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v3.19.1

Shareholders' equity, net (Details Textual) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 15, 2017 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares S/ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 $ / shares S/ / shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2018 S/ / shares | Dec. 31, 2009 $ / shares | Jul. 11, 2003 $ / shares
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |
Trading frequency |  | 35.00% |  | 25.00% |  |  |  |  |
Par value per share | $ / shares |  |  |  |  |  |  |  | $ 2.83 | $ 0.54
Number of treasure shares purchased | shares |  |  |  |  |  | 200,000 |  |  |
Payments To Acquire Treasure Shares |  |  |  |  |  | $ 1,210,000 |  |  |
Increase in legal reserves |  | $ 44,000 |  | $ 327,000 |  | 30,000 |  |  |
Dividends declared to non controlling interest |  | $ 5,560,000 |  | $ 6,036,000 |  | $ 7,400,000 |  |  |
Total number of common and investment shares outstanding | shares |  | 253,986,867 |  | 253,986,867 |  | 253,986,867 |  |  |
Quoted price per equity share | $ / shares |  | $ 20.80 | $ 20.80 | $ 29.70 | $ 29.70 |  |  |  |
Dividend Declared |  | $ 200,000,000 |  |  |  |  |  |  |
Dividend Declared Per Share | $ / shares |  | $ 0.571337 |  |  |  |  |  |  |
Withholding Taxes Percentage |  | 4.10% |  |  |  |  |  |  |
Changes in tax rates or tax laws enacted or announced [member] |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |
Withholding tax rate, Percent | 5.00% |  |  |  |  |  |  |  |
Bottom of range [member] |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |
Other capital reserve, Percentage |  | 10.00% |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |
Other capital reserve, Percentage |  | 20.00% |  |  |  |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  | $ 605,000 |  |  |
Ordinary shares [member] |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |
Market price per share | S/ / shares |  |  | $ 53.60 |  | $ 45.00 |  |  |  |
Par value per share | S/ / shares |  |  |  |  |  |  | S/ 10.00 |  |
investment shares [Member] |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |
Market price per share | S/ / shares |  |  | $ 19.60 |  | $ 22.10 |  |  |  |
Par value per share | S/ / shares |  |  |  |  |  |  | S/ 10.00 |  |

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