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Balances and Transactions in Foreign Currencies - Summary of Exchange Rates (Detail) | Apr. 20, 2018 $ / EUR $ / $ | Dec. 31, 2017 $ / EUR $ / $ | Dec. 31, 2016 $ / EUR $ / $
--- | --- | --- | ---
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate |  | 19.6395 |
U.S. dollars [member] |  |  |
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate |  | 19.7354 | 20.6640
Euro [member] |  |  |
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate | $ / EUR |  | 23.5729 | 21.7741
Changes in foreign exchange rates [member] |  |  |
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate | 18.6145 |  |
Changes in foreign exchange rates [member] | U.S. dollars [member] |  |  |
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate | 18.0333 |  |
Changes in foreign exchange rates [member] | Euro [member] |  |  |
Disclosure of exchange rates [Line Items] |  |  |
Closing foreign exchange rate | $ / EUR | 22.9066 |  |

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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