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15. TAX INSTALLMENTS PROGRAMS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of liabilities [line items]    
REFIS debts and other tax installment payment plans, current R$ 21,551 R$ 24,444
REFIS debts and other tax installment payment plans, noncurrent 79,242 83,312
Federal REFIS Law 11.941/09    
Disclosure of fair value measurement of liabilities [line items]    
REFIS debts and other tax installment payment plans, current 12,552 11,956
REFIS debts and other tax installment payment plans, noncurrent 20,083 19,779
Federal REFIS Law 12.865/13    
Disclosure of fair value measurement of liabilities [line items]    
REFIS debts and other tax installment payment plans, current 5,984 5,572
REFIS debts and other tax installment payment plans, noncurrent 56,381 57,905
Other refinancing program    
Disclosure of fair value measurement of liabilities [line items]    
REFIS debts and other tax installment payment plans, current 3,015 6,916
REFIS debts and other tax installment payment plans, noncurrent R$ 2,778 R$ 5,628