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Equity - Balance of Other Comprehensive Income (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair value of cash flow hedging instruments [member]      
Summary of shareholders equity [line items]      
Beginning balance R$ (27,364) R$ (26,883) R$ 6,261
Changes in fair value of financial instruments (326,030) (2,550) (46,470)
Income and social contribution taxes on fair value 110,058 2,069 13,326
Ending balance (243,336) (27,364) (26,883)
Fair value of financial instruments [member]      
Summary of shareholders equity [line items]      
Beginning balance     1,523
Changes in fair value of financial instruments (273)   (1,523)
Ending balance (273)    
Actuarial gains (losses) of post-employment benefits [member]      
Summary of shareholders equity [line items]      
Beginning balance (15,181) 2,896 11,169
Actuarial losses of post-employment benefits (2,810) (27,658) (12,435)
Income and social contribution taxes on actuarial losses 242 9,581 4,162
Ending balance (17,749) (15,181) 2,896
Non-controlling shareholders interest change [member]      
Summary of shareholders equity [line items]      
Beginning balance 197,369    
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest   197,369  
Ending balance 197,369 197,369  
Total [member]      
Summary of shareholders equity [line items]      
Beginning balance 154,824 (23,987) 18,953
Changes in fair value of financial instruments (326,303) (2,550) (47,993)
Income and social contribution taxes on fair value 110,058 2,069 13,326
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 (2,810) (27,658) (12,435)
Income and social contribution taxes on actuarial losses 242 9,581 4,162
Ending balance R$ (63,989) R$ 154,824 R$ (23,987)