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Description of the business and summary of significant accounting policies - Foreign currency exchange differences and liabilities and provisions (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
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Dec. 31, 2017 $ / $ Q / $ | Dec. 31, 2017 $ / $ ₡ / $ | Dec. 31, 2017 USD ($) $ / $ | Dec. 31, 2017 MXN ($) $ / $ | Dec. 31, 2016 $ / $ Q / $ | Dec. 31, 2016 $ / $ ₡ / $ | Dec. 31, 2016 MXN ($) $ / $ | Dec. 31, 2015 MXN ($) | Apr. 25, 2018 $ / $ | Dec. 31, 2017 Q / $ | Dec. 31, 2017 ₡ / $ | Dec. 31, 2016 Q / $ | Dec. 31, 2016 ₡ / $
Description of the business and summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |
Average exchange rate for year | 7.3509 | 572.2000 |  |  | 7.4931 | 564.3332 |  |  |  |  |  |  |
Exchange rate as of end of the year | 19.7354 | 19.7354 | 19.7354 | 19.7354 | 20.6640 | 20.6640 | 20.6640 |  | 18.8628 | 7.3448 | 572.5600 | 7.5221 | 561.1000
Exchange differences on translation of foreign entities |  |  | $ 364 | $ 7,178 |  |  | $ 4,756 |  |  |  |  |  |
Cost of return of aircraft to lessors expensed as supplemental rent |  |  |  | $ 851,410 |  |  | $ 933,730 | $ 91,698 |  |  |  |  |

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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 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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- 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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- Definition The amount of other comprehensive income, net of tax, related to exchange differences when financial statements of foreign operations are translated. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of supplemental rent expense related to return of aircraft and engines. + References No definition available. + Details
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