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STOCKHOLDERS' EQUITY: (Details 4) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Mar. 31, 2015 Employee Stock Purchase 2007 Plan USD ($) | Mar. 31, 2014 Employee Stock Purchase 2007 Plan USD ($) | Mar. 31, 2015 Employee Stock Purchase 2010 Plan USD ($) | Mar. 31, 2014 Employee Stock Purchase 2010 Plan USD ($) | Dec. 31, 2010 Employee Stock Purchase 2010 Plan USD ($) | Dec. 31, 2010 Employee Stock Purchase 2010 Plan MXN | Mar. 31, 2015 Employee Stock Purchase 2015 Plan USD ($) | Mar. 31, 2015 Employee Stock Purchase 2015 Plan MXN
Information related to compensation cost |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 0.5 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | $ 0.1 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember | $ 0.1 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember |  |  |  |
Unrecognized compensation expense |  | $ 1.6 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | $ 2.0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember | $ 2.5 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember |  |  |  |
Period over which unrecognized compensation expense expected to be recognized |  |  |  | 3 years 9 months |  |  |  |
Stock award activity, Shares |  |  |  |  |  |  |  |
Outstanding shares at the beginning of the period | 4,298,612 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOutstandingNumber / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | 4,449,599 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOutstandingNumber / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | 2,287,891 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOutstandingNumber / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember | 3,012,464 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOutstandingNumber / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember |  |  |  |
Exercised (in shares) |  | (40,632)scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsExercisesInPeriod / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember |  | (249,446)scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsExercisesInPeriod / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember |  |  |  |
Forfeited (in shares) | (3,660,945)scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsForfeituresInPeriod / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember |  |  |  |  |  |  |
Outstanding shares at the end of the period | 637,667 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOutstandingNumber / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | 4,408,967 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOutstandingNumber / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | 2,287,891 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOutstandingNumber / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember | 2,763,018 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOutstandingNumber / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember |  |  |  |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) | $ 1.16 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | $ 1.16 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | $ 2.05 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember | $ 2.05 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember |  |  |  |
Exercised (in dollars per share) |  | $ 1.16 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsExercisesInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember |  | $ 2.05 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsExercisesInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember |  |  |  |
Forfeited (in dollars per share) | $ 1.16 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsForfeituresInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember |  |  |  |  |  |  |
Outstanding shares at the end of the period (in dollars per share) | $ 1.16 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | $ 1.16 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2007PlanMember | $ 2.05 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember | $ 2.05 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardsWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember |  |  |  |
Purchase price for initial subscription (in dollars per share) |  |  |  |  | $ 2.05 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceForInitialSubscription / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember | 26.51 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceForInitialSubscription / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2010PlanMember | $ 2.63 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceForInitialSubscription / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2015PlanMember | 38.44 scco_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceForInitialSubscription / us-gaap_PlanNameAxis = scco_EmployeeStockPurchase2015PlanMember

X
- Definition Represents the purchase price of shares for the initial subscription as a part of share based compensation award plan. + References No definition available. + Details
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- Definition Represents the number of equity awards exercised during the period. + References No definition available. + Details
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- Definition Represents the weighted average grant-date fair value of equity awards exercised during the period. + References No definition available. + Details
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- Definition Represents the number of equity awards cancelled during the period as a result of occurrence of a terminating event specified in contractual agreements pertaining to equity based compensation plan. + References No definition available. + Details
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- Definition Represents the weighted average grant-date fair value of equity awards forfeited during the period. + References No definition available. + Details
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- Definition Represents the number of equity awards outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the weighted average grant-date fair value of equity awards outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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