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Shareholders' equity, net (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Shareholders' equity, net [Line Items] |
Disclosure of detailed information about dividends declared and paid [Text Block] | The table below presents the dividends declared and paid in 2018, 2017 and 2016:
Meetings |  | Date |  | Dividends declared and paid |  |  | Dividend per share |
|  |  |  | US$(000) |  |  | US$ |
2018 Dividends |  |  |  |  |  |  |  |  |  |
Mandatory Annual Shareholders’ Meeting |  | March 27 |  |  | 8,269 |  |  |  | 0.03 |
Less - Dividends of treasury shares |  |  |  |  | (648 | ) |  |  |  |
|  |  |  |  | 7,621 |  |  |  |  |
Board of Directors’ Meeting |  | October 25 |  |  | 16,538 |  |  |  | 0.06 |
Less - Dividends of treasury shares |  |  |  |  | (1,299 | ) |  |  |  |
|  |  |  |  | 15,239 |  |  |  |  |
|  |  |  |  | 22,860 |  |  |  |  |
2017 Dividends |  |  |  |  |  |  |  |  |  |
Mandatory Annual Shareholders’ Meeting |  | March 28 |  |  | 15,711 |  |  |  | 0.056 |
Less - Dividends of treasury shares |  |  |  |  | (1,232 | ) |  |  |  |
|  |  |  |  | 14,479 |  |  |  |  |
Board of Directors’ Meeting |  | October 27 |  |  | 8,269 |  |  |  | 0.030 |
Less - Dividends of treasury shares |  |  |  |  | (649 | ) |  |  |  |
|  |  |  |  | 7,620 |  |  |  |  |
|  |  |  |  | 22,099 |  |  |  |  |
2016 Dividends |  |  |  |  |  |  |  |  |  |
Board of Directors’ Meeting |  | October 27 |  |  | 8,269 |  |  |  | 0.03 |
Less - Dividends of treasury shares |  |  |  |  | (648 | ) |  |  |  |
|  |  |  |  | 7,621 |  |  |  |  |
Disclosure of detailed information about equity share capital [Text Block] | As of December 31, 2018, the Company’s capital stock structure is as follows:
Percentage of individual interest in capital |  | Number of shareholders |  |  | Total percentage interest |
Up to 1.00 |  |  | 2,811 |  |  |  | 4.37 |
From 1.01 to 20.00 |  |  | 2 |  |  |  | 21.07 |
From 20.01 to 30.00 |  |  | 1 |  |  |  | 21.00 |
From 30.01 to 60.00 |  |  | 1 |  |  |  | 53.56 |
|  |  | 2,815 |  |  |  | 100.00 |
Disclosure Of Earning Per Share [Text Block] | The calculation of profit (loss) per share attributable to the equity holders of the parent is presented below:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Profit (loss) net (numerator) - US$ |  |  | (13,445,000 | ) |  |  | 60,823,000 |  |  |  | (323,492,000 | )
Total common and investment shares (denominator) |  |  | 253,986,867 |  |  |  | 253,986,867 |  |  |  | 253,986,867 |
Profit (loss) net per basic share and diluted - US$ |  |  | (0.05 | ) |  |  | 0.24 |  |  |  | (1.27 | )
The calculation of profit (loss) per share from continuing operations attributable to the equity holders of the Parent is presented below:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Profit (loss) net (numerator) - US$ |  |  | (6,242,000 | ) |  |  | 70,921,000 |  |  |  | (304,419,000 | )
Total common and investment shares (denominator) |  |  | 253,986,867 |  |  |  | 253,986,867 |  |  |  | 253,986,867 |
Profit (loss) net per basic share and diluted - US$ |  |  | (0.02 | ) |  |  | 0.28 |  |  |  | (1.20 | )
capital stock [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Disclosure of classes of share capital [text block] | The Group’s share capital is stated in Soles and consists of common shares with voting rights, with a nominal amount of S/10.00 per share. The table below presents the composition of the capital stock as of December 31, 2018 and 2017:
|  | Number of shares |  |  | Capital stock |  |  | Capital stock |
|  |  |  |  | S/(000) |  |  | US$(000) |
Common shares |  |  | 274,889,924 |  |  |  | 2,748,899 |  |  |  | 813,162 |
Treasury shares |  |  | (21,174,734 | ) |  |  | (211,747 | ) |  |  | (62,665 | )
|  |  | 253,715,190 |  |  |  | 2,537,152 |  |  |  | 750,497 |
investment shares [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Disclosure of classes of share capital [text block] | The table below presents the composition of the investment shares as of December 31, 2018 and 2017:
|  | Number of shares |  |  | Investment shares |  |  | Investment shares |
|  |  |  |  | S/(000) |  |  | US$(000) |
Investment shares |  |  | 744,640 |  |  |  | 7,447 |  |  |  | 2,161 |
Treasury investment shares |  |  | (472,963 | ) |  |  | (4,730 | ) |  |  | (1,370 | )
|  |  | 271,677 |  |  |  | 2,717 |  |  |  | 791 |

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