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Financial Income (Expense) - Financial Income (Expense) (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial income expense details [abstract]      
Interest on financial investments R$ 328,625 R$ 475,460 R$ 404,080
Interest from customers 135,514 105,773 103,976
Changes in subscription warranty-indemnification (see Note 24) 44,484    
Selic interest on PIS and COFINS credits (see Notes 7.a.2 and 21.a.1.2) 168,564    
Other financial income 4,048 3,868 5,187
Financial income 681,235 585,101 513,243
Interest on loans (440,641) (672,102) (777,424)
Interest on debentures (441,394) (385,009) (374,125)
Interest on finance leases (2,670) (4,991) (7,839)
Bank charges, financial transactions tax, and other charges (92,558) (91,614) (74,761)
Exchange variation, net of gains and losses with derivative instruments 172,701 72,869 (69,854)
Reversal of provision - ICMS from PIS and COFINS tax bases (see Note 21.a.1.2)   43,411  
Changes in subscription warranty-indemnification (see Note 24)   (20,360) (42,615)
TCC interest - Bahiana (see Notes 21.b.2.2 and 29)   (13,509)  
Interest of provisions, net, and other financial expenses 9,791 11,908 (9,201)
Financial expenses (794,771) (1,059,397) (1,355,819)
Financial income (expense) R$ (113,536) R$ (474,296) R$ (842,576)