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Financial risk management, objectives and policies (Details Narrative)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
PEN (S/)
Customer
Dec. 31, 2016
PEN (S/)
Customer
Dec. 31, 2015
PEN (S/)
Disclosure of financial assets [line items]      
Total financial instruments at fair value S/ 21,206 S/ 657 S/ 436
Description of market index impact  
A decrease of 10% on Lima stock exchange (BVL) market index could have an impact of approximately S/66,000 on the income or equity attributable to the Group, depending on whether or not the decline is significant or prolonged. An increase of 10% in the value of the listed securities would only impact equity but would not have an effect on profit or loss.
  
Revenue S/ 1,225,639 S/ 1,240,169 S/ 1,231,015
Customer 6 [Member] | Trade receivables [Member]      
Disclosure of financial assets [line items]      
Number of customer | Customer 6    
Revenue S/ 3,000    
Percentage of entity's 28.00%    
Customer 3 [Member] | Trade receivables [Member]      
Disclosure of financial assets [line items]      
Number of customer | Customer   3  
Revenue   S/ 3,000  
Percentage of entity's   21.00%  
Customer 25 [Member] | Trade receivables [Member]      
Disclosure of financial assets [line items]      
Number of customer | Customer 25    
Revenue S/ 700    
Percentage of entity's 61.00%    
Customer 27 [Member] | Trade receivables [Member]      
Disclosure of financial assets [line items]      
Number of customer | Customer   27  
Revenue   S/ 700  
Percentage of entity's   68.00%