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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, 2018
MXN ($)
$ / $
Dec. 31, 2017
MXN ($)
$ / $
Dec. 31, 2016
MXN ($)
contract
Apr. 25, 2019
$ / $
Dec. 31, 2018
Q / $
Dec. 31, 2018
₡ / $
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
Q / $
Dec. 31, 2017
₡ / $
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
$ / $
Dec. 31, 2016
Q / $
Dec. 31, 2016
₡ / $
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Assets                                    
Cash and cash equivalents             $ 297,870 $ 5,862,942     $ 353,143 $ 6,950,879         $ 7,071,251 $ 5,157,313
Other accounts receivable             25,834 508,479       478,467         427,403  
Total assets             1,133,504 22,310,651       22,666,267         21,781,771  
Liabilities                                    
Financial debt               3,523,198       3,482,714         1,994,283 $ 1,591,019
Foreign suppliers             55,149 1,085,499       1,077,438         861,805  
Derivative financial instruments               122,948                 14,144  
Total liabilities             667,532 13,138,971       $ 12,634,769         $ 11,062,179  
Exchange rate 19.6829 19.7354   18.9578 7.7440 609.6100     7.3448 572.5600     20.6640 7.5221 561.1000      
Aircraft and engine commitments             1,070,187 $ 21,064,384                    
Foreign currency forward contract                                    
Liabilities                                    
Unrealized gains relating to the foreign currency forward contracts is included in OCI $ 14,241                                  
Net loss on foreign currency forward contract $ 52,516 $ 11,290 $ 0                              
Number of foreign currency forward contracts | contract     0                              
Foreign exchange and off-balance sheet exposure                                    
Assets                                    
Cash and cash equivalents             279,829       344,038         $ 297,565    
Other accounts receivable             10,957       13,105         11,619    
Aircraft maintenance deposits paid to lessors             329,983       352,142         343,787    
Deposits for rental of flight equipment             32,166       25,343         30,025    
Derivative financial instruments             3,172       25,204         41,996    
Total assets             656,107       759,832         724,992    
Liabilities                                    
Financial debt             155,455       128,296         76,789    
Foreign suppliers             51,012       53,729         56,109    
Taxes and fees payable             14,823       10,304         6,874    
Derivative financial instruments             6,246                 684    
Total liabilities             227,536       192,329         140,456    
Net foreign currency position             428,571       567,503         584,536    
Aircraft and engine operating lease payments             2,334,767       1,840,316         1,727,644    
Aircraft and engine commitments             1,070,187       1,123,377         315,326    
Total off-balance sheet transactions exposure             $ 3,404,954       $ 2,963,693         $ 2,042,970    
Aircraft rental expense | Foreign currency forward contract                                    
Liabilities                                    
Percentage of expense hedged 20.00% 9.00%