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STOCKHOLDERS' EQUITY: (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 48 Months Ended | 84 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Nov. 30, 2014 | Oct. 31, 2014 | Sep. 30, 2014 | Aug. 31, 2014 | Jul. 31, 2014 | Jun. 30, 2014 | Mar. 21, 2014 | Jan. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2014 | Oct. 09, 2012 | Dec. 31, 2014 | Dec. 31, 2012
Loss Contingency, Information about Litigation Matters [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal fees related to SCC shareholder derivative lawsuit (Note 14) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 316,233,000 us-gaap_LitigationSettlementExpense |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  | 1,216,599,000 us-gaap_TreasuryStockValue |  |  |  |  |  |  |  |  |  | 1,216,599,000 us-gaap_TreasuryStockValue |
Purchase of shares | 87,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 38,000,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 168,000,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 141,400,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 158,100,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 23,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 13,000,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 2,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 49,600,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 293,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 323,400,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 13,000,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 52,500,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 281,400,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 147,300,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 730,800,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 1,842,300,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Balance at the end of the period | 1,900,686,000 us-gaap_TreasuryStockValue |  |  |  |  |  |  |  |  | 1,900,686,000 us-gaap_TreasuryStockValue |  |  |  | 1,216,599,000 us-gaap_TreasuryStockValue |  |  | 1,900,686,000 us-gaap_TreasuryStockValue |  | 1,900,686,000 us-gaap_TreasuryStockValue |
Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) | 71,977,964 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  |  | 71,977,964 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember |  |  |  | 49,278,536 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember |  |  | 71,977,964 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember |  | 71,977,964 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember |
Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) | 89,950,310 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  | 89,950,310 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember |  |  |  | 75,262,919 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember |  |  | 89,950,310 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember |  | 89,950,310 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember |
Americas Mining Corporation Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Information about Litigation Matters [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCC shareholder derivative lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,108,200,000 scco_CourtOrderSettlementPayment / dei_LegalEntityAxis = scco_AmericasMiningCorporationMember |  |
Legal fees related to SCC shareholder derivative lawsuit (Note 14) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 316,200,000 us-gaap_LitigationSettlementExpense / dei_LegalEntityAxis = scco_AmericasMiningCorporationMember |  |
Accural - Legal fees related to SCC shareholders dervative lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 316,200,000 us-gaap_LossContingencyAccrualAtCarryingValue / dei_LegalEntityAxis = scco_AmericasMiningCorporationMember |  |  |  |  | 316,200,000 us-gaap_LossContingencyAccrualAtCarryingValue / dei_LegalEntityAxis = scco_AmericasMiningCorporationMember
TREASURY STOCK: | Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  | 1,011,000,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 729,800,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 1,011,000,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Purchase of shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 281,400,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 682,800,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Used for corporate purposes |  |  |  |  |  |  |  |  |  |  |  |  |  | (200,000)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | (300,000)us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Balance at the end of the period | 1,693,500,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  | 1,693,500,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 1,011,000,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | 1,693,500,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | 1,693,500,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  |  |  | 205,600,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 189,000,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 205,600,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Other activity, including dividend, interest and currency translation effect |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,600,000 scco_TreasuryStockValueOtherActivityIncludingDividendInterestAndCurrencyTranslationEffect / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 1,600,000 scco_TreasuryStockValueOtherActivityIncludingDividendInterestAndCurrencyTranslationEffect / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Balance at the end of the period | 207,200,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  | 207,200,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 205,600,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | 207,200,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | 207,200,000 us-gaap_TreasuryStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_ParentCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
ADDITIONAL PAID-IN CAPITAL: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Information about Litigation Matters [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCC shareholder derivative lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,108,221,000)scco_CourtOrderSettlementPayment / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | $ (2,108,200,000)scco_CourtOrderSettlementPayment / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember

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