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8. Related Parties (Details 2)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
shares
R$ / shares
SummaryOfRelatedPartiesLineItems [Line Items]  
Total grants costs, including taxes R$ 105,521
Accumulated recognized grant costs (62,002)
Accumulated unrecognized grant costs R$ 43,519
Sharebased Payment Arrangements 1  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 13-Mar-17
Balance of number of shares granted | shares 100,000
Vesting period 2022 to 2024
Market price of shares on the grant date | R$ / shares R$ 67.99
Total grants costs, including taxes R$ 9,378
Accumulated recognized grant costs (1,327)
Accumulated unrecognized grant costs R$ 8,051
Sharebased Payment Arrangements 2  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 4-Mar-16
Balance of number of shares granted | shares 190,000
Vesting period 2021 to 2023
Market price of shares on the grant date | R$ / shares R$ 65.43
Total grants costs, including taxes R$ 17,147
Accumulated recognized grant costs (5,339)
Accumulated unrecognized grant costs R$ 11,808
Sharebased Payment Arrangements 3  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 9-Dec-14
Balance of number of shares granted | shares 570,000
Vesting period 2019 to 2021
Market price of shares on the grant date | R$ / shares R$ 50.64
Total grants costs, including taxes R$ 39,814
Accumulated recognized grant costs (20,849)
Accumulated unrecognized grant costs R$ 18,965
Sharebased Payment Arrangements 4  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 5-Mar-14
Balance of number of shares granted | shares 83,400
Vesting period 2019 to 2021
Market price of shares on the grant date | R$ / shares R$ 52.15
Total grants costs, including taxes R$ 5,999
Accumulated recognized grant costs (3,906)
Accumulated unrecognized grant costs R$ 2,093
Sharebased Payment Arrangements 5  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 7-Nov-12
Balance of number of shares granted | shares 199,998
Vesting period 2017 to 2019
Market price of shares on the grant date | R$ / shares R$ 42.9
Total grants costs, including taxes R$ 18,309
Accumulated recognized grant costs (15,937)
Accumulated unrecognized grant costs R$ 2,372
Sharebased Payment Arrangements 6  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 14-Dec-11
Balance of number of shares granted | shares 40,000
Vesting period 2016 to 2018
Market price of shares on the grant date | R$ / shares R$ 31.85
Total grants costs, including taxes R$ 5,272
Accumulated recognized grant costs (5,042)
Accumulated unrecognized grant costs R$ 230
Sharebased Payment Arrangements 7  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 10-Nov-10
Balance of number of shares granted | shares 0
Vesting period 2015 to 2017
Market price of shares on the grant date | R$ / shares R$ 26.78
Total grants costs, including taxes R$ 9,602
Accumulated recognized grant costs (9,602)
Accumulated unrecognized grant costs R$ 0