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Description of the business and summary of significant accounting policies - Foreign currency exchange differences and liabilities and provisions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
$ / $
Q / $
Dec. 31, 2020
$ / $
₡ / $
Dec. 31, 2020
USD ($)
$ / $
Dec. 31, 2020
MXN ($)
$ / $
Dec. 31, 2019
$ / $
Q / $
Dec. 31, 2019
$ / $
₡ / $
Dec. 31, 2019
$ / $
USD ($)
Dec. 31, 2019
MXN ($)
$ / $
Dec. 31, 2018
$ / $
Q / $
Dec. 31, 2018
$ / $
₡ / $
Dec. 31, 2018
MXN ($)
$ / $
Apr. 29, 2021
$ / $
Dec. 31, 2020
Q / $
Dec. 31, 2020
₡ / $
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Q / $
Dec. 31, 2019
₡ / $
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Q / $
Dec. 31, 2018
₡ / $
Description of the business and summary of significant accounting policies                                        
Average exchange rate for year 7.7292 588.4240 21.4961   7.7066 590.9574 19.2618   7.5337 580.8534                    
Exchange rate as of end of the year 19.9487 19.9487 19.9487 19.9487 18.8452 18.8452 18.8452 18.8452 19.6829 19.6829 19.6829 19.9785 7.8095 615.7800 19.9487 7.6988 573.4400 18.8452 7.7440 609.6100
Exchange differences on translation of foreign operations     $ 1,202,000 $ 23,970       $ 8,045     $ 22,156