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Financial instruments and risk management - Maturity analysis for financial liabilities (Details) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments $ 3,476,742 $ 2,002,325
Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 2,397,590 1,059,279
Between one year and five years    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 1,079,152 943,046
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 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 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 1,079,152 943,046
Short-term working capital facilities    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments 948,354 716,290
Short-term working capital facilities | Within one year    
Liquidity risk    
Contractual principal payments on financial liabilities and derivative financial instruments $ 948,354 $ 716,290