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Presentation of Financial Statements and Summary of Significant Accounting Policies - Summary of Impacts of Adoption - Statements of Profit or Loss (Detail) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Net revenue from sales and services | R$ 90,697,983 | R$ 79,230,014 | R$ 76,740,033
Cost of products and services sold | (84,537,368) | (72,431,473) | (70,196,945)
Gross profit | 6,160,615 | 6,798,541 | 6,543,088
Operating income (expenses) |  |  |
Selling and marketing | (2,670,867) | (2,486,389) | (2,220,193)
Other operating income (expenses) items | 57,533 | 59,360 | 198,972
Operating income before financial income (expenses) and share of profit (loss) of joint ventures and associates | 1,899,354 | 2,792,742 | 3,069,874
Financial result, net | (681,235) | (585,101) | (513,243)
Share of profit of joint ventures and associates | (14,779) | 20,673 | 7,476
Income before income and social contribution taxes | 1,771,039 | 2,339,119 | 2,234,774
Income and social contribution taxes |  |  |
Current | (476,302) | (922,458) | (800,497)
Deferred | (162,417) | 109,204 | 112,539
Net income for the year | 1,132,320 | 1,525,865 | 1,546,816
Net income for the year attributable to: |  |  |
Shareholders of the Company | 1,150,421 | 1,526,505 | 1,537,837
Non-controlling interests in subsidiaries | (18,101) | (640) | 8,979
Net income for the year | R$ 1,132,320 | R$ 1,525,865 | R$ 1,546,816
Earnings per share (based on weighted average number of shares outstanding) - |  |  |
Basic | R$ 1.0611 | R$ 1.4084 | R$ 1.4203
Diluted | R$ 1.0541 | R$ 1.3984 | R$ 1.4095
Effect of overlay approach reclassification [member] |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Net revenue from sales and services |  | R$ (302,780) | R$ (141,807)
Cost of products and services sold |  | 302,780 | 141,807
Previously stated [member] |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Net revenue from sales and services |  | 80,007,422 | 77,352,955
Cost of products and services sold |  | (72,735,781) | (70,342,723)
Gross profit |  | 7,271,641 | 7,010,232
Operating income (expenses) |  |  |
Selling and marketing |  | (2,885,311) | (2,651,501)
Other operating income (expenses) items |  | (1,519,410) | (1,253,021)
Operating income before financial income (expenses) and share of profit (loss) of joint ventures and associates |  | 2,866,920 | 3,105,710
Financial result, net |  | (474,296) | (842,576)
Share of profit of joint ventures and associates |  | 20,673 | 7,476
Income before income and social contribution taxes |  | 2,413,297 | 2,270,610
Income and social contribution taxes |  |  |
Current |  | (922,458) | (800,497)
Deferred |  | 83,029 | 100,505
Tax expense (income) |  | (839,429) | (699,992)
Net income for the year |  | 1,573,868 | 1,570,618
Net income for the year attributable to: |  |  |
Shareholders of the Company |  | 1,574,306 | 1,561,585
Non-controlling interests in subsidiaries |  | (438) | 9,033
Net income for the year |  | R$ 1,573,868 | R$ 1,570,618
Earnings per share (based on weighted average number of shares outstanding) - |  |  |
Basic |  | R$ 1.4528 | R$ 1.4422
Diluted |  | R$ 1.4423 | R$ 1.4313
Increase (decrease) due to changes in accounting policy [member] | IFRS9 [member] |  |  |
Operating income (expenses) |  |  |
Selling and marketing |  | R$ (72,485) | R$ (44,074)
Operating income before financial income (expenses) and share of profit (loss) of joint ventures and associates |  | (72,485) | (44,074)
Income before income and social contribution taxes |  | (72,485) | (44,074)
Income and social contribution taxes |  |  |
Deferred |  | 25,599 | 14,835
Tax expense (income) |  | 25,599 | 14,835
Net income for the year |  | (46,886) | (29,239)
Net income for the year attributable to: |  |  |
Shareholders of the Company |  | (46,825) | (29,189)
Non-controlling interests in subsidiaries |  | (61) | (50)
Net income for the year |  | (46,886) | (29,239)
Increase (decrease) due to changes in accounting policy [member] | IFRS 15 [member] |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Net revenue from sales and services |  | (474,628) | (471,115)
Cost of products and services sold |  | 1,528 | 3,971
Gross profit |  | (473,100) | (467,144)
Operating income (expenses) |  |  |
Selling and marketing |  | 471,407 | 475,382
Operating income before financial income (expenses) and share of profit (loss) of joint ventures and associates |  | (1,693) | 8,238
Income before income and social contribution taxes |  | (1,693) | 8,238
Income and social contribution taxes |  |  |
Deferred |  | 576 | (2,801)
Tax expense (income) |  | 576 | (2,801)
Net income for the year |  | (1,117) | 5,437
Net income for the year attributable to: |  |  |
Shareholders of the Company |  | (976) | 5,441
Non-controlling interests in subsidiaries |  | (141) | (4)
Net income for the year |  | (1,117) | 5,437
After adoption IFRS 9 and 15 [member] |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Net revenue from sales and services |  | 79,230,014 | 76,740,033
Cost of products and services sold |  | (72,431,473) | (70,196,945)
Gross profit |  | 6,798,541 | 6,543,088
Operating income (expenses) |  |  |
Selling and marketing |  | (2,486,389) | (2,220,193)
Other operating income (expenses) items |  | (1,519,410) | (1,253,021)
Operating income before financial income (expenses) and share of profit (loss) of joint ventures and associates |  | 2,792,742 | 3,069,874
Financial result, net |  | (474,296) | (842,576)
Share of profit of joint ventures and associates |  | 20,673 | 7,476
Income before income and social contribution taxes |  | 2,339,119 | 2,234,774
Income and social contribution taxes |  |  |
Current |  | (922,458) | (800,497)
Deferred |  | 109,204 | 112,539
Tax expense (income) |  | (813,254) | (687,958)
Net income for the year |  | 1,525,865 | 1,546,816
Net income for the year attributable to: |  |  |
Shareholders of the Company |  | 1,526,505 | 1,537,837
Non-controlling interests in subsidiaries |  | (640) | 8,979
Net income for the year |  | R$ 1,525,865 | R$ 1,546,816
Earnings per share (based on weighted average number of shares outstanding) - |  |  |
Basic |  | R$ 1.4084 | R$ 1.4203
Diluted |  | R$ 1.3984 | R$ 1.4095

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