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Risks and Financial Instruments - Fair values and the carrying values of the financial instruments (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of risks and financial instruments [line items]
Financial assets, carrying value	R$ 6,994,406	R$ 6,369,928
Financial assets, fair value	6,994,406	6,369,928
Financial liabilities, carrying value	15,329,244	13,762,053
Financial liabilities, fair value	R$ 15,224,750	13,784,913
Cash and bank deposits [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial assets, carrying value	R$ 205,482	147,926
Financial assets, fair value	R$ 205,482	147,926
Financial investments local currency [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through other comprehensive income
Financial assets, carrying value	R$ 3,722,308	4,821,605
Financial assets, fair value	R$ 3,722,308	4,821,605
Financial investments foreign currency [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial assets, carrying value	R$ 11,161	32,473
Financial assets, fair value	R$ 11,161	32,473
Fixed income securities local currency1 [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial assets, carrying value	R$ 2,462,018	1,076,849
Financial assets, fair value	R$ 2,462,018	1,076,849
Fixed income securities local currency2 [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through other comprehensive income
Financial assets, carrying value	R$ 2,208	2,720
Financial assets, fair value	R$ 2,208	2,720
Fixed income securities local currency3 [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial assets, carrying value	R$ 73,089	73,471
Financial assets, fair value	R$ 73,089	73,471
Fixed income securities foreign currency [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through other comprehensive income
Financial assets, carrying value	R$ 154,811	129,131
Financial assets, fair value	R$ 154,811	129,131
Currency interest rate hedging instruments [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial assets, carrying value	R$ 363,329	85,753
Financial assets, fair value	R$ 363,329	85,753
Financing [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial liabilities, carrying value	R$ 1,567,374	1,047,809
Financial liabilities, fair value	R$ 1,567,374	1,047,809
Financing [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial liabilities, carrying value	R$ 6,889,310	6,740,872
Financial liabilities, fair value	R$ 6,840,079	6,761,907
Debentures [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial liabilities, carrying value	R$ 5,826,242	5,035,247
Financial liabilities, fair value	R$ 5,770,979	5,037,072
Debentures 1 [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial liabilities, carrying value	R$ 833,213	554,402
Financial liabilities, fair value	R$ 833,213	554,402
Finance Leases [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial liabilities, carrying value	R$ 46,066	48,515
Financial liabilities, fair value	R$ 46,066	48,515
Currency interest rate hedging [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial liabilities, carrying value	R$ 43,944	163,749
Financial liabilities, fair value	R$ 43,944	163,749
Subscription warrants indemnification [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial liabilities, carrying value	R$ 123,095	171,459
Financial liabilities, fair value	R$ 123,095	R$ 171,459

X

- Definition

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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