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Related Parties - Summary of Shares granted (Detail)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
R$ / shares
Summary of related parties [line items]  
Balance of number of shares granted 850,064
Total grant costs, including taxes R$ 81,434
Accumulated recognized grant costs (55,904)
Accumulated unrecognized grant costs R$ 25,530
Sharebased payment arrangements 1 [member]  
Summary of related parties [line items]  
Grant date Mar. 13, 2017
Balance of number of shares granted 100,000
Vesting period 2022 to 2024
Market price of shares on the grant date | R$ / shares R$ 67,990
Total grant costs, including taxes R$ 9,378
Accumulated recognized grant costs (2,920)
Accumulated unrecognized grant costs R$ 6,458
Sharebased payment arrangements 2 [member]  
Summary of related parties [line items]  
Grant date Mar. 04, 2016
Balance of number of shares granted 190,000
Vesting period 2021 to 2023
Market price of shares on the grant date | R$ / shares R$ 65,430
Total grant costs, including taxes R$ 17,147
Accumulated recognized grant costs (8,252)
Accumulated unrecognized grant costs R$ 8,895
Sharebased payment arrangements 3 [member]  
Summary of related parties [line items]  
Grant date Dec. 09, 2014
Balance of number of shares granted 400,000
Vesting period 2019 to 2021
Market price of shares on the grant date | R$ / shares R$ 50,640
Total grant costs, including taxes R$ 27,939
Accumulated recognized grant costs (19,376)
Accumulated unrecognized grant costs R$ 8,563
Sharebased payment arrangements 4 [member]  
Summary of related parties [line items]  
Grant date Mar. 05, 2014
Balance of number of shares granted 83,400
Vesting period 2019 to 2021
Market price of shares on the grant date | R$ / shares R$ 52,150
Total grant costs, including taxes R$ 5,999
Accumulated recognized grant costs (4,925)
Accumulated unrecognized grant costs R$ 1,074
Sharebased payment arrangements 5 [member]  
Summary of related parties [line items]  
Grant date Nov. 07, 2012
Balance of number of shares granted 76,664
Vesting period 2017 to 2019
Market price of shares on the grant date | R$ / shares R$ 42,900
Total grant costs, including taxes R$ 16,139
Accumulated recognized grant costs (15,599)
Accumulated unrecognized grant costs R$ 540
Sharebased payment arrangements 6 [member]  
Summary of related parties [line items]  
Grant date Dec. 14, 2011
Vesting period 2016 to 2018
Market price of shares on the grant date | R$ / shares R$ 31,850
Total grant costs, including taxes R$ 4,832
Accumulated recognized grant costs R$ (4,832)