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2. Presentation of Financial Statements and Summary of Significant Accounting Policies (Details 2) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfPresentationOfFinancialStatementsLineItems [Line Items]      
Current assets R$ 15,201,291 R$ 13,011,796  
Non-current assets 13,139,031 11,147,874  
Total assets 28,340,322 24,159,670  
Current liabilities 7,013,988 5,486,946  
Non-current liabilities 11,605,502 10,114,166  
Shareholder’s equity 9,720,832 8,558,558  
Total liabilities and shareholders' equity 28,340,322 24,159,670  
Net revenue from sales and services 80,007,422 77,352,955 R$ 75,655,274
Cost of products and services sold (72,735,781) (70,342,723) (68,933,702)
Selling and marketing expenses (2,885,311) (2,651,501) (2,516,561)
General and administrative expenses (1,576,528) (1,445,859) (1,321,341)
Financial result, net (474,296) (842,576) (703,338)
Income tax and social contribution 839,429 699,992 734,336
Net income for the year R$ 1,573,868 R$ 1,570,618 R$ 1,512,972
Earnings per share - basic R$ 2.9056 R$ 2.8844 R$ 2.7649
Earnings per share - diluted R$ 2.8847 R$ 2.8626 R$ 2.7433
IFRS 9 (1) adoption      
SummaryOfPresentationOfFinancialStatementsLineItems [Line Items]      
Current assets R$ (173,314)    
Non-current assets 0    
Total assets (173,314)    
Current liabilities 0    
Non-current liabilities (58,927)    
Shareholder’s equity (114,387)    
Total liabilities and shareholders' equity (173,314)    
Net revenue from sales and services 0    
Cost of products and services sold 0    
Selling and marketing expenses (51,751)    
General and administrative expenses 0    
Financial result, net 0    
Income tax and social contribution 17,595    
Net income for the year R$ (34,156)    
Earnings per share - basic R$ (0.063)    
Earnings per share - diluted R$ (0.0626)    
IFRS 15 (2) adoption      
SummaryOfPresentationOfFinancialStatementsLineItems [Line Items]      
Current assets R$ 0    
Non-current assets 0    
Total assets 0    
Current liabilities 0    
Non-current liabilities 0    
Shareholder’s equity 0    
Total liabilities and shareholders' equity 0    
Net revenue from sales and services (463,049)    
Cost of products and services sold 0    
Selling and marketing expenses 463,049    
General and administrative expenses 0    
Financial result, net 0    
Income tax and social contribution 0    
Net income for the year R$ 0    
Earnings per share - basic R$ 0    
Earnings per share - diluted R$ 0    
After adoption IFRS 9 and 15      
SummaryOfPresentationOfFinancialStatementsLineItems [Line Items]      
Current assets R$ 15,027,977    
Non-current assets 13,139,031    
Total assets 28,167,008    
Current liabilities 7,013,988    
Non-current liabilities 11,546,575    
Shareholder’s equity 9,606,445    
Total liabilities and shareholders' equity 28,167,008    
Net revenue from sales and services 79,544,373    
Cost of products and services sold (72,735,781)    
Selling and marketing expenses (2,474,013)    
General and administrative expenses (1,576,528)    
Financial result, net (474,296)    
Income tax and social contribution (821,834)    
Net income for the year R$ 1,539,712    
Earnings per share - basic R$ 2.8426    
Earnings per share - diluted R$ 2.8221