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Consolidated statements of cash flows: (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Jun. 02, 2015
COP ($)
Jun. 02, 2015
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure Of Consolidated Statements Of Cash Flows [Line Items]          
Bank loans (Note 10)     $ 808,515 $ 238,235  
Bank loans (Note 10)     6,119,655 6,674,717  
Long-term debt (Note 11)     6,641,941 6,488,569  
Interest expense     926,312 1,084,293 $ 1,230,651
Proceeds from bank loans     306,241    
Interest paid     (962,993) (1,064,764) (1,139,071)
Bank loans paid (Note 10) $ (440,000,000) $ (2,897,404) (243,998) (152,047) (3,090,124)
Long-term debt          
Disclosure Of Consolidated Statements Of Cash Flows [Line Items]          
Accounts payable     330,235 311,372 324,590
Long-term debt (Note 11)     6,641,941 6,488,569 6,957,678
Non-current portion of non-current secured bank loans received     6,799,941 7,282,268 7,489,465
Interest expense     450,806 444,028 475,110
Interest paid     (476,927) (486,164) (646,418)
Bank loans paid (Note 10)     (253,925) (205,308)  
Foreign currency translation     452,281 (234,883) (35,889)
Non-current portion of non-current secured bank loans received     6,972,176 6,799,941 7,282,268
Bank Loans          
Disclosure Of Consolidated Statements Of Cash Flows [Line Items]          
Bank loans (Note 10)     808,515 238,235 175,515
Bank loans (Note 10)     6,119,655 6,674,717 7,042,598
Non-current portion of non-current secured bank loans received     6,912,952 7,218,113 10,494,853
Interest expense     398,899 601,873 696,641
Proceeds from bank loans     306,241    
Interest paid     (466,066) (578,600) (492,653)
Bank loans paid (Note 10)     (245,520) (152,047) (3,090,124)
Foreign currency translation     21,664 (176,387) (166,301)
Exchange (income) / loss on foreign currency         (224,303)
Non-current portion of non-current secured bank loans received     $ 6,928,170 $ 6,912,952 $ 7,218,113