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Presentation of Financial Statements and Summary of Significant Accounting Policies - Additional Information (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basis Of Presentation And Summary Of Significant Accounting Policies [line items]
Research and development expense recognized	R$ 61,589	R$ 63,085	R$ 55,836
Cumulative translation adjustments	102,427	65,857	53,061	R$ 7,519
Gains and losses from changes in foreign investments	R$ 2,444	R$ 4,090	R$ 7,368
Nominal discount rate	4.81%	11.04%

X

- Definition

The gains (losses) recognised in other comprehensive income on hedges of net investments in foreign operations, before tax. [Refer: Other comprehensive income]

+ References

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

+ References

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- Definition

The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment.

+ References

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Basis of presentation and summary of significant accounting policies.

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The gains (losses) recognised in other comprehensive income resulting from varying exchange rates.

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