fair value of assets through profit loss
Loans and receivables 735,712 760,391
Other assets measured at amortized costs
Total assets 735,712 760,391
Current assets | Trade receivables    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets
Fair value of assets through profit loss
Loans and receivables 2,197,078 1,904,630
Other assets measured at amortized costs
Total assets 2,197,078 1,904,630
Current assets | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets  
Fair value of assets through profit loss 2,298
Loans and receivables
Other assets measured at amortized costs
Total assets   2,298
Current assets | Trading securities    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets
Fair value of assets through profit loss 2,952 2,966
Loans and receivables
Other assets measured at amortized costs
Total assets 2,952 2,966
Current assets | Dividends receivable    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets
Fair value of assets through profit loss
Loans and receivables
Other assets measured at amortized costs 41,528 37,679
Total assets 41,528 37,679
Non-current assets    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets 2,222,433 1,374,268
Fair value of assets through profit loss
Loans and receivables 574,718 495,251
Other assets measured at amortized costs
Total assets 2,797,151 1,869,519
Non-current assets | Other trade receivables    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets
Fair value of assets through profit loss
Loans and receivables 20,024 15,291
Other assets measured at amortized costs
Total assets 20,024 15,291
Non-current assets | Investments    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets 2,222,433 1,374,268
Fair value of assets through profit loss
Loans and receivables
Other assets measured at amortized costs
Total assets 2,222,433 1,374,268
Non-current assets | Loans - related parties    
Disclosure of detailed information about financial instruments [line items]    
Available for sale assets
Fair value of assets through profit loss
Loans and receivables 554,694 479,960
Other assets measured at amortized costs
Total assets 554,694 479,960
Current liabilities    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss 121
Other liabilities measured at amortized costs 9,523,230 4,398,727
Total liabilities 9,523,230 4,398,848
Current liabilities | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss 121
Other liabilities measured at amortized costs
Total liabilities 121
Current liabilities | Borrowings and financing    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss
Other liabilities measured at amortized costs 6,551,764 2,150,951
Total liabilities 6,551,764 2,150,951
Current liabilities | Trade payables    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss
Other liabilities measured at amortized costs 2,460,774 1,763,206
Total liabilities 2,460,774 1,763,206
Current liabilities | Dividends and JCP    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss
Other liabilities measured at amortized costs 510,692 484,570
Total liabilities 510,692 484,570
Non-current liabilities    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss
Other liabilities measured at amortized costs 23,017,953 28,382,802
Total liabilities 23,017,953 28,382,802
Non-current liabilities | Borrowings and financing    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss
Other liabilities measured at amortized costs 23,017,953 28,382,802
Total liabilities R$ 23,017,953 R$ 28,382,802