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31. Risks and Financial Instruments (Details 9) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Financial assets, fair value	R$ 6,369,928	R$ 5,701,849
Level 1	6,195,600	5,480,783
Level 2	174,328	221,066
Level 3	0	0
Financial liabilities, fair value	13,784,913	11,461,409
Level 1	2,523,643	2,338,920
Level 2	11,261,270	9,122,489
Level 3	R$ 0	R$ 0
Cash and bank deposits
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Loans and receivables	Loans and receivables
Financial assets, fair value	R$ 147,926	R$ 113,318
Level 1	147,926	113,318
Level 2	0	0
Level 3	R$ 0	R$ 0
Financial investments in local currency
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial assets, fair value	R$ 4,821,605	R$ 3,837,807
Level 1	4,821,605	3,837,807
Level 2	0	0
Level 3	R$ 0	R$ 0
Financial investments in foreign currency
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial assets, fair value	R$ 32,473	R$ 323,033
Level 1	32,473	323,033
Level 2	0	0
Level 3	R$ 0	R$ 0
Fixed-income securities and funds in local currency
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Available for sale	Available for sale
Financial assets, fair value	R$ 68,742	R$ 113,640
Level 1	68,742	113,640
Level 2	0	0
Level 3	R$ 0	R$ 0
Fixed-income securities and funds in local currency
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial assets, fair value	R$ 1,076,849	R$ 1,053,369
Level 1	1,076,849	1,053,369
Level 2	0	0
Level 3	R$ 0	R$ 0
Fixed-income securities and funds in local currency
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Held to maturity	Held to maturity
Financial assets, fair value	R$ 7,449	R$ 7,449
Level 1	7,449	7,449
Level 2	0	0
Level 3	R$ 0	R$ 0
Fixed-income securities and funds in foreign currency
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Available for sale	Available for sale
Financial assets, fair value	R$ 129,131	R$ 34,775
Level 1	40,556	32,167
Level 2	88,575	2,608
Level 3	R$ 0	R$ 0
Currency and interest rate hedging instruments
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial assets, fair value	R$ 85,753	R$ 218,458
Level 1	0	0
Level 2	85,753	218,458
Level 3	0	0
Total
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Financial assets, fair value	6,369,928	5,701,849
Level 1	6,195,600	5,480,783
Level 2	174,328	221,066
Level 3	R$ 0	R$ 0
Financing
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial liabilities, fair value	R$ 1,047,809	R$ 1,428,907
Level 1	0	0
Level 2	1,047,809	1,428,907
Level 3	R$ 0	R$ 0
Financing
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at amortized cost	Measured at amortized cost
Financial liabilities, fair value	R$ 6,761,907	R$ 6,881,085
Level 1	2,523,643	2,338,920
Level 2	4,238,264	4,542,165
Level 3	R$ 0	R$ 0
Debentures
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at amortized cost	Measured at amortized cost
Financial liabilities, fair value	R$ 5,037,072	R$ 2,746,915
Level 1	0	0
Level 2	5,037,072	2,746,915
Level 3	R$ 0	R$ 0
Debentures
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at fair value through profit or loss
Financial liabilities, fair value	R$ 554,402
Level 1	0
Level 2	554,402
Level 3	R$ 0
Finance Leases
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at amortized cost	Measured at amortized cost
Financial liabilities, fair value	R$ 48,515	R$ 48,716
Level 1	0	0
Level 2	48,515	48,716
Level 3	R$ 0	R$ 0
Currency and interest rate hedging instruments
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial liabilities, fair value	R$ 163,749	R$ 202,357
Level 1	0	0
Level 2	163,749	202,357
Level 3	R$ 0	R$ 0
Subscription warrants - indemnification
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial liabilities, fair value	R$ 171,459	R$ 153,429
Level 1	0	0
Level 2	171,459	153,429
Level 3	0	0
Total
SummaryOfRisksAndFinancialInstrumentsLineItems [Line Items]
Financial liabilities, fair value	13,784,913	11,461,409
Level 1	2,523,643	2,338,920
Level 2	11,261,270	9,122,489
Level 3	R$ 0	R$ 0

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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