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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Post Employment Benefits [line items]      
Beginning balance R$ 51,242 R$ 54,667 R$ 64,774
Additions (new tanks) 163 290 264
Expenditure with tanks removed (4,306) (5,456) (12,752)
Accretion expense 6,336 1,741 2,381
Ending Balance 53,435 R$ 51,242 R$ 54,667
Current 4,267    
Non-current R$ 49,168