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Income and Social Contribution Taxes - Summary of Reconciliation of Taxes (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income and social contribution taxes details 4 [abstract] |  |  |
Income (loss) before taxes and share of profit (loss) of joint ventures, and associates | R$ 1,785,818 | R$ 2,318,446 | R$ 2,227,298
Statutory tax rates | 34.00% | 34.00% | 34.00%
Income and social contribution taxes at the statutory tax rates | R$ (607,178) | R$ (788,272) | R$ (757,281)
Adjustments to the statutory income and social contribution taxes: |  |  |
Nondeductible expenses | (82,784) | (105,017) | (57,961)
Nontaxable revenues | 32,523 | 19,084 | 7,561
Adjustment to estimated income | 9,706 | 10,844 | 14,218
Interest on equity | (538) | (550) | (364)
Unrecorded deferred Income and Social Contribution Taxes Carryforwards deferred | (95,480) |  |
Other adjustments | (2,634) | 2,059 | 6,957
Income and social contribution taxes before tax incentives | (746,385) | (861,852) | (786,870)
Tax incentives-SUDENE | 107,666 | 48,598 | 98,912
Income and social contribution taxes in the income statement | (638,719) | (813,254) | (687,958)
Current | (476,302) | (922,458) | (800,497)
Deferred | (162,417) | 109,204 | 112,539
Income and social contribution taxes in the income statement | R$ (638,719) | R$ (813,254) | R$ (687,958)
Effective IRPJ and CSLL rates | 35.80% | 35.10% | 30.90%

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- Definition Adjustments for income tax expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_35&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of tax expense exclusive of income tax expense. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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