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Deferred income tax assets and liabilities, net (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
Effect on profit or loss S/ 11,129 S/ (30,226)  
Effect on OCI 11,339 11,039 S/ (4,019)
Discontinued operations 551 6,399 3,141
Provision For Vacations [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 72 355  
Effect on profit or loss 16 (116)  
Effect on OCI  
Discontinued operations (167)  
As of December 31, 2016 88 72 355
Effect Of Differences Between Book And Tax Bases Of Fixed Assets And In The Depreciation Rates Used For Book Purposes [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 2 (467)  
Effect on profit or loss 34 14  
Effect on OCI  
Discontinued operations 455  
As of December 31, 2016 36 2 (467)
Other [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 36 62  
Effect on profit or loss (18) 10  
Effect on OCI  
Discontinued operations (36)  
As of December 31, 2016 18 36 62
Tax-Loss Carry Forward [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 4,953 21,127  
Effect on profit or loss (4,953) 301  
Effect on OCI  
Discontinued operations (16,475)  
As of December 31, 2016 4,953 21,127
Pre-Operating Costs [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 1,287  
Effect on profit or loss (1,287) 1,287  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 1,287
Total Deferred Income Tax Assets, Net [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 6,350 21,077  
Effect on profit or loss (6,208) 1,496  
Effect on OCI  
Discontinued operations (16,223)  
As of December 31, 2016 142 6,350 21,077
Impairment Of Zinc Mining Assets [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 28,318 24,986  
Effect on profit or loss 3,332  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 28,318 28,318 24,986
Impairment on Brine Project Assets [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015  
Effect on profit or loss 17,087  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 17,087
Long-Term Incentive Plan [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 10,138 10,334  
Effect on profit or loss (1,194) (196)  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 8,944 10,138 10,334
Provision For Vacations [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 3,669 4,051  
Effect on profit or loss 157 (382)  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 3,826 3,669 4,051
Available For Sale Financial Investment From Spin-Off [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015  
Effect on profit or loss  
Effect on OCI  
Discontinued operations 2,253  
As of December 31, 2016 2,253
Discounts On Trade Receivables [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015  
Effect on profit or loss 1,093  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 1,093
Other [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 3,779 5,795  
Effect on profit or loss 1,849 (2,016)  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 5,628 3,779 5,795
Deferred Income Tax Assets [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 45,904 45,166  
Effect on profit or loss 18,992 738  
Effect on OCI  
Discontinued operations 2,253  
As of December 31, 2016 67,149 45,904 45,166
Effect Of Differences Between Book And Tax Bases Of Fixed Assets And In The Depreciation Rates Used For Book Purposes [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 (157,636) (124,157)  
Effect on profit or loss (11,332) (33,479)  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 (168,968) (157,636) (124,157)
Effect Of Costs Of Issuance Of Senior Notes [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 (2,906) (3,218)  
Effect on profit or loss 484 312  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 (2,422) (2,906) (3,218)
Net Gain On Cash Flow Hedge [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 (20,624) (32,439)  
Effect on profit or loss 9,203 711  
Effect on OCI 11,277 11,104  
Discontinued operations  
As of December 31, 2016 (144) (20,624) (32,439)
Effect Of Available-For-Sale Investments [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 (62) 3  
Effect on profit or loss  
Effect on OCI 62 (65)  
Discontinued operations  
As of December 31, 2016 (62) 3
Other [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 (4,428) (4,424)  
Effect on profit or loss (10) (4)  
Effect on OCI  
Discontinued operations  
As of December 31, 2016 (4,438) (4,428) (4,424)
Deferred Income Tax Liabilities [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 (185,656) (164,235)  
Effect on profit or loss (1,655) (32,460)  
Effect on OCI 11,339 11,039  
Discontinued operations  
As of December 31, 2016 (175,972) (185,656) (164,235)
Total Deferred Income Tax Liabilities, Net [Member]      
Reconciliation of changes in deferred tax liability (asset) [RollForward]      
As of January 01, 2015 (139,752) (119,069)  
Effect on profit or loss 17,337 (31,722)  
Effect on OCI 11,339 11,039  
Discontinued operations 2,253  
As of December 31, 2016 S/ (108,823) S/ (139,752) S/ (119,069)