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Equity - Balance of Other Comprehensive Income (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair value of cash flow hedging instruments [member]      
Summary of shareholders equity [line items]      
Beginning balance R$ (243,336) R$ (27,364) R$ (26,883)
Changes in fair value of financial instruments (76,479) (326,030) (2,550)
Income and social contribution taxes on fair value 23,683 110,058 2,069
Actuarial losses of post-employment benefits 0    
Income and social contribution taxes on actuarial losses 0    
Ending balance (296,132) (243,336) (27,364)
Fair value of financial instruments [member]      
Summary of shareholders equity [line items]      
Beginning balance (273)    
Changes in fair value of financial instruments 478 (273)  
Income and social contribution taxes on fair value 0    
Actuarial losses of post-employment benefits 0    
Income and social contribution taxes on actuarial losses 0    
Ending balance 205 (273)  
Actuarial gains (losses) of post-employment benefits [member]      
Summary of shareholders equity [line items]      
Beginning balance (17,749) (15,181) 2,896
Changes in fair value of financial instruments 0    
Income and social contribution taxes on fair value 0    
Actuarial losses of post-employment benefits (41,794) (2,810) (27,658)
Income and social contribution taxes on actuarial losses 11,784 242 9,581
Ending balance (47,759) (17,749) (15,181)
Non-controlling shareholders interest change [member]      
Summary of shareholders equity [line items]      
Beginning balance 197,369 197,369  
Changes in fair value of financial instruments 0    
Income and social contribution taxes on fair value 0    
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest     197,369
Actuarial losses of post-employment benefits 0    
Income and social contribution taxes on actuarial losses 0    
Ending balance 197,369 197,369 197,369
Total [member]      
Summary of shareholders equity [line items]      
Beginning balance (63,989) 154,824 (23,987)
Changes in fair value of financial instruments (76,001) (326,303) (2,550)
Income and social contribution taxes on fair value 23,683 110,058 2,069
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest     197,369
Actuarial losses of post-employment benefits (41,794) (2,810) (27,658)
Income and social contribution taxes on actuarial losses 11,784 242 9,581
Ending balance R$ (146,317) R$ (63,989) R$ 154,824