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Corporate information (Details 4) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of subsidiaries [line items]        
Total assets S/ 2,814,115 S/ 3,320,623 S/ 3,413,794  
Liabilities 1,307,407 1,340,594 1,367,660  
Net equity 1,506,708 1,980,029 2,046,134 S/ 2,070,685
Net income (loss) 93,782 116,174 215,532  
Cementos Selva S.A. and subsidiaries [Member]        
Disclosure of subsidiaries [line items]        
Total assets 244,386 260,927    
Liabilities 34,969 36,477    
Net equity 209,417 224,450    
Net income (loss) 37,467 37,361 244,386  
Fosfatos del Pacifico S.A. [Member]        
Disclosure of subsidiaries [line items]        
Total assets 339,236    
Liabilities 3,495    
Net equity 335,741    
Net income (loss) (1,216) (9,010)  
Distribuidora Norte Pacasmayo S.R.L. [Member]        
Disclosure of subsidiaries [line items]        
Total assets 243,568 211,787    
Liabilities 119,182 87,182    
Net equity 124,386 124,605    
Net income (loss) (220) 11,242 243,568  
Empresa de Transmision Guadalupe S.A.C. [Member]        
Disclosure of subsidiaries [line items]        
Total assets 42,136 49,339    
Liabilities 1,397 724    
Net equity 40,739 48,615    
Net income (loss) 124 504 42,136  
Salmueras Sudamericanas S.A. [Member]        
Disclosure of subsidiaries [line items]        
Total assets 587 47,661    
Liabilities 382    
Net equity 587 47,279    
Net income (loss) (50,942) (2,300) 587  
Calizas del Norte S.A.C. [Member]        
Disclosure of subsidiaries [line items]        
Total assets 713 1,219    
Liabilities 7 409    
Net equity 706 810    
Net income (loss) S/ (121) S/ 407 S/ 713