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Employee benefits (Narrative) (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Disclosure of defined benefit plans [line items]            
Percentage of collective bargaining agreements 44.00% 44.00% 43.00% 43.00%    
Percentage share of employers profits 10.00% 10.00%        
Employee profit sharing amount   $ 0   $ 0    
Percentage payment of workers daily integrated salary 2.00% 2.00%        
Defined contribution plan expense   $ 12,098   $ 12,338   $ 13,687
Republic employees [Member]            
Disclosure of defined benefit plans [line items]            
Percentage of collective bargaining agreements 70.00% 70.00% 79.00% 79.00%    
Agreement description The agreement initially expired on August 15, 2016, was extended for three years through August 15, 2019, and further extended through August 15, 2022. The agreement initially expired on August 15, 2016, was extended for three years through August 15, 2019, and further extended through August 15, 2022.        
Company's quarterly contributions The extended agreement provides that Company's quarterly contributions to fund the Republic Retirement VEBA Benefit Trust (the "Benefit Trust") be reduced from $2.6 million to $0.25 million beginning in August 15, 2016 through June 30, 2019. Effective July 1, 2019, the Company's contribution to the Benefit Trust changed to $4.00 per hour for each hour worked by USW represented employees. Effective August 16, 2019, until June 30, 2022, the Company obligation to finance the Profit Trust changed again and is limited to the creation of a profit-sharing pool consisting of 3% of the quarterly profits from $ 0 to 50 million and 4% of the profits of the Company over % 50 million. Effective July 1, 2022, the Company’s contribution to the Beneficiary Trust changes back to a limit of $ 4.00 per hour worked by USW represented employees. The extended agreement provides that Company's quarterly contributions to fund the Republic Retirement VEBA Benefit Trust (the "Benefit Trust") be reduced from $2.6 million to $0.25 million beginning in August 15, 2016 through June 30, 2019. Effective July 1, 2019, the Company's contribution to the Benefit Trust changed to $4.00 per hour for each hour worked by USW represented employees. Effective August 16, 2019, until June 30, 2022, the Company obligation to finance the Profit Trust changed again and is limited to the creation of a profit-sharing pool consisting of 3% of the quarterly profits from $ 0 to 50 million and 4% of the profits of the Company over % 50 million. Effective July 1, 2022, the Company’s contribution to the Beneficiary Trust changes back to a limit of $ 4.00 per hour worked by USW represented employees.        
Fixed amount per hour for each covered employees | $ / shares   $ 1.68        
VEBA Benefit Trust [Member] | USD [Member]            
Disclosure of defined benefit plans [line items]            
Defined contribution plan expense $ 0   $ 1,100      
401(k) Plans [Member] | USD [Member]            
Disclosure of defined benefit plans [line items]            
Defined contribution plan expense $ 1,100   1,100   $ 1,000  
Profit Sharing and Incentive Compensation Plans [Member]            
Disclosure of defined benefit plans [line items]            
Agreement description The labor agreement includes a profit sharing plan to which the Company is required to contribute The extended agreement modified the plan to the following quarterly pretax income, as defined in the labor agreement ("EBT"): 3% of EBT between $0 and $25 million per quarter; 4% of EBT between $25 and $75 million per quarter; and 5% of EBT over $75 million per quarter. The labor agreement includes a profit sharing plan to which the Company is required to contribute The extended agreement modified the plan to the following quarterly pretax income, as defined in the labor agreement ("EBT"): 3% of EBT between $0 and $25 million per quarter; 4% of EBT between $25 and $75 million per quarter; and 5% of EBT over $75 million per quarter.        
Profit Sharing and Incentive Compensation Plans [Member] | USD [Member]            
Disclosure of defined benefit plans [line items]            
Defined contribution plan expense     1,000  
Benefits paid 0   0   800  
Republic [Member] | USD [Member]            
Disclosure of defined benefit plans [line items]            
Defined contribution plan expense $ 3,100   $ 3,600   $ 3,000