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Investment properties, net | 12 Months Ended
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Dec. 31, 2017
Disclosure of Investment properties, net [Abstract] |
Disclosure of investment property [text block] |
12. | Investment properties, net
| (a) | As of December 31, 2017 and 2016, the investment properties included administrative offices. The movement of cost and accumulated depreciation for the years 2017 and 2016 is presented below:
|  | Balance as of January 1, 2016 |  | Addition (reversal) |  | Balance as of December 31, 2016 |  | Additions |  | Sales |  | Balance as of December 31, 2017 |
|  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |
Cost |  |  | 12,103 |  |  | (92) |  |  | 12,011 |  |  | 157 |  |  | (11,826) |  |  | 342 |
Accumulated depreciation |  |  | (1,384) |  |  | (538) |  |  | (1,922) |  |  | (462) |  |  | 2,264 |  |  | (120) |
Net cost |  |  | 10,719 |  |  |  |  |  | 10,089 |  |  |  |  |  |  |  |  | 222 |
| (b) | The Group does not have restrictions in the realization of its investment properties.
| (c) | During 2017 the fair value of the investment property amounted to US$191,086 (US$23,624,295 during 2016).
| (d) | As mentioned in note 16(e), the subsidiary Buenaventura Ingenieros S.A. (hereinafter "BISA") sold to a third party its investment properties located in the El Derby Capital Building, district of Surco, for US$11,250,000, with a net cost of US$9.6 million.
| (e) | During 2017, rental income, from these investment properties amounted to US$234,677 (US$1,821,320 and US$1,710,766 during 2016 and 2015, respectively).

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- Definition The entire disclosure for investment property. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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