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Corporate information (Details Narrative) - PEN (S/)
S/ in Thousands
 1 Months Ended 12 Months Ended
Mar. 01, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 13, 2017
Dec. 13, 2016
Aug. 02, 2016
Jul. 31, 2016
Feb. 29, 2016
Feb. 02, 2016
Dec. 31, 2015
Sep. 25, 2015
Jul. 14, 2015
Jun. 04, 2015
Disclosure of subsidiaries [line items]                            
Capital stock     S/ 423,868 S/ 531,461                    
Investment shares     40,279 50,503                    
Additional paid-in capital     432,779 545,165                    
Other reserves     (43,699) (16,602)                    
Non-controlling interest     148 112,589                    
Description of shares received upon spin-off  

The project contemplates that for each common and investment share of the Company, each shareholder will receive approximately 0.20 common and investment shares of Fossal S.A.A. and approximately 0.80 common and investment shares of Cementos Pacasmayo S.A.A. 

                        
Quimpac S.A. [Member]                            
Disclosure of subsidiaries [line items]                            
Capital stock     S/ 490 S/ 473             S/ 277      
Salmueras Sudamericanas S.A. [Member]                            
Disclosure of subsidiaries [line items]                            
Percentage of holding interests in subsidiary     25.10% 25.10%                    
Capital stock         S/ 3,467 S/ 783       S/ 4,100       S/ 2,400
Non-controlling interest     S/ 147 S/ 11,867                    
Salmueras Sudamericanas S.A. [Member] | Quimpac S.A. [Member]                            
Disclosure of subsidiaries [line items]                            
Percentage of holding interests in subsidiary     25.10%                      
Fosfatos del Pacifico S.A. [Member]                            
Disclosure of subsidiaries [line items]                            
Percentage of holding interests in subsidiary     30.00%                    
Decrease in capital stock S/ 107,593                          
Capital stock 107,593 S/ 1,200         S/ 13,384 S/ 1,000 S/ 23,216     S/ 15,813 S/ 78,178  
Investment shares 10,224                          
Additional paid-in capital 118,569                          
Other reserves 36,957                          
Non-controlling interest S/ 100,357   S/ 100,722                    
Inversiones ASPI S.A. [Member]                            
Disclosure of subsidiaries [line items]                            
Percentage of holding interests in subsidiary     50.01% 50.01%