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Investment - Summary of Balances and Changes in Joint Ventures (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of joint ventures [line items]      
Joint ventures, beginning R$ 122,061 R$ 116,142 R$ 79,377
Capital increase 31,908 16,000 47,281
Valuation adjustments (3,704) 4,079 (2,935)
Dividends and interest on equity (gross) (32,065) (30,959) (12,915)
Share of profit (loss) of joint ventures (16,246) 16,799 5,334
Joint ventures, ending 101,954 122,061 116,142
Uniao vopak [member]      
Disclosure of joint ventures [line items]      
Joint ventures, beginning 6,096 4,518 4,545
Share of profit (loss) of joint ventures 1,350 1,578 (27)
Joint ventures, ending 7,446 6,096 4,518
Rpr [member]      
Disclosure of joint ventures [line items]      
Joint ventures, beginning 54,739 45,409 31,514
Valuation adjustments (3,704) 4,079 (2,935)
Dividends and interest on equity (gross) (32,065) (30,959) (12,915)
Share of profit (loss) of joint ventures 1,148 36,210 29,745
Joint ventures, ending 20,118 54,739 45,409
Connect car [member]      
Disclosure of joint ventures [line items]      
Joint ventures, beginning 61,226 66,215 43,318
Capital increase 31,908 16,000 47,281
Share of profit (loss) of joint ventures (18,744) (20,989) (24,384)
Joint ventures, ending R$ 74,390 R$ 61,226 R$ 66,215