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Income tax - Reconciliation of statutory corporate income tax rate to effective tax rate (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income tax      
Statutory income tax rate 30.00% 30.00% 30.00%
Amendment tax return effects and other tax adjustments 0.92% (0.51%) 0.05%
Inflation on furniture, intangible and equipment 0.29% (0.48%) 2.08%
Inflation of tax losses 0.23% (0.21%) 1.16%
Foreign countries difference with Mexican statutory rate (0.06%) 0.11% (0.02%)
Annual inflation adjustment (0.91%) (0.05%) 0.26%
Unrecorded deferred taxes on tax losses (1.29%) 0.27% (3.96%)
Non-deductible expenses (4.51%) 0.19% (2.51%)
Total effective tax rate 24.67% 29.32% 27.06%