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Other accounts receivable, net - Movement in the allowance for doubtful accounts (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other accounts receivable, net      
Balance as of beginning of the year $ (40,308) $ (11,304) $ (17,809)
Write-offs 21,264 11,389 17,126
Increase in allowance (13,664) (40,393) (10,621)
Balance as of end of the year $ (32,708) $ (40,308) $ (11,304)