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Consolidated statements of cash flows: (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Consolidated Statements Of Cash Flows [Line Items]      
Short term debt (Note 11) $ 353,672 $ 330,235  
Short-term bank loans (Note 10) 224,472 808,515  
Long-term bank loans (Note 10) 6,603,006 6,119,655  
Long-term debt (Note 11) 6,598,397 6,641,941  
Interest expense 842,386 926,312 $ 1,084,293
Proceeds from bank loans 4,650,000 306,241  
Interest paid (908,698) (942,993) (1,064,764)
Bank loans paid (Note 10) (4,429,334) (245,520) (152,047)
Long-term debt      
Disclosure Of Consolidated Statements Of Cash Flows [Line Items]      
Short term debt (Note 11) 353,672 330,235 311,372
Long-term debt (Note 11) 6,598,397 6,641,941 6,488,569
Non-current portion of non-current secured bank loans received 6,972,176 6,799,941 7,282,268
Interest expense 454,863 450,806 444,028
Interest paid (428,530) (476,927) (486,164)
Bank loans paid (Note 10)   (245,520)  
Payments of the long term debt and bank loan (220,961)   (205,308)
Foreign currency translation 174,521 452,281 (234,883)
Non-current portion of non-current secured bank loans received 6,952,069 6,972,176 6,799,941
Bank Loans      
Disclosure Of Consolidated Statements Of Cash Flows [Line Items]      
Short-term bank loans (Note 10) 224,472 808,515 238,235
Long-term bank loans (Note 10) 6,603,006 6,119,655 6,674,717
Non-current portion of non-current secured bank loans received 6,928,170 6,912,952 7,218,113
Interest expense 387,523 398,899 601,873
Proceeds from bank loans 4,650,000 306,241  
Interest paid (480,168) (466,066) (578,600)
Bank loans paid (Note 10) (4,429,334) (245,520)  
Payments of the long term debt and bank loan     (152,047)
Foreign currency translation (228,713) 21,664 (176,387)
Non-current portion of non-current secured bank loans received $ 6,827,478 $ 6,928,170 $ 6,912,952