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Provisions (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of changes in other provisions [Roll Forward]      
Balance at beginning S/ 53,753 S/ 61,518  
Additions, notes 21 and 25 32,955 36,268  
Change in estimates, note 22 522 5,259  
Unwinding of discount, note 24 (522) (345) S/ (788)
Payments and advances (34,362) (49,637)  
Balance at end 52,868 53,753 61,518
Current portion 24,575 31,711  
Non-current portion 28,293 22,042  
Provisions 52,868 53,753  
Worker' Profit-Sharing [Member]      
Reconciliation of changes in other provisions [Roll Forward]      
Balance at beginning 17,018 21,273  
Additions, notes 21 and 25 21,554 18,692  
Change in estimates, note 22    
Payments and advances (18,425) (22,947)  
Balance at end 20,147 17,018 21,273
Current portion 20,147 17,018  
Non-current portion    
Provisions 20,147 17,018  
Long-term Incentive Plan [Member]      
Reconciliation of changes in other provisions [Roll Forward]      
Balance at beginning 34,368 36,906  
Additions, notes 21 and 25 11,401 16,088  
Change in estimates, note 22 477    
Unwinding of discount, note 24   345  
Payments and advances (15,924) (18,971)  
Balance at end 30,322 34,368 36,906
Current portion 4,200 13,817  
Non-current portion 26,122 20,551  
Provisions 30,322 34,368  
Rehabilitation Provision [Member]      
Reconciliation of changes in other provisions [Roll Forward]      
Balance at beginning 2,367 3,339  
Additions, notes 21 and 25 1,488  
Change in estimates, note 22 45 5,259  
Payments and advances (13) (7,719)  
Balance at end 2,399 2,367 S/ 3,339
Current portion 228 876  
Non-current portion 2,171 1,491  
Provisions S/ 2,399 S/ 2,367