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Summary of significant accounting policies (Details Textual) | 12 Months Ended
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Dec. 31, 2017
Credit Insurance Coverage Deduction Rate | 10.00%
Description of other information used to assess credit quality | until reaching 100% of the balance in most of the debts older than 180 days, with the exception of those cases that in accordance with current policies, losses are estimated due to partial deterioration based on a case by case analysis. Impairment losses are recorded in the Consolidated Statemet of Income in the period incurred.
Description of how entity determines economic relationship between hedged item and hedging instrument for purpose of assessing hedge effectiveness | A hedge is considered effective when changes in the cash flows of the underlying directly attributable to the risk hedged are offset with the changes in fair value, or in the cash flows of the hedging instrument with effectiveness between 80% to 125%.
Domestic Market [Member] | Trade receivables [member] |
Credit Insurance Coverage Rate For Accounts Receivables | 90.00%
International Market [Member] | Trade receivables [member] |
Credit Insurance Coverage Rate For Accounts Receivables | 99.00%

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- Definition Represents the credit insurance coverage rate for accounts receivables. + References No definition available. + Details
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- Definition The description of how the entity determines the economic relationship between the hedged item and the hedging instrument for the purpose of assessing the hedge effectiveness. Hedge effectiveness is the extent to which changes in the fair value or the cash flows of the hedging instrument offset changes in the fair value or the cash flows of the hedged item. [Refer: Hedging instruments [member]; Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 22B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_22B_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The description of the information used to assess the credit quality of financial assets with credit risk that are neither past due nor impaired that the entity does not separately disclose. [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph IG23 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_IG23_d&doctype=Implementation%20Guidance&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 36 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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