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Shareholders’ equity, net (Details Textual)		12 Months Ended
	Jan. 15, 2017	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares S/ / shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares S/ / shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2017 S/ / shares	Dec. 31, 2009 $ / shares	Jul. 11, 2003 $ / shares
Disclosure of Shareholders’ equity, net [Line Items]
Trading frequency		25.00%		10.00%
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
Percentage of earnings to be transferred to legal reserves		10.00%
Legal reserves to be maintained as a percentage of capital stock		20.00%
Increase in legal reserves		$ 327,000		30,000
Dividends declared to non controlling interest		$ 6,036,000		$ 7,400,000		$ 10,488,000
Total number of common and investment shares outstanding | shares		253,986,867		253,986,867		254,186,867
Weighted average number of ordinary shares outstanding | shares		253,986,867		253,986,867		254,186,867
Quoted price per equity share | $ / shares		$ 29.70	$ 29.70	$ 19.11	$ 19.11
Changes in tax rates or tax laws enacted or announced [member]
Disclosure of Shareholders’ equity, net [Line Items]
Withholding tax rate, Percent	5.00%			6.80%
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	$ 605,000
Ordinary shares [member]
Disclosure of Shareholders’ equity, net [Line Items]
Market price per share | S/ / shares			$ 45.00		$ 34.37
Par value per share | $ / shares		$ 10.00	$ 10.00
investment shares [Member]
Disclosure of Shareholders’ equity, net [Line Items]
Market price per share | S/ / shares			$ 22.10		$ 25.00
Par value per share | S/ / shares							S/ 10.00

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