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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)

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