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Description of the business and summary of significant accounting policies - Impact of new International Financial Reporting Standards (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2018
MXN ($)
$ / shares
Dec. 31, 2017
MXN ($)
$ / shares
Dec. 31, 2016
MXN ($)
$ / shares
Dec. 31, 2018
MXN ($)
Impact of adoption on the consolidated statements of financial position          
Unearned transportation revenue $ 123,890   $ 2,293,309 $ 2,228,051 $ 2,438,516
Retained earnings 216,730   4,948,376 5,853,092 4,265,876
Impact of adoption on the consolidated statements of operations          
Fare revenues 939,285 $ 18,487,858 17,791,317 17,790,130  
Other passenger revenues 400,982 7,892,497 6,098,504 4,919,452  
Passenger revenues 1,340,267 26,380,355 23,889,821 22,709,582  
Other non-passenger services 35,430 697,357 727,392 590,355  
Cargo 11,555 227,438 170,973 171,623  
Non- passenger revenues     898,365 761,978  
Operating revenues 1,387,252 27,305,150 24,788,186 23,471,560  
Operating expense     24,826,733 20,772,760  
Operating income (loss) (44,735) (880,530) (38,547) 2,698,800  
Net (loss) income $ (34,674) $ (682,500) $ (651,788) $ 3,478,598  
(Loss) Earnings per share basic: | (per share) $ (0.034) $ (0.674) $ (0.644) $ 3.438  
Assets          
Deferred income tax     $ 1,304,033 $ 978,683 2,029,811
Equity:          
Retained earnings $ 216,730   4,948,376 5,853,092 4,265,876
Impact on the statement of operations          
Operating income (44,735) $ (880,530) (38,547) 2,698,800  
Finance cost 6,114 120,334 86,357 35,116  
Foreign exchange (gain) loss 3,682 72,475 793,854 (2,169,505)  
Income tax expense (benefit) 12,104 238,236 161,175 (1,457,182)  
Net (income) loss $ 34,674 682,500 651,788 (3,478,598)  
Impact of IFRS 16 adoption          
Impact of adoption on the consolidated statements of financial position          
Retained earnings       6,497,366  
Impact of adoption on the consolidated statements of operations          
Operating income (loss)   (1,595,144) (1,516,182)    
Net (loss) income   (78,371) 1,101,595    
Assets          
Property, plant and equipment (Right-of-use-assets)     25,075,501 23,709,968 31,985,598
Deferred income tax     2,231,702 2,699,552 2,271,031
Prepaid expenses       (266,959)  
Liabilities          
Lease liabilities     32,436,015 32,639,927 $ 39,463,811
Equity:          
Retained earnings       6,497,366  
Impact on the statement of operations          
Depreciation expense   4,123,513 3,522,738    
Operating lease expense   (5,718,657) (5,038,920)    
Operating income   (1,595,144) (1,516,182)    
Finance cost   1,682,420 1,381,027    
Foreign exchange (gain) loss   30,423 (1,434,290)    
Income tax expense (benefit)   (39,328) 467,850    
Net (income) loss   $ 78,371 (1,101,595)    
As previously reported          
Impact of adoption on the consolidated statements of financial position          
Unearned transportation revenue     2,161,636 2,153,567  
Retained earnings     5,080,049 5,927,576  
Impact of adoption on the consolidated statements of operations          
Fare revenues     17,791,317 17,790,130  
Passenger revenues     17,791,317 17,790,130  
Other non-passenger services     6,883,085 5,550,698  
Cargo     170,973 171,623  
Non- passenger revenues     7,054,058 5,722,321  
Operating revenues     24,845,375 23,512,451  
Operating expense     24,826,733 20,772,760  
Operating income (loss)     18,642 2,739,691  
Net (loss) income     $ (594,599) $ 3,519,489  
(Loss) Earnings per share basic: | $ / shares     $ (0.588) $ 3.478  
Equity:          
Retained earnings     $ 5,080,049 $ 5,927,576  
Impact on the statement of operations          
Operating income     18,642 2,739,691  
Net (income) loss     594,599 (3,519,489)  
Adjustment          
Impact of adoption on the consolidated statements of financial position          
Unearned transportation revenue     131,673 74,484  
Retained earnings     (131,673) (74,484)  
Impact of adoption on the consolidated statements of operations          
Other passenger revenues     6,098,504 4,919,452  
Passenger revenues     6,098,504 4,919,452  
Other non-passenger services     (6,155,693) (4,960,343)  
Non- passenger revenues     (6,155,693) (4,960,343)  
Operating revenues     (57,189) (40,891)  
Operating income (loss)     (57,189) (40,891)  
Net (loss) income     (57,189) (40,891)  
Equity:          
Retained earnings     (131,673) (74,484)  
Impact on the statement of operations          
Operating income     (57,189) (40,891)  
Net (income) loss     $ 57,189 $ 40,891