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Provision for Asset Retirement Obligation - Fuel Tanks - Changes in the provision for asset retirement obligation (Detail) - Asset Retirement Obligation [member] - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Post Employment Benefits [line items]      
Beginning balance R$ 64,774 R$ 77,564 R$ 74,716
Additions (new tanks) 264 537 483
Expense with tanks removed (12,752) (15,432) (2,785)
Accretion expense 2,381 2,105 5,150
Ending Balance 54,667 R$ 64,774 R$ 77,564
Current 4,382    
Non-current R$ 50,285