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Subsidiaries with material non-controlling interest (Details Textual) S/ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 PEN (S/) | Dec. 31, 2015 USD ($)
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 | $ 621,000 | $ 5,459,000 |  | $ 0
Increasedecrease in proportion of ownership interest in subsidiaries that result in dilution of non controlling interests | 0.09% | 7.26% | 7.26% |
Purchase Of Shares Value | $ 621,000 |  |  |
Increasedecrease of ownership interest in subsidiaries that result in dilution of non controlling interests |  | $ 5,400,000 |  |
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 |  | 18,600,000 |  |
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 |  | $ 45,200,000 |  |

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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 2017-01-01 -Paragraph 42A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_42A&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 42B -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_42B&doctype=Standard -URIDate 2017-03-09 + Details
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