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Fair value measurements - Loss gain from financial instruments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / $
Dec. 31, 2019
MXN ($)
$ / $
Dec. 31, 2018
MXN ($)
$ / $
Dec. 31, 2017
MXN ($)
$ / $
Apr. 27, 2020
$ / $
Dec. 31, 2019
Q / $
Dec. 31, 2019
₡ / $
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Q / $
Dec. 31, 2018
₡ / $
Dec. 31, 2017
Q / $
Dec. 31, 2017
₡ / $
gain (loss) on financial instruments                        
Loss from derivatives financial instruments recognized in consolidated statements of operations   $ (67,629) $ 455,009 $ (52,097)                
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income $ 13,982,000 $ 263,495 $ (283,691) $ (42,148)                
Exchange rate 18.8452 18.8452 19.6829 19.7354 24.6230 7.6988 573.4400 18.8452 7.7440 609.6100 7.3448 572.5600
Foreign currency forward contract                        
gain (loss) on financial instruments                        
Loss from derivatives financial instruments recognized in consolidated statements of operations   $ 4,199 $ 52,516 $ (11,290)                
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   (14,241) 14,241 (2,090)                
Jet fuel Asian call options                        
gain (loss) on financial instruments                        
Loss from derivatives financial instruments recognized in consolidated statements of operations   (61,069) 402,493 (26,980)                
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   11,148 (174,984) (54,202)                
Jet fuel Zero cost collars                        
gain (loss) on financial instruments                        
Loss from derivatives financial instruments recognized in consolidated statements of operations   (9,477)                    
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   256,515 $ (122,948)                  
Interest rate swap contracts                        
gain (loss) on financial instruments                        
Loss from derivatives financial instruments recognized in consolidated statements of operations       (13,827)                
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income       $ 14,144                
Loss of the interest rate Cap                        
gain (loss) on financial instruments                        
Loss from derivatives financial instruments recognized in consolidated statements of operations   (1,282)                    
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   (4,023)                    
Derivative financial instruments                        
gain (loss) on financial instruments                        
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income   $ 14,096