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Income Taxes - Summary of Reconciliation of Income Tax Expense to Profit (Loss) (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Profit (loss) before income taxes R$ 1,090,655 R$ 442,339 R$ (95,665)
Brazilian statutory rate 34.00% 34.00% 34.00%
Tax (expense) benefit at the statutory rate R$ (370,823) R$ (150,395) R$ 32,526
Additions (exclusions):      
Gain from entities not subject to the payment of income taxes 47,782 (3,283) (37,098)
Interest on capital 10,102    
Other permanent differences 6,039 (2,871) (3,805)
Equity pickup on associates (275) 169 105
Unrecorded deferred taxes (2,030) (652) (1,332)
Use of tax losses previously unrecorded 5,163 2,689 218
Unrealized gain on previously held interest on acquisition   7,290  
Tax incentives 5,666 3,300  
Research and development tax benefit 8,188 4,026  
Other tax incentives 3,728 2,615 82
Total income tax and social contribution (expense) gain R$ (286,460) R$ (137,112) R$ (9,304)
Effective tax rate 26.00% 31.00% (10.00%)
Current income tax and social contribution R$ (217,228) R$ (154,882) R$ (5,682)
Deferred income tax and social contribution (69,232) 17,770 (3,622)
Total income tax and social contribution (expense) gain R$ (286,460) R$ (137,112) R$ (9,304)