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Provisions (Details Narrative) - PEN (S/)
S/ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of other provisions [line items]      
Other provisions S/ 52,868 S/ 53,753 S/ 61,518
Worker' Profit-Sharing [Member]      
Disclosure of other provisions [line items]      
Percentage of distributions based on number of days working in preceding year 50.00%    
Percentage of proportionate annual salary levels 50.00%    
Other provisions S/ 20,147 17,018 21,273
Worker' Profit-Sharing [Member] | Bottom of Range [Member]      
Disclosure of other provisions [line items]      
Percentage of employee profit sharing plan 8.00%    
Worker' Profit-Sharing [Member] | Top of Range [Member]      
Disclosure of other provisions [line items]      
Percentage of employee profit sharing plan 10.00%    
Long-term Incentive Plan [Member]      
Disclosure of other provisions [line items]      
Other provisions S/ 30,322 34,368 36,906
Rehabilitation Provision [Member]      
Disclosure of other provisions [line items]      
Other provisions S/ 2,399 S/ 2,367 S/ 3,339
Rehabilitation Provision [Member] | Bottom of Range [Member]      
Disclosure of other provisions [line items]      
Percentage of present value of provision 6.52%    
Rehabilitation Provision [Member] | Top of Range [Member]      
Disclosure of other provisions [line items]      
Percentage of present value of provision 7.65%