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Cash and Cash Equivalents and Financial Investments - Cash and cash equivalents (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Cash and cash equivalents and financial investments details [abstract] |  |  |  |  |
Cash and bank deposits In local currency | R$ 117,231 | R$ 73,128 |  |  |
In foreign currency | 88,251 | 74,798 |  |  |
Fixed-income securities | 3,722,308 | 4,821,605 |  |  |
Fixed-income securities | 11,161 | 32,473 |  |  |
Total cash and cash equivalents | R$ 3,938,951 | R$ 5,002,004 | R$ 4,274,158 | R$ 4,274,158 | R$ 2,702,893

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of cash on hand and bank deposits in foreign currency. + References No definition available. + Details
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