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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, 2018
$ / $
Q / $
Dec. 31, 2018
$ / $
₡ / $
Dec. 31, 2018
USD ($)
$ / $
Dec. 31, 2018
MXN ($)
$ / $
Dec. 31, 2017
$ / $
Q / $
Dec. 31, 2017
$ / $
₡ / $
Dec. 31, 2017
MXN ($)
$ / $
Dec. 31, 2016
$ / $
Q / $
Dec. 31, 2016
$ / $
₡ / $
Dec. 31, 2016
MXN ($)
$ / $
Apr. 25, 2019
$ / $
Dec. 31, 2018
Q / $
Dec. 31, 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 7.5337 580.8534     7.3509 572.2000   7.4931 564.3332                
Exchange rate as of end of the year 19.6829 19.6829 19.6829 19.6829 19.7354 19.7354 19.7354 20.6640 20.6640 20.6640 18.9578 7.7440 609.6100 7.3448 572.5600 7.5221 561.1000
Exchange differences on translation of foreign operations     $ 1,126 $ 22,156     $ (7,178)     $ (4,756)              
Cost of return of aircraft to lessors expensed as supplemental rent       $ 659,106     $ 851,410     $ 933,730