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23. Shareholders' Equity (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair value of cash flow hedging instruments      
SummaryOfShareholdersEquityLineItems [Line Items]      
Beginning balance R$ (26,883) R$ 6,261 R$ 0
Translation of foreign subsidiaries, including the exchange rate effect of net investments hedge 0 0 0
Changes in fair value (2,550) (46,470) 6,261
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest 0    
Income and social contribution taxes on fair value 2,069 13,326  
Actuarial gains (losses) of post-employment benefits 0 0 0
Income and social contribution taxes on actuarial losses 0 0 0
Ending balance (27,634) (26,883) 6,261
Fair value of financial instruments classified as available for sale      
SummaryOfShareholdersEquityLineItems [Line Items]      
Beginning balance 0 1,523 51
Translation of foreign subsidiaries, including the exchange rate effect of net investments hedge 0 0 0
Changes in fair value 0 (1,523) 1,472
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest 0    
Income and social contribution taxes on fair value 0 0  
Actuarial gains (losses) of post-employment benefits 0 0 0
Income and social contribution taxes on actuarial losses 0 0 0
Ending balance 0 0 1,523
Actuarial gains (losses) of post-employment benefits      
SummaryOfShareholdersEquityLineItems [Line Items]      
Beginning balance 2,896 11,169 7,098
Translation of foreign subsidiaries, including the exchange rate effect of net investments hedge 0 0 0
Changes in fair value 0 0 0
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest 0    
Income and social contribution taxes on fair value 0 0  
Actuarial gains (losses) of post-employment benefits (27,658) (12,435) 6,321
Income and social contribution taxes on actuarial losses 9,581 4,162 (2,250)
Ending balance (15,181) 2,896 11,169
Non-controlling shareholders interest change      
SummaryOfShareholdersEquityLineItems [Line Items]      
Beginning balance 0    
Translation of foreign subsidiaries, including the exchange rate effect of net investments hedge 0    
Changes in fair value 0    
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest 202,188    
Income and social contribution taxes on fair value 0    
Actuarial gains (losses) of post-employment benefits 0    
Income and social contribution taxes on actuarial losses 0    
Ending balance 202,188 0  
Total      
SummaryOfShareholdersEquityLineItems [Line Items]      
Beginning balance (23,987) 18,953 7,149
Translation of foreign subsidiaries, including the exchange rate effect of net investments hedge 0 0 0
Changes in fair value (2,550) (47,993) 7,733
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest 202,188    
Income and social contribution taxes on fair value 2,069 13,326  
Actuarial gains (losses) of post-employment benefits (27,658) (12,435) 6,321
Income and social contribution taxes on actuarial losses 9,581 4,162 (2,250)
Ending balance 159,643 (23,987) 18,953
Cumulative translation adjustment      
SummaryOfShareholdersEquityLineItems [Line Items]      
Beginning balance 7,519 66,925 43,192
Translation of foreign subsidiaries, including the exchange rate effect of net investments hedge 45,542 (59,406) 23,733
Changes in fair value 0 0 0
Difference between the fair value of the consideration received or paid and the variation in the non-controlling shareholders interest 0    
Income and social contribution taxes on fair value 0 0  
Actuarial gains (losses) of post-employment benefits 0 0 0
Income and social contribution taxes on actuarial losses 0 0 0
Ending balance R$ 53,061 R$ 7,519 R$ 66,925