Labor obligations - Movements in defined benefit obligation (Details) - Defined benefit plan - MXN ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in net defined benefit liability (asset) [abstract]
Current service cost	$ 8,276	$ 7,465	$ 7,467
Interest cost	8,490	7,156	7,677
Reductions and liquidations advance	(9,131)
Remeasurement (gains)/losses:
Actuarial gains and losses arising from changes in financial and demographic assumptions	(2,653)	161	10,131
Actuarial gains and losses arising from experience assumptions	(10,386)	(12,995)	14,042
Present value of defined benefit obligation
Changes in net defined benefit liability (asset) [abstract]
Present value of defined benefit obligation at beginning of period	106,160	79,905	127,479
Current service cost	8,276	7,465	7,467
Interest cost	8,490	7,156	7,677
Reductions and liquidations advance	(9,131)
Remeasurement (gains)/losses:
Actuarial gains and losses arising from changes in financial and demographic assumptions	2,653	(161)	(10,131)
Actuarial gains and losses arising from experience assumptions	10,386	12,995	(14,042)
Benefits paid	(11,143)	(1,200)	(38,545)
Present value of defined benefit obligation at end of period	$ 115,691	$ 106,160	$ 79,905

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

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-Name IAS
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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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-Name IAS
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from reductions and liquidation advance.

+ References

No definition available.

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