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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, 2019	Dec. 31, 2018
Summary of risks and financial instruments [line items]
Financial assets, carrying value	R$ 10,202,533	R$ 11,860,812
Financial assets, fair value	10,214,435	11,858,848
Financial liabilities, carrying value	18,812,123	18,060,921
Financial liabilities, fair value	R$ 19,997,517	17,935,102
Cash and bank deposits [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial assets, carrying value	R$ 284,992	205,482
Financial assets, fair value	R$ 284,992	205,482
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$ 1,780,939	3,722,308
Financial assets, fair value	R$ 1,780,939	3,722,308
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$ 49,448	11,161
Financial assets, fair value	R$ 49,448	11,161
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$ 1,937,967	2,462,018
Financial assets, fair value	R$ 1,937,967	2,462,018
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$ 595,816	2,208
Financial assets, fair value	R$ 595,816	2,208
Fixed income securities local currency3 [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial assets, carrying value	R$ 76,904	73,089
Financial assets, fair value	R$ 76,904	73,089
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$ 303,417	154,811
Financial assets, fair value	R$ 303,417	154,811
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$ 682,615	363,329
Financial assets, fair value	R$ 682,615	363,329
Trade receivables [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial assets, carrying value	R$ 3,689,500	4,150,876
Financial assets, fair value	R$ 3,663,247	4,111,971
Reseller financing [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial assets, carrying value	R$ 800,936	715,530
Financial assets, fair value	R$ 839,090	752,471
Financing [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial liabilities, carrying value	R$ 1,666,092	1,567,374
Financial liabilities, fair value	R$ 1,666,092	1,567,374
Financing [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial liabilities, carrying value	R$ 6,008,415	6,889,310
Financial liabilities, fair value	R$ 7,268,742	6,840,079
Debentures [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial liabilities, carrying value	R$ 5,657,339	5,826,242
Financial liabilities, fair value	R$ 5,603,669	5,770,979
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$ 1,030,892	833,213
Financial liabilities, fair value	R$ 1,030,891	833,213
Lease payable [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial liabilities, carrying value	R$ 1,588,673	46,066
Financial liabilities, fair value	R$ 1,588,673	46,066
Commodities currency and interest rate hedging instruments [member]
Summary of risks and financial instruments [line items]
Category	Measured at fair value through profit or loss
Financial liabilities, carrying value	R$ 29,985	43,944
Financial liabilities, fair value	R$ 29,985	43,944
Trade payable [member]
Summary of risks and financial instruments [line items]
Category	Measured at amortized cost
Financial liabilities, carrying value	R$ 2,700,071	2,731,677
Financial liabilities, fair value	R$ 2,678,808	2,710,352
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$ 130,657	123,095
Financial liabilities, fair value	R$ 130,657	R$ 123,095

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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