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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
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