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Shareholders' Equity - Summary of Stock Option Activity (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Stockholders' Equity [Abstract] |  |  |
Outstanding shares, beginning balance | 8,290,251us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 16,690,472us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 26,453,152us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options forfeited, shares | (8,285,951)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod | (8,400,221)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod | (9,762,680)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Outstanding shares, ending balance | 4,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 8,290,251us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 16,690,472us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Stock option plans, Lower price range, Beginning Outstanding options | $ 16.73stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit | $ 16.73stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit | $ 16.73stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Stock option plans, Upper price range, Beginning Outstanding options | $ 27.21stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit | $ 27.21stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit | $ 33.70stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Options forfeited, Lower Range, Price Per Share | $ 16.73stm_StockOptionPlansOptionsForfeitedLowerRangePricePerShare | $ 16.73stm_StockOptionPlansOptionsForfeitedLowerRangePricePerShare | $ 17.08stm_StockOptionPlansOptionsForfeitedLowerRangePricePerShare
Options forfeited, Upper Range, Price Per Share | $ 27.21stm_StockOptionPlansOptionsForfeitedUpperRangePricePerShare | $ 27.21stm_StockOptionPlansOptionsForfeitedUpperRangePricePerShare | $ 33.70stm_StockOptionPlansOptionsForfeitedUpperRangePricePerShare
Stock option plans, Lower price range, Ending Outstanding options | $ 16.73stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit | $ 16.73stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit | $ 16.73stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Stock option plans, Upper price range, Ending Outstanding options | $ 16.73stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit | $ 27.21stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit | $ 27.21stm_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivativesShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Outstanding, Weighted Average Price Per Share, beginning | $ 22.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 21.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 24.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options forfeited, Weighted Average Price Per Share | $ 22.65us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice | $ 19.39us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice | $ 30.50us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Outstanding, Weighted Average Price Per Share, ending | $ 16.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 22.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 21.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

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- Definition Notional Amount Of Foreign Currency Cash Flow Hedge Derivatives Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit. + References No definition available. + Details
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- Definition Notional Amount Of Foreign Currency Cash Flow Hedge Derivatives Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit. + References No definition available. + Details
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- Definition Stock option plans, options forfeited, lower range, price per share. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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