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Risks and Financial Instruments - Credit risk exposure (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]    
Accounting balance R$ 4,996,662 R$ 4,938,613
Provision for losses 559,633 579,107
Current [member]    
Disclosure of detailed information about financial instruments [line items]    
Accounting balance 3,901,536 3,751,067
Provision for losses 23,476 44,091
Less than 30 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Accounting balance 109,284 134,836
Provision for losses 8,005 2,939
31 to 60 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Accounting balance 57,545 43,207
Provision for losses 11,746 3,563
61-90 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Accounting balance 39,177 42,589
Provision for losses 9,016 4,630
91-180 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Accounting balance 50,588 76,158
Provision for losses 24,818 28,062
More than 180 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Accounting balance 838,532 890,756
Provision for losses R$ 482,572 R$ 495,822
Weighted average [member] | Current [member]    
Disclosure of detailed information about financial instruments [line items]    
Expected credit loss rate 0.60% 1.20%
Weighted average [member] | Less than 30 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Expected credit loss rate 7.30% 2.20%
Weighted average [member] | 31 to 60 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Expected credit loss rate 20.40% 8.20%
Weighted average [member] | 61-90 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Expected credit loss rate 23.00% 10.90%
Weighted average [member] | 91-180 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Expected credit loss rate 49.10% 36.80%
Weighted average [member] | More than 180 days [member]    
Disclosure of detailed information about financial instruments [line items]    
Expected credit loss rate 57.50% 55.70%