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Employee benefits (Narrative) (Details) $ / shares in Units, $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($)
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Percentage of collective bargaining agreements | 43.00% | 43.00% | 44.00% | 44.00% |  |
Percentage share of employers profits | 10.00% | 10.00% |  |  |  |
Employee profit sharing amount |  | $ 67 |  | $ 0 |  |
Percentage payment of workers daily integrated salary | 2.00% | 2.00% |  |  |  |
Defined contribution plan expense |  | $ 13,687 |  | 12,838 |  | $ 11,323
Benefits paid |  | $ (327) |  | $ (12,517) |  |
Republic employees [Member] |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Percentage of collective bargaining agreements | 81.00% | 81.00% |  |  |  |
Agreement description | The agreement initially expired on August 15, 2016 and was extended for a further three years through August 15, 2019. | The agreement initially expired on August 15, 2016 and was extended for a further three years through August 15, 2019. |  |  |  |
Company's quarterly contributions | The extended agreement provides the Company’s quarterly contributions to fund the Republic Retirement VEBA and Benefit Trust (the “Benefit Trust”) to 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 will change to $4.00 per hour for each hour worked by USW represented employees. | The extended agreement provides the Company’s quarterly contributions to fund the Republic Retirement VEBA and Benefit Trust (the “Benefit Trust”) to 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 will change to $4.00 per hour for each hour worked by USW represented employees. |  |  |  |
Fixed amount per hour for each covered employees | $ / shares | $ 1.68 |  |  |  |  |
VEBA Benefit Trust [Member] |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Agreement description | The cost contributions to these two funds have been reduced from USD $ 2.6 million to USD$ 0.25 million per quarter effective after the review of the collective agreement on August 16 2016. | The cost contributions to these two funds have been reduced from USD $ 2.6 million to USD$ 0.25 million per quarter effective after the review of the collective agreement on August 16 2016. |  |  |  |
VEBA Benefit Trust [Member] | USD [Member] |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Defined contribution plan expense | $ 1,000 |  | $ 6,900 |  | $ 10,400 |
401(k) Plans [Member] | USD [Member] |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Defined contribution plan expense | $ 1,000 |  | 800 |  | 700 |
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 |  | 1,000 |  | 1,000 |
Benefits paid | 800 |  | 900 |  | 600 |
Republic [Member] | USD [Member] |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Defined contribution plan expense | $ 3,600 |  | $ 3,500 |  | $ 10,000 |

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- Definition The description of the contractual agreement or stated policy for charging the net defined benefit cost, or the fact that there is no such policy, for an entity participating in defined benefit plans that share risks between various entities under common control. [Refer: Defined benefit plans that share risks between entities under common control [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 149 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_149_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The description of available information about a surplus or deficit in a multi-employer or state plan that may affect the amount of future contributions. [Refer: Multi-employer defined benefit plans [member]; State defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 148 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_148_d_iv&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_g&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_53&doctype=Standard -URIDate 2018-03-16 + Details
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