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TAX SITUATION (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of tax situation [Abstract]      
Peruvian statutory income tax rate 29.50% 29.50% 28.00%
Increase (decrease) in the statutory tax rate due to:      
(i) Increase (decrease) arising from net income (loss) of subsidiaries not domiciled in Peru 0.09% (1.82%) (0.04%)
(ii) Non-taxable income, net (2.39%) (2.69%) (1.23%)
(iii)Effect of change in Peruvian tax rates 8211.00% 8211.00% (0.53%)
Effective income tax rate 27.20% 24.99% 26.20%