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Risks and Financial Instruments - Summary of the financial assets and financial liabilities measured at fair value (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, fair value	R$ 6,994,406	R$ 6,369,928
Financial liabilities, fair value	15,224,750	13,784,913
Level 1 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	2,680,327	1,297,804
Financial liabilities, fair value	2,841,436	2,523,643
Level 2 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	4,314,079	5,072,124
Financial liabilities, fair value	R$ 12,383,314	R$ 11,261,270
Financing [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial liabilities, fair value	R$ 1,567,374	R$ 1,047,809
Financing [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial liabilities, fair value	R$ 1,567,374	R$ 1,047,809
Financing [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost	Measured at amortized cost
Financial liabilities, fair value	R$ 6,840,079	R$ 6,761,907
Financing [member] | Level 1 [member]
Summary of risks and financial instruments [line items]
Financial liabilities, fair value	2,841,436	2,523,643
Financing [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial liabilities, fair value	R$ 3,998,643	R$ 4,238,264
Debentures [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost	Measured at amortized cost
Financial liabilities, fair value	R$ 5,770,979	R$ 5,037,072
Debentures [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial liabilities, fair value	R$ 5,770,979	5,037,072
Debentures 2 [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial liabilities, fair value	R$ 833,213	554,402
Debentures 2 [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial liabilities, fair value	R$ 833,213	R$ 554,402
Finance Leases [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost	Measured at amortized cost
Financial liabilities, fair value	R$ 46,066	R$ 48,515
Finance Leases [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial liabilities, fair value	R$ 46,066	R$ 48,515
Currency interest rate hedging [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial liabilities, fair value	R$ 43,944	R$ 163,749
Currency interest rate hedging [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial liabilities, fair value	R$ 43,944	R$ 163,749
Subscription warrants indemnification [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial liabilities, fair value	R$ 123,095	R$ 171,459
Subscription warrants indemnification [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial liabilities, fair value	R$ 123,095	R$ 171,459
Cash and bank deposits [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost	Measured at amortized cost
Financial assets, fair value	R$ 205,482	R$ 147,926
Cash and bank deposits [member] | Level 1 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	R$ 205,482	R$ 147,926
Financial investments local currency [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through other comprehensive income	Measured at fair value through profit or loss
Financial assets, fair value	R$ 3,722,308	R$ 4,821,605
Financial investments local currency [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	R$ 3,722,308	R$ 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	Measured at fair value through profit or loss
Financial assets, fair value	R$ 11,161	R$ 32,473
Financial investments foreign currency [member] | Level 1 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	R$ 11,161	R$ 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	Measured at fair value through profit or loss
Financial assets, fair value	R$ 2,462,018	R$ 1,076,849
Fixed income securities local currency1 [member] | Level 1 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	R$ 2,462,018	R$ 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	Measured at fair value through other comprehensive income
Financial assets, fair value	R$ 2,208	R$ 2,720
Fixed income securities local currency2 [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	R$ 2,208	R$ 2,720
Fixed income securities local currency3 [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost	Measured at amortized cost
Financial assets, fair value	R$ 73,089	R$ 73,471
Fixed income securities local currency3 [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	R$ 73,089	R$ 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	Measured at fair value through other comprehensive income
Financial assets, fair value	R$ 154,811	R$ 129,131
Fixed income securities foreign currency [member] | Level 1 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	1,666	40,556
Fixed income securities foreign currency [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	R$ 153,145	R$ 88,575
Currency interest rate hedging instruments [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss	Measured at fair value through profit or loss
Financial assets, fair value	R$ 363,329	R$ 85,753
Currency interest rate hedging instruments [member] | Level 2 [member]
Summary of risks and financial instruments [line items]
Financial assets, fair value	R$ 363,329	R$ 85,753
Debentures 1 [member]
Summary of risks and financial instruments [line items]
Category		Measured at fair value through profit or loss

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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