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Subsidiaries with material non-controlling interest (Details Textual) $ in Thousands, S/ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 PEN (S/)
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Payments from changes in ownership interests in subsidiaries that do not result in loss of control | $ 0 | $ 621 | $ 5,459 |
Increasedecrease in proportion of ownership interest in subsidiaries that result in dilution of non controlling interests |  | 0.09% | 7.26% | 7.26%
Investment one [Member] | Peruvian Soles [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Payments from changes in ownership interests in subsidiaries that do not result in loss of control | S/ |  |  |  | S/ 63.9
Investment one [Member] | US dollars [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Payments from changes in ownership interests in subsidiaries that do not result in loss of control |  |  | $ 18,600 |
Investment two [Member] | US dollars [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Payments from changes in ownership interests in subsidiaries that do not result in loss of control |  |  | $ 45,200 |

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- Definition The cash outflow for changes in ownership interests in subsidiaries that do not result in a loss of control. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 42A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_42A&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 42B -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_42B&doctype=Standard -URIDate 2018-03-16 + Details
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