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Financial Income (Expense) - Financial Income (Expense) (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial income expense details [abstract]      
Interest on financial investments R$ 302,793 R$ 328,625 R$ 475,460
Interest from customers 138,462 135,514 105,773
Changes in subscription warranty-indemnification (see Note 24) 0 44,484  
Selic interest on PIS and COFINS credits (see Notes 7.a.2 and 21.a.1.2) 0 168,564  
Other financial income 16,034 4,048 3,868
Financial income 457,289 681,235 585,101
Interest on loans (388,897) (440,641) (672,102)
Interest on debentures (482,361) (441,394) (385,009)
Interest on finance leases (132,994) (2,670) (4,991)
Bank charges, financial transactions tax, and other charges (62,687) (92,558) (91,614)
Exchange variation, net of gains and losses with derivative instruments 134,544 172,701 72,869
Reversal of provision - ICMS from PIS and COFINS tax bases (see Note 21.a.1.2) 0   43,411
Changes in subscription warranty-indemnification (see Note 24) (7,760)   (20,360)
TCC interest - Bahiana (see Notes 21.b.2.2 and 29) 0   (13,509)
Interest of provisions, net, and other financial expenses (23,988) 9,791 11,908
Financial expenses (964,143) (794,771) (1,059,397)
Financial income (expense) R$ (506,854) R$ (113,536) R$ (474,296)