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Transactions in foreign currency (Details)
S/ in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
PEN (S/)
Dec. 31, 2015
PEN (S/)
Dec. 31, 2014
PEN (S/)
Assets            
Cash and cash equivalents | S/   S/ 49,216   S/ 80,215 S/ 158,007 S/ 580,499
Assets held for distribution | S/     338,411    
Total assets | S/   2,814,115   3,320,623 3,413,794  
Liabilities            
Trade and other payables | S/     (2,704)    
Liabilities held for distribution | S/     (2,704)    
Interest-bearing loans and borrowings | S/   (965,290)   (998,148)    
Total liability | S/   S/ (1,307,407)   S/ (1,340,594) S/ (1,367,660)  
USD            
Assets            
Cash and cash equivalents $ 1,157   $ 3,371      
Trade and other receivables 7,764   5,517      
Advances to suppliers for work in progress 5,534   2,733      
Assets held for distribution   1,885      
Total assets 14,455   13,506      
Liabilities            
Trade and other payables (18,274)   (15,224)      
Liabilities held for distribution     (379)      
Interest-bearing loans and borrowings (300,000)   (300,000)      
Total liability (318,274)   (315,603)      
Assets (liabilities) (303,819)   (302,097)      
Cross currency swap position 300,000   300,000      
Net monetary position $ (3,819)   $ (2,097)