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Income tax - Reconciliation of statutory corporate income tax rate to effective tax rate (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Statutory income tax rate   $ 814,344 $ (1,709,992) $ 1,120,168
Amendment tax return effects and other tax adjustments   93 53,192 18,770
Inflation on furniture, intangible and equipment   (48,751) (17,442) (17,839)
Inflation of tax losses   (41,375) (13,512) (8,018)
Foreign countries difference with Mexican statutory rate   2,609 3,509 4,143
Annual inflation adjustment   (167,294) 51,768 (1,882)
Recorded deferred taxes on tax losses   (9,123) 74,597 10,025
Non-deductible expenses   43,425 258,080 7,004
Total income tax expense $ 28,855 $ 593,928 $ (1,406,184) $ 1,094,831
Statutory income tax rate 30.00% 30.00% 30.00% 30.00%
Amendment tax return effects and other tax adjustments (0.01%) (0.01%) 0.92% (0.51%)
Inflation on furniture, intangible and equipment (1.79%) (1.79%) 0.29% (0.48%)
Inflation of tax losses (1.52%) (1.52%) 0.23% (0.21%)
Foreign countries difference with Mexican statutory rate 0.10% 0.10% (0.06%) 0.11%
Annual inflation adjustment (6.16%) (6.16%) (0.91%) (0.05%)
Recorded deferred taxes on tax losses (0.34%) (0.34%) (1.29%) 0.27%
Non-deductible expenses 1.60% 1.60% (4.51%) 0.19%
Total effective tax rate 21.88% 21.88% 24.67% 29.32%