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Foreign Currency Transactions - Summary of Exchange Rate in Effect (Detail) | Feb. 20, 2019 Exchange_Rate | Dec. 31, 2018 Exchange_Rate | Jun. 12, 2018 $ / $ | Dec. 31, 2017 Exchange_Rate | Mar. 23, 2017 $ / $ | Dec. 31, 2016 Exchange_Rate
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Foreign currency transactions [Line Items] |  |  |  |  |  |
Mexican pesos per one U.S. dollar |  | 19.6829 | 19.0115 | 19.7354 | 19.4942 | 20.6640
Exchange rates in effect [Member] |  |  |  |  |  |
Foreign currency transactions [Line Items] |  |  |  |  |  |
Mexican pesos per one U.S. dollar | 19.2578 |  |  |  |  |

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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 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Foreign currency transactions. + References No definition available. + Details
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