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Fair value measurements - Carrying amount and fair value (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair value measurements      
Carrying amount of derivative financial assets $ 62,440 $ 497,403 $ 867,809
Fair value of derivative financial assets 62,440 497,403 867,809
Net carrying amount (3,567,342) (2,979,339) (1,134,516)
Net fair value (3,576,058) (2,984,338) (1,134,780)
Transfers of assets from level 1 to level 2 0 0 0
Transfers of assets from level 2 to level 1 0 0 0
Transfers of liabilities from level 1 to level 2 0 0 0
Transfers of liabilities from level 2 to level 1 0 0 0
Financial debt      
Fair value measurements      
Carrying amount of financial liabilities (3,506,834) (3,476,742) (1,988,181)
Fair value of financial liabilities (3,515,550) (3,481,741) (1,988,445)
Interest-bearing loans and borrowings      
Fair value measurements      
Fair value of financial liabilities (3,515,550) (3,481,741) (1,988,445)
Derivative financial instruments      
Fair value measurements      
Carrying amount of financial liabilities (122,948)   (14,144)
Fair value of financial liabilities (122,948)   (14,144)
Jet fuel Asian call options      
Fair value measurements      
Carrying amount of derivative financial assets 48,199 497,403 867,809
Fair value of derivative financial assets 48,199 497,403 867,809
Fair value of financial liabilities (122,948)    
Foreign currency forward contract      
Fair value measurements      
Carrying amount of derivative financial assets 14,241    
Fair value of derivative financial assets 14,241    
Interest rate swap contracts      
Fair value measurements      
Fair value of financial liabilities     $ (14,144)
Level 2      
Fair value measurements      
Net fair value (3,576,058) (2,984,338)  
Level 2 | Interest-bearing loans and borrowings      
Fair value measurements      
Fair value of financial liabilities (3,515,550) (3,481,741)  
Level 2 | Jet fuel Asian call options      
Fair value measurements      
Fair value of derivative financial assets 48,199 $ 497,403  
Fair value of financial liabilities (122,948)    
Level 2 | Foreign currency forward contract      
Fair value measurements      
Fair value of derivative financial assets $ 14,241