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Share-based payments - Share purchase plan (Details)
 1 Months Ended 12 Months Ended
Nov. 11, 2014
USD ($)
$ / $
Nov. 11, 2014
MXN ($)
$ / $
Nov. 30, 2022
USD ($)
Dec. 31, 2022
EquityInstruments
USD ($)
shares
Dec. 31, 2021
USD ($)
EquityInstruments
shares
Dec. 31, 2020
USD ($)
EquityInstruments
Apr. 18, 2023
MXN ($)
Dec. 31, 2022
$ / $
Dec. 31, 2022
₡ / $
Dec. 31, 2022
Q / $
Dec. 31, 2021
$ / $
Dec. 31, 2021
₡ / $
Dec. 31, 2021
Q / $
Dec. 31, 2020
$ / $
Dec. 31, 2020
₡ / $
Dec. 31, 2020
Q / $
Share purchase plan                                
Exchange rate       4,810.20 3,981.16 3,428.26 18.0638 19.36 594.9700 7.8515 20.58 645.900 7.7285 19.9487 615.7800 7.8095
Forfeited during the year       (103,712) (551,732)                      
Share purchase plan                                
Share purchase plan                                
Special bonus granted $ 797,000 $ 10,831,000                            
Exchange rate | $ / $ 13.58 13.58                            
Special bonus net of withheld taxes $ 520,000 $ 7,059,000                            
Cost of extensions to LTIP approved | $     $ 5,703,000   $ 5,086,000 $ 4,618,000                    
Cost of extensions net of withheld taxes | $     $ 3,707,000   $ 3,307,000 $ 3,003,000                    
Forfeited during the year       (103,712) (551,732) (327,217)                    
Outstanding at end of the year       6,579,214                        
Share purchase plan | Series A shares                                
Share purchase plan                                
Outstanding at beginning of the year       4,490,421 5,805,311                      
Purchased during the year | shares       4,354,473 1,849,417                      
Exercised/vested during the year       (2,161,968) (2,612,575)                      
Forfeited during the year       (103,712) (551,732)                      
Outstanding at end of the year       6,579,214 4,490,421 5,805,311