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11. Investments (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfJointVenturesLineItems [Line Items]      
Joint ventures, beginning R$ 116,142 R$ 79,377 R$ 54,508
Capital increase 16,000 47,281 37,080
Advance for Future Capital Increase     4,000
Valuation adjustments 4,079 (2,935) 1,535
Share of profit (loss) of joint ventures 16,799 5,334 (14,287)
Dividends (30,959) (12,915) (3,459)
Joint ventures, ending 122,061 116,142 79,377
Uniao Vopak      
SummaryOfJointVenturesLineItems [Line Items]      
Joint ventures, beginning 4,518 4,545 4,960
Capital increase 0 0 0
Advance for Future Capital Increase     0
Valuation adjustments 0 0 0
Share of profit (loss) of joint ventures 1,578 (27) 699
Dividends 0 0 (1,114)
Joint ventures, ending 6,096 4,518 4,545
RPR      
SummaryOfJointVenturesLineItems [Line Items]      
Joint ventures, beginning 45,409 31,514 24,076
Capital increase 0 0 0
Advance for Future Capital Increase     0
Valuation adjustments 4,079 (2,935) 1,535
Share of profit (loss) of joint ventures 36,210 29,745 8,248
Dividends (30,959) (12,915) (2,345)
Joint ventures, ending 54,739 45,409 31,514
Connect Car      
SummaryOfJointVenturesLineItems [Line Items]      
Joint ventures, beginning 66,215 43,318 25,472
Capital increase 16,000 47,281 37,080
Advance for Future Capital Increase     4,000
Valuation adjustments 0 0 0
Share of profit (loss) of joint ventures (20,989) (24,384) (23,234)
Dividends 0 0 0
Joint ventures, ending R$ 61,226 R$ 66,215 R$ 43,318