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Finance income (Expense) - Finance Income (Expense) (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finance income (Expense) [abstract]      
Interest on financial investments R$ 135,502 R$ 302,793 R$ 328,625
Interest from customers 134,001 138,462 135,514
Changes in subscription warrants - indemnification     44,484
Selic interest on extraordinary PIS/COFINS credits 242,661 11,146 168,564
Other finance income 15,546 4,888 4,048
Finance income 527,710 457,289 681,235
Interest on loans (372,017) (388,897) (440,641)
Interest on debentures (321,654) (482,361) (441,394)
Interest on leases payable (147,687) (132,994) (2,670)
Bank charges, financial transactions tax, and other charges (79,882) (62,687) (92,558)
Exchange variation, net of gains and losses with derivative financial instruments 158,007 134,544 172,701
Changes in subscription warrants – indemnification (17,353) (7,760)  
Interest of provisions and other expenses (16,498) (23,988) 9,791
Finance expenses (797,084) (964,143) (794,771)
Financial result, net R$ (269,374) R$ (506,854) R$ (113,536)