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Financial instruments and risk management - Foreign exchange on and off-balance sheet exposure (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
MXN ($)
$ / $
Apr. 25, 2018
$ / $
Dec. 31, 2017
Q / $
Dec. 31, 2017
₡ / $
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
contract
Dec. 31, 2016
$ / $
Dec. 31, 2016
Q / $
Dec. 31, 2016
₡ / $
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2014
MXN ($)
Assets                            
Cash and cash equivalents         $ 352,204 $ 6,950,879         $ 358,303 $ 7,071,251 $ 5,157,313 $ 2,264,857
Other accounts receivable         24,244 478,467           427,403    
Total assets         1,148,509 22,666,267           21,781,771    
Liabilities                            
Financial debt           3,482,714           1,994,283 $ 1,591,019  
Foreign suppliers         54,594 1,077,438           861,805    
Derivative financial instruments                       14,144    
Total liabilities         633,538 12,503,096           $ 10,987,695    
Exchange rate 19.7354 18.8628 7.3448 572.5600       20.6640 7.5221 561.1000        
Aircraft and engine commitments         1,123,377 $ 22,170,295                
Foreign currency forward contract                            
Liabilities                            
Net loss on foreign currency forward contract $ 11,290                          
Number of foreign currency forward contracts | contract             0              
Foreign exchange and off-balance sheet exposure                            
Assets                            
Cash and cash equivalents         344,038           297,565      
Other accounts receivable         13,105           11,619      
Aircraft maintenance deposits paid to lessors         352,142           343,787      
Deposits for rental of flight equipment         25,343           30,025      
Derivative financial instruments         25,204           41,996      
Total assets         759,832           724,992      
Liabilities                            
Financial debt         128,296           76,789      
Foreign suppliers         53,729           56,109      
Taxes and fees payable         10,304           6,874      
Derivative financial instruments                     684      
Total liabilities         192,329           140,456      
Net foreign currency position         567,503           584,536      
Aircraft and engine operating lease payments         1,856,909           1,727,644      
Aircraft and engine commitments         1,123,377           315,326      
Total off-balance sheet transactions exposure         $ 2,980,286           $ 2,042,970      
Aircraft rental expense | Foreign currency forward contract                            
Liabilities                            
Percentage of expense hedged 9.00%