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Significant Accounting Policies - Disclosure of Exchange Rates of Local Currencies Translated to Mexican Pesos (Detail) | 12 Months Ended
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Dec. 31, 2018 $ / $ | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of significant accounting policies [line items] |  |  |
Exchange Rate as of | 19.6350 |  |
Guatemala [member] | Guatemala, Quetzal [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Quetzal |  |
Average Exchange Rate for | 2.56 | 2.57 | 2.46
Exchange Rate as of | 2.54 | 2.69 |
Costa Rica [member] | Costa Rica, Colon [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Colon |  |
Average Exchange Rate for | 0.03 | 0.03 | 0.03
Exchange Rate as of | 0.03 | 0.03 |
Panama [member] | U S dollar [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | U.S. dollar |  |
Average Exchange Rate for | 19.24 | 18.93 | 18.66
Exchange Rate as of | 19.68 | 19.74 |
Colombia [member] | Colombian peso [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Colombian peso |  |
Average Exchange Rate for | 0.01 | 0.01 | 0.01
Exchange Rate as of | 0.01 | 0.01 |
Nicaragua [member] | Nicaragua, Cordoba [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Cordoba |  |
Average Exchange Rate for | 0.62 | 0.63 | 0.65
Exchange Rate as of | 0.61 | 0.64 |
Argentina [member] | Argentine peso [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Argentine peso |  |
Average Exchange Rate for | 0.73 | 1.15 | 1.26
Exchange Rate as of | 0.52 | 1.06 |
Venezuela [member] | Venezuelan bolivar fuerte [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Bolivar |  |
Brazil [member] | Brazilian reais [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Reais |  |
Average Exchange Rate for | 5.29 | 5.94 | 5.39
Exchange Rate as of | 5.08 | 5.97 |
Chile [member] | Chilean peso [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Chilean peso |  |
Average Exchange Rate for | 0.03 | 0.03 | 0.03
Exchange Rate as of | 0.03 | 0.03 |
Euro Zone [member] | Euro [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Euro (€) |  |
Average Exchange Rate for | 22.71 | 21.32 | 20.66
Exchange Rate as of | 22.54 | 23.57 |
Peru [member] | Peru, Nuevo Sol [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Nuevo Sol |  |
Average Exchange Rate for | 5.85 | 5.78 | 5.53
Exchange Rate as of | 5.83 | 6.08 |
Ecuador [member] | U S dollar [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | U.S. dollar |  |
Average Exchange Rate for | 19.24 | 18.93 | 18.66
Exchange Rate as of | 19.68 | 19.74 |
Philippines [member] | Philippine peso [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Philippine peso |  |
Average Exchange Rate for | 0.37 | 0.38 | 0.39
Exchange Rate as of | 0.37 | 0.40 |
Uruguay [member] | Uruguay Peso en Unidades Indexadas (UPUI) [member] |  |  |
Disclosure of significant accounting policies [line items] |  |  |
Functional / Recording Currency | Uruguayan peso |  |
Average Exchange Rate for | 0.63 | 0.66 | 0.71
Exchange Rate as of | 0.61 | 0.69 |

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + 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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