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Fair value measurements - Carrying amount and fair value (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair value measurements    
Carrying amount of derivative financial assets $ 497,403 $ 867,809
Fair value of derivative financial assets 497,403 867,809
Net carrying amount (2,979,339) (1,134,516)
Net fair value (2,984,338) (1,134,780)
Transfers of assets from level 1 to level 2 0 0
Transfers of assets from level 2 to level 1 0 0
Transfers of liabilities from level 1 to level 2 0 0
Transfers of liabilities from level 2 to level 1 0 0
Financial debt    
Fair value measurements    
Carrying amount of financial liabilities (3,476,742) (1,988,181)
Fair value of financial liabilities (3,481,741) (1,988,445)
Interest-bearing loans and borrowings    
Fair value measurements    
Fair value of financial liabilities (3,481,741) (1,988,445)
Derivative financial instruments    
Fair value measurements    
Carrying amount of financial liabilities   (14,144)
Fair value of financial liabilities   (14,144)
Jet fuel Asian call options    
Fair value measurements    
Carrying amount of derivative financial assets 497,403 867,809
Fair value of derivative financial assets 497,403 867,809
Interest rate swap contracts    
Fair value measurements    
Fair value of financial liabilities   (14,144)
Level 2    
Fair value measurements    
Net fair value (2,984,338) (1,134,780)
Level 2 | Interest-bearing loans and borrowings    
Fair value measurements    
Fair value of financial liabilities (3,481,741) (1,988,445)
Level 2 | Jet fuel Asian call options    
Fair value measurements    
Fair value of derivative financial assets $ 497,403 867,809
Level 2 | Interest rate swap contracts    
Fair value measurements    
Fair value of financial liabilities   $ (14,144)