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Equity - Balance of Other Comprehensive Income (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value of cash flow hedging instruments [member]      
Summary of shareholders equity [line items]      
Beginning balance R$ (296,132) R$ (243,336) R$ (27,364)
Changes in fair value of financial instruments (477,570) (76,479) (326,030)
IRPJ and CSLL on fair value 164,425 23,683 110,058
Actuarial losses of post-employment benefits 0 0 0
Income and social contribution taxes on actuarial losses 0 0 0
Ending balance (609,277) (296,132) (243,336)
Fair value of financial instruments [member]      
Summary of shareholders equity [line items]      
Beginning balance 205 (273) 0
Changes in fair value of financial instruments 64 478 (273)
IRPJ and CSLL on fair value 0 0 0
Actuarial losses of post-employment benefits 0 0 0
Income and social contribution taxes on actuarial losses 0 0 0
Ending balance 269 205 (273)
Actuarial gains (losses) of post-employment benefits [member]      
Summary of shareholders equity [line items]      
Beginning balance (47,759) (17,749) (15,181)
Changes in fair value of financial instruments 0 0 0
IRPJ and CSLL on fair value 0 0 0
Actuarial losses of post-employment benefits (7,725) (41,794) (2,810)
Income and social contribution taxes on actuarial losses 2,133 11,784 242
Ending balance (53,351) (47,759) (17,749)
Non-controlling shareholders interest change [member]      
Summary of shareholders equity [line items]      
Beginning balance 197,369 197,369 197,369
Changes in fair value of financial instruments 0 0 0
IRPJ and CSLL on fair value 0 0 0
Actuarial losses of post-employment benefits 0 0 0
Income and social contribution taxes on actuarial losses 0 0 0
Ending balance 197,369 197,369 197,369
Total [member]      
Summary of shareholders equity [line items]      
Beginning balance (146,317) (63,989) 154,824
Changes in fair value of financial instruments (477,507) (76,001) (326,303)
IRPJ and CSLL on fair value 164,425 23,683 110,058
Actuarial losses of post-employment benefits (7,724) (41,794) (2,810)
Income and social contribution taxes on actuarial losses 2,133 11,784 242
Ending balance R$ (464,990) R$ (146,317) R$ (63,989)