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EQUITY (Details Textual)
S/ / shares in Units, $ / shares in Units, S/ in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 27, 2019
PEN (S/)
S/ / shares
Feb. 28, 2018
PEN (S/)
Feb. 22, 2017
PEN (S/)
Feb. 24, 2016
PEN (S/)
Dec. 31, 2018
PEN (S/)
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
PEN (S/)
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
PEN (S/)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Oct. 25, 2017
PEN (S/)
Oct. 25, 2017
USD ($)
Dec. 31, 2016
$ / shares
Disclosure of equity [Line Items]                              
Number of shares issued | shares         94,382,317   94,382,317   94,382,317            
Par value per share | $ / shares                     $ 5 $ 5     $ 5
Purchase of treasury shares         S/ (95,413) $ 29.3 S/ (71,008) $ 21.9 S/ (66,528) $ 20.0          
Description of significant restrictions on entity's statutory reserve         required to keep a reserve that equals a percentage of paid-in capital (20, 30 or 50 percent, depending on its activities and the country in which production takes place); this reserve must be constituted with annual transfers of not less than 10 percent of net profits required to keep a reserve that equals a percentage of paid-in capital (20, 30 or 50 percent, depending on its activities and the country in which production takes place); this reserve must be constituted with annual transfers of not less than 10 percent of net profits                  
Statutory reserve         S/ 5,179,000   4,480,300   3,987,500            
Increase (decrease) through transfer to statutory reserve, equity   S/ 2,933,600 S/ 2,355,000 S/ 2,316,400                      
Dividends paid, classified as financing activities         S/ 1,130,427 $ 343.5 S/ 979,989 $ 298.1 S/ 653,326 $ 184.7          
Dividends paid, ordinary shares per share | $ / shares           $ 4.3   $ 3.7   $ 2.3          
Withholding tax rate         5.00% 5.00% 5.00% 5.00% 6.80% 6.80%          
Capital commitments         S/ 25,063,900   S/ 21,723,000                
Increase of capital requirement         S/ 4,658,100   S/ 3,710,300                
Interim dividend payable                         S/ 1,252,300 $ 386.5  
Date of dividend paid             November 2017 November 2017              
Non adjusting Event Member [Member]                              
Disclosure of equity [Line Items]                              
Dividends paid, classified as financing activities S/ 1,887,600                            
Dividends recognised as distributions to owners per share | S/ / shares S/ 20.00                            
Date on which dividend will be paid May 10, 2019                            
Group [Member]                              
Disclosure of equity [Line Items]                              
Purchase of number of treasury shares | shares         133,750 133,750 132,110 132,110 156,603 156,603