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Income and Social Contribution Taxes - Summary of Changes in Balances of Deferred Taxes (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of deferred income and social contribution taxes [line items]      
Initial balance R$ 530,419 R$ 451,973  
IFRS 9 and 15 adoption 68,450 42,274 R$ 30,240
IRPJ and CSLL related to CBLSA goodwill - retrospective effect (45,118)    
Subtotal - Initial balance - restated 530,419 451,973 323,229
Deferred IRPJ and CSLL recognized in income of the year (162,417) 109,204 112,539
Deferred IRPJ and CSLL recognized in other comprehensive income 133,124 13,389 18,938
Deferred IRPJ and CSLL recognized in business combination 1,054 (45,728)  
Others 2,710 1,581 (2,733)
Final balance 504,890 530,419 451,973
Previously stated [member]      
Disclosure of deferred income and social contribution taxes [line items]      
Initial balance R$ 507,087 409,699 292,989
Final balance   R$ 507,087 R$ 409,699