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Financial instruments and risk management - Maturity analysis for financial liabilities (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments $ 3,629,782 $ 3,476,742 $ 2,002,325
Within one year      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments 1,318,843 2,397,590 1,059,279
Between one year and five years      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments 2,310,939 1,079,152 943,046
Jet Fuel Asian Zero-Cost collar options      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments 122,948    
Jet Fuel Asian Zero-Cost collar options | Within one year      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments 122,948    
Interest rate swap contracts      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments     14,144
Interest rate swap contracts | Within one year      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments     14,144
Revolving line of credit      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments 3,045,574 2,528,388 1,271,891
Revolving line of credit | Within one year      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments 734,635 1,449,236 328,845
Revolving line of credit | Between one year and five years      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments 2,310,939 1,079,152 943,046
Short-term working capital facilities      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments 461,260 948,354 716,290
Short-term working capital facilities | Within one year      
Liquidity risk      
Contractual principal payments on financial liabilities and derivative financial instruments $ 461,260 $ 948,354 $ 716,290