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Post-employment Benefits - Summary of Defined Benefit Obligation and Fair Value of Plan Assets (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost R$ 487 R$ 540 R$ 480
Interest on actuarial obligation 52,490 45,567 45,601
Actuarial (gain) loss arising from financial assumptions 183,156 58,250 (211,030)
Actuarial loss (gain) arising from experience adjustment (77,112) (30,267) 1,216
Actuarial loss arising from demographic assumptions (14)
Employer contributions (217) (214) (215)
Net defined benefit liability 669,285 728,548 704,642
Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 1,249,156 1,249,630 1,012,792
Current service cost 487 540 480
Interest on actuarial obligation 88,299 89,253 91,849
Actuarial (gain) loss arising from financial assumptions (183,159) (58,250) 211,030
Actuarial loss (gain) arising from experience adjustment 77,111 30,267 (1,216)
Actuarial loss arising from demographic assumptions 14
Benefit payments (70,201) (62,298) (65,305)
Ending balance 1,161,693 1,249,156 1,249,630
Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (520,608) (544,988) (433,174)
Interest on actuarial obligation (35,809) (38,452) (39,299)
Return on investments in the year (excluding interest income) 24,143 34,370 (105,417)
Employer contributions (30,336) (33,836) (32,403)
Benefit payments 70,202 62,298 65,305
Ending balance R$ (492,408) R$ (520,608) R$ (544,988)