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Earnings per share (EPS) (Details) - PEN (S/)
S/ / shares in Units, S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator      
Net profit from continuing operations attributable to ordinary equity holders of the Parent S/ 81,385 S/ 119,483 S/ 217,387
Net loss from discontinued operations attributable to ordinary equity holders of the Parent (754) (6,589) (5,720)
Net profit attributable to ordinary equity holders of the Parent S/ 80,631 S/ 112,894 S/ 211,667
Denominator      
Weighted average number of common and investment shares 446,062 544,687 573,998
Basic profit for common and investment shares from continuing operations S/ 0.21 S/ 0.22 S/ 0.39
Basic loss for common and investment shares from discontinued operations (0.01) (0.01)
Basic profit for common and investment shares from continuing and discontinued operations S/ 0.21 S/ 0.21 S/ 0.38