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Fair Value of Financial Instruments - Summary of Sensitivity Analyses Operations of Level 3 (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Interest rate risk [Member] | Scenarios I [Member]    
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items]    
Impact, Result R$ (0.4) R$ (1.9)
Impact, Stockholders' equity (1.2) (2.4)
Interest rate risk [Member] | Scenarios II [Member]    
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items]    
Impact, Result (9.3) (47.0)
Impact, Stockholders' equity (29.3) (55.4)
Interest rate risk [Member] | Scenarios III [Member]    
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items]    
Impact, Result (18.6) (93.9)
Impact, Stockholders' equity (57.8) (114.5)
Shares [member] | Scenarios I [Member]    
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items]    
Impact, Result (63.4) (146.6)
Shares [member] | Scenarios II [Member]    
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items]    
Impact, Result (126.8) (293.2)
Nonlinear [Member] | Scenarios I [Member]    
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items]    
Impact, Result (48.2) (9.2)
Nonlinear [Member] | Scenarios II [Member]    
Disclosure of Fair Value Financial Sensitivity Analysis [Line Items]    
Impact, Result R$ (89.3) R$ (11.9)